Abstract: Method of allocating communication codes to channels set up in respect of mobile terminals in communication in a cell of a radiocommunication system, in which the cell is served by a fixed station having means of adjustment of send/receive parameters defining a respective antenna pattern in respect of each mobile terminal in the cell, in which the allocated communication codes form part of a set of codes some at least of which are mutually orthogonal. In response to channel setup or reconfiguration request in respect of a first mobile terminal in the cell, the allocation to the said channel of a code nonorthogonal to at least one code of the set already allocated to another channel set up in respect of a second mobile terminal in the cell is conditionally admitted, as a function of a comparison between the send/receive parameters determined in respect of the first and second terminals.

Abstract: A device and method for generating a binary quasi-orthogonal code in a CDMA communication system. The method comprises generating an m-sequence, and specific left and right sequences having a good full correlation property with the m-sequence; column permuting the specific left and right sequences in a column permutation method used when converting the m-sequence to a Walsh orthogonal code, and connecting the left sequences to the right sequences to generate mask candidates; operating the mask candidates and Walsh orthogonal codes having the same length as the mask candidates to generate quasi-orthogonal code candidate families; and selecting a quasi-orthogonal code out of the generated quasi-orthogonal code candidate families, the selected quasi-orthogonal code satisfying a partial correlation property with the Walsh orthogonal codes, and selecting a mask related to generation of the selected quasi-orthogonal code.

Abstract: Disclosed is a method for performing fast distributed sample acquisition (DSA). A spreader generates a data signal by spreading an incoming data stream over a range of spectrum according to a locally generated first main sequence, and samples the state sample of the main sequence. A sample spreader outputs a first state signal by spreading a symbol according to a locally generated first subsequence. A sample despreader reconstructs the transmitted binary orthogonal symbols by despreading the first state signal obtained from the sample spreader according to a locally generated second subsequence to detect the first main sequence state sample. A despreader compares the state sample obtained from the sample despreader with a locally generated state sample and makes correction on a local SRG to generate a second main sequence having new state. An incoming data stream is reconstructed by despreading the data signal obtained from the spreader according to the second main sequence.

Abstract: A direct sequence spread spectrum system in which a plurality of substantially redundant second blocks are derived from a first block of data. Each of the second blocks is spread using a distinct spreading sequence, and one or more signals representing each of the spread blocks is modulated and transmitted over a wireless interface. The transmitted one or more signals are received, and estimates of one or more of the second blocks derived therefrom. The first block is then estimated from one or more of the estimated second blocks.

Abstract: Dynamic Time Metered Delivery (DTMD) is a unique physical layer communication Method. DTMD uses enhanced time-based techniques to enable and control the flow of more data/Hertz through a variety of transmission media including existing and new copper phone lines, coaxial cable, fiber optic, powerline and wireless RF, Optical and Acoustic, to and from a comprehensive, multi-function customer data gateway. The system measures the transmission parameters as viewed from the “end of the line” and then sends these numerics back to the source which alters the shape of the basic signal structure such that when received at the far end, it will have maximum recognition attributes against interferers and noise. The present system and method add the adaptivity to the line conditions and set a maximum allowable data rate within the subscribed levels of performance.

Abstract: Nonlinear dynamic systems for generating and acquiring a spread spectrum signal pseudo-random noise (PN) signal are disclosed. An actuating signal is delayed by a first and second period to produce delayed actuating signals. A continuous, nonlinear function is applied to input that corresponds to the delayed actuating signals to produce an output signal. The function has values that correspond to the binary integer values of the mod 2 addition function of a linear feedback shift register, and a non-zero slope at those values. The output signal becomes a PN signal over time when it is fed back to the actuating signal. The output signal synchronizes with a spread spectrum reference input signal when it is superposed on the reference input signal to produce the actuating signal. The system may be incorporated into a transmitter or a receiver, either of which may be part of a larger communication system.

Abstract: A base station including a transmitting and receiving amplifier for amplifying CDMA signals exchanged with a mobile station; a radio stage connected to the transmitting and receiving amplifier for carrying out D/A conversion of a transmitted signal that undergoes baseband spreading, followed by quadrature modulation, and for carrying out quasi-coherent detection of a received signal, followed by A/D conversion; a baseband signal processor connected with the radio stage for carrying out baseband signal processing of the transmitted signal and the received signal; a transmission interface connected with the baseband signal processor for implementing interface with external channels; and a base station controller for carrying out control such as management of radio channels and establishment and release of the radio channels. The base station communicates with the external channels by mapping logical channels into physical channels. The CDMA signals are spread using a short code and a long code.

Abstract: A base station transmits access control signals on a periodic basis having a first transmission rate. The base station transmits access control modification signals at a second transmission rate higher than the first transmission rate. The user equipment transmits an access attempt signal. The access attempt signal requests the base station to permit the user equipment access to the random access channel. The user equipment receives the transmitted access control signals and access modification signals. A wait period is determined based on in part the received access control signals and access control modification signals. In response to an unsuccessful access attempt, the user equipment delays transmitting a subsequent access attempt signal for the wait period.

Abstract: An improvement to a code-division-multiple-access (CDMA) system employing spread-spectrum modulation, with the CDMA system having a base station (BS) and a plurality of remote stations. The base station has a BS-spread-spectrum transmitter and a BS-spread-spectrum receiver. A remote station has an RS-spread-spectrum transmitter and an RS-spread-spectrum receiver. The BS transmitter transmits a broadcast common-synchronization channel, which includes a frame-timing signal. The broadcast common-synchronization channel has a common chip-sequence signal, which is common to the plurality of remote stations. In response to the RS-spread-spectrum receiver receiving the broadcast common-synchronization channel, and determining frame timing from the frame-timing signal, an RS-spread-spectrum transmitter transmits an access-burst signal. The BS-spread-spectrum transmitter, responsive to the BS-spread-spectrum receiver receiving the access-burst signal, transmits an acknowledgment signal.

Abstract: An ultrasonic coding modem for digital network communication comprises a transmitting device having a first piezoelectric substrate, and a receiving device having a second piezoelectric substrate. If a message digital-signal is applied to the transmitting device, a SAW is excited on the first piezoelectric substrate and is delivered as a coded digital signal into a digital network. On the other hand, if the coded digital-signal is received at the receiving device from the digital network, a SAW is excited on the second piezoelectric substrate. In this time, if the SAW excited on the second piezoelectric substrate is corresponding to the SAW excited on the first piezoelectric substrate, an output digital-signal, which is equivalent to the message digital-signal, is delivered from the receiving device. As a result, it is possible to keep a base-band communication secret.

Abstract: In a CDMA transmitting apparatus, a cross-correlation value between different spreading-code sequences used to spread respective ones of a plurality of transmit signals is calculated, an interference interval of a spreading-code sequence is discriminated from the cross-correlation value calculated, and interference noise is reduced by halting transmission of at least one transmit signal, or partially altering at least one spreading-code sequence, with regard to all or part of a spreading-code sequence discriminated to be an interference interval.

Abstract: An apparatus and method for providing variable-length correlation for spread-spectrum communications includes a derotator, a variable-length correlator in signal communication with the derotator, a phase detector in signal communication with the variable-length correlator, a lock detector in signal communication with the phase detector, and a controller in signal communication with the lock detector for controlling the length of the variable-length correlator; where the corresponding method to track out large frequency offsets in spread-spectrum communications includes receiving signal chips, correlating the received signal chips, computing a loop error in accordance with the correlation, setting a new lock status in accordance with the computed loop error and a previous lock status, and setting a new correlator length in accordance with the new lock status and a previous correlator length.

Abstract: The present invention, relevant to a procedure for modulating/demodulating with code-select/code-division multiple access, provides a technique of code-division multiple-access, in which information channels in number of N+1 are assigned to each of blocks that includes a unit of orthogonal signature pattern codes in number of 2N, which are generated to maintain orthogonality between information channels transferred. One of the orthogonal codes of 2N belonging to the block is selected as a digital bit value of N-numbered information channels among the assigned information channels, and the other digital bit value of the information channel is set by modulating data channels of N+1 after being multiplied by the selected orthogonal code. Therefore, it reduces the number of orthogonal codes to be transferred rather than the number of information channels, lessening mutual interferences between crowded users and downing a cost for fabricating a system.

Abstract: A spread-spectrum communication apparatus includes an analog modulator and demodulator for modulating and demodulating information in its transmitter and receiver respectively. The apparatus also includes a spreader and de-spreader for modulating and demodulating a spread-spectrum signal respectively in its transmitter and receiver. This structure widens a dynamic range of the RSSI with an inexpensive and simple circuit. This structure also allows the apparatus to operate in a stable manner against an intense input signal, to detect an “out of sync” in a highly reliable manner and move immediately to a “sync-tracking mode”.

Abstract: The present invention provides methods and apparatus for controlling power utilization in a wireless communication receiver. A representative system comprises a signal properties evaluation module, an analog to digital converter (ADC), and an analog to digital converter control module. The signal properties evaluation module evaluates the stability of a received signal, and provides an indication of the stability. The ADC control module responds to the signal properties evaluation module to select the precision of the ADC based upon the indication of the stability. The ADC has at least two modes of operation, comprising a first precision and a second precision, and is responsive to the signal properties evaluation module to operate in at least one of two modes based upon the stability. The ADC responds to the signal properties evaluation module so as to limit the amount of power consumed by the wireless communications device.

Abstract: The present invention is an apparatus for reducing transmission errors by a user equipment (UE) when transmitting a communication signal. An RF communication signal is received at the UE and analyzed for errors. A correction signal is then generated based upon the analysis. Prior to transmission of the communication signal from the UE, the communication signal is corrected using the correction signal.

Abstract: A clock signal desired to be transmitted to various components of the electronic system is combined with a noise signal to generate a spread spectrum clock signal which, in turn, is distributed with an associated reference signal to selected components of the system using two-channel communication links. A receiving circuit within each of the selected components recovers the original clock signal from the spread spectrum clock signal and its associated reference signal. In one embodiment, the clock signal is combined with the noise signal in an exclusive-OR logic gate to generate a spread spectrum clock signal which is distributed to receiving components using a first channel. The noise signal is transmitted as the reference signal using the second channel. The two channel signals are combined in an exclusive-OR gate of one or more receiving circuits to recover the clock signal.

Abstract: A common dual-mode physical layer architecture for a communications receiver is capable of receiving either frequency hopping spread spectrum signals or direct sequence spread spectrum signals. A delta-sigma modulator is configured as an oversampling A/D converter with predetermined quantization noise shaping characteristics. The respective spread spectrum signal is processed by the delta-sigma modulator and then filtered via a decimation filter such as a (sin(x))/x filter to generate a quadrature signal having sufficient resolution to meet industry standards.

Abstract: The invention provides a spread-spectrum transmission system with multiple carrier modulation in which the signals for transmission over each of the subcarriers are filtered prior to being transmitted over the subcarrier, thereby making it possible on reception to synchronize the various subcarriers in time, and in which each subcarrier carries a plurality of chips that result from spreading a single symbol. With coherent modulation, the number of chips resulting from spreading a single symbol and transmitted over each subcarrier is selected so as to enable the various subcarriers to be put into phase alignment by recombining the chips coming from the same symbol on each subcarrier. With differential modulation, the transmission over each subcarrier of chips resulting from spreading a single symbol provides resistance to jamming by limiting recombination losses because of the differential modulation.

Abstract: Ending of a sleeping period is managed by, for one portion thereof, first clock signals being counted by a first clocking section, and for a remaining portion thereof, second clock signals being counted by a second clocking section. At this time, a count number by which the first clock signals are counted and a count number by which the second clock signals are counted are corrected on the basis of changes of a center of gravity in a distribution of timings of a plurality of paths.

Abstract: Techniques for puncturing symbols in a communications system are disclosed. S symbols are received for a frame having a capacity of N symbols, with S being greater than N. P symbols need to be punctured so that remaining symbols fit into the frame. A number of puncture distances, D1 through DN, are computed based on S and P. A particular number of symbol punctures is determined for each computed puncture distance. P1 through PN symbol punctures are then performed at the distances of D1 through DN, respectively. For a more even distribution of the symbol punctures, each of the distances D1 through DN can be selected to be greater than or equal to a minimum puncture distance Dmin defined as Dmin=└S/P┘, where └ ┘ denotes a floor operator. The symbol punctures at each computed distance can be performed together or distributed with symbol punctures at other distances.

Abstract: A method and system is disclosed for spreading the power associated with digital signals being transmitted to lower electromagnetic interference (EMI) emissions. After being transmitted across a transmission line, a representation of the original digital signal is recovered and provided to a destination device.

Abstract: Disclosed is a method for performing fast distributed sample acquisition (DSA). A spreader generates a data signal by spreading an incoming data stream over a range of spectrum according to a locally generated first main sequence, and samples the state sample of the main sequence. A sample spreader outputs a first state signal by spreading a symbol according to a locally generated first subsequence. A sample despreader reconstructs the transmitted binary orthogonal symbols by despreading the first state signal obtained from the sample spreader according to a locally generated second subsequence to detect the first main sequence state sample. A despreader compares the state sample obtained from the sample despreader with a locally generated state sample and makes correction on a local SRG to generate a second main sequence having new state. An incoming data stream is reconstructed by despreading the data signal obtained from the spreader according to the second main sequence.

Abstract: A spread spectrum position location communication system determines the position of a mobile master radio using a round-trip messaging scheme in which the time of arrive (TOA) of ranging messages is accurately determined to yield the range estimates required to calculate the position of the mobile radio via trilateration. The master radio transmits outbound ranging messages to plural reference radios which respond by transmitting reply ranging messages. Upon reception of the reply ranging message, the master radio determines the range to the reference radio from the signal propagation time calculated by subtracting the far-end turn around time from the round-trip elapsed time. Any combination of fixed or mobile radios of known positions can be used as the reference radios for another mobile radio in the system, thereby providing adaptability under varying transmission conditions.

Abstract: An improvement to a code-division-multiple-access (CDMA) system employing spread-spectrum modulation, with the CDMA system having a base station (BS) and a plurality of remote stations. The base station has a BS-spread-spectrum transmitter and a BS-spread-spectrum receiver. A remote station has an RS-spread-spectrum transmitter and an RS-spread-spectrum receiver. The BS transmitter transmits a broadcast common-synchronization channel, which includes a frame-timing signal. The broadcast common-synchronization channel has a common chip-sequence signal, which is common to the plurality of remote stations. In response to the RS-spread-spectrum receiver receiving the broadcast common-synchronization channel, and determining frame timing from the frame-timing signal, an RS-spread-spectrum transmitter transmits an access-burst signal. The access-burst signal includes a collision-detection portion.

Abstract: The invention is a CDMA system which achieves improved performance by virtue of being adaptive to the speed of each mobile unit in the system. A speed estimator for each mobile unit can be located in the mobile unit itself and/or in the base station. The speed estimate is used to modify a variety of parameters within processing fingers in the mobile unit and in the base station, including the accumulation period of certain accumulators and the time constant for loop filters. The speed estimate also influences assignment, by a control unit, of path delays to respective processing fingers for despreading. Furthermore, the speed estimate is used by the control unit to decide whether or not finger outputs are to be combined by a diversity combiner in the receiver. In addition, the speed estimate is used to optimize the closed-loop power control target and the energy of a transmitted pilot.

Abstract: The present invention relates to a transmit diversity antenna system employing active antenna electronics (with both receive and transmit amplifiers distributed among the elements of the antenna), polarization diversity on receive, and polarity diversity along with time delay diversity on transmit. The combination of these three techniques, in wireless communications applications, improves the efficiency and performance of both the transmitted and received signals at a base station, as well as the received signal at the mobile. In practice the present invention enables a substantially “balanced link” to exist between the base station and a mobile.

Abstract: A spread spectrum noise shaper uses a modulation technique to achieve a greater signal-to-noise or signal-to-interference ratio (SNR or SIR). The technique doubles the system SIR, in principle. This doubling yields a doubling in system capacity. SNR is increased by receiving the spread spectrum signal in the presence of less noise near the edge of the spread spectrum bandwidth. The technique requires only small additions to a conventional spread spectrum system, in the form of an extra modulator at the transmitter, and an extra demodulator and filter at the receiver.

Abstract: The invention provides a spread-spectrum transmission system with multiple carrier modulation in which the signals for transmission over each of the subcarriers are filtered prior to being transmitted over the subcarrier, thereby making it possible on reception to synchronize the various subcarriers in time, and in which each subcarrier carries a plurality of chips that result from spreading a single symbol. With coherent modulation, the number of chips resulting from spreading a single symbol and transmitted over each subcarrier is selected so as to enable the various subcarriers to be put into phase alignment by recombining the chips coming from the same symbol on each subcarrier. With differential modulation, the transmission over each subcarrier of chips resulting from spreading a single symbol provides resistance to jamming by limiting recombination losses because of the differential modulation.

Abstract: A square root raised cosine filter for a mobile transceiver may be adapted to operate with a variety of potential chip rates such as the four chip rates associated with IMT-2000 standard. The signal produced by the filter may be adjusted based on a variety of potential chip rates. One of the adjusted filter signals may be selected as the resulting filter output, depending on the particular chip rate selected for the mobile transceiver.

Abstract: A hybrid DSMA-CR/CDMA methodology provides efficient access to one of a group of common packet channels in a cell of a spread spectrum wireless communication network. The base station broadcasts status information as to the availability and/or available data rates for each common packet channel (CPCH) or group of CPCH channels. Each mobile station uses the status information to select an available channel and/or a channel with sufficient data rate. The mobile station then starts transmission of a series of access preambles, each of which contains a signature corresponding to the selected channel. The mobile station transmits the preambles at increasing power levels. When the base station detects a preamble transmission, the base station responds with a corresponding acknowledgment. Upon receiving this acknowledgment, the mobile station preferably selects a collision detection (CD) signature and transmits a CD preamble containing that signature.

Abstract: The contents of a counter at a remote station is used to select a Walsh cover, which is used to cover the acknowledgment or negative acknowledgment bits sent on a new reverse acknowledgment channel (R-ACKCH). In the new reverse acknowledgment channel, the value of the acknowledgment bits for the broadcast transmissions is used to select the Walsh code sequence that covers the acknowledgment bit for the dedicated transmissions. When a base station receives an acknowledgment message from the remote station, the base station checks the Walsh cover of the message and extracts the embedded counter content. If the embedded counter content of the received acknowledgment or negative acknowledgment differs from the local counter value, the base station determines that a synchronization problem occurred, such that the remote station is not operating with the current transmission format information. Hence, the counter values act as the sequence identifiers of the Walsh masks.

Abstract: A base station (BS) and a plurality of remote stations in a code-division-multiple access (CDMA) system employ spread-spectrum communication. The base station has a BS-spread-spectrum transmitter and a BS-spread-spectrum receiver. A remote station has an RS-spread-spectrum transmitter and an RS-spread-spectrum receiver. The BS transmitter transmits a broadcast common-synchronization channel, which includes a frame-timing signal. The broadcast common-synchronization channel uses a common chip-sequence signal. An RS-spread-spectrum receiver receives the broadcast common-synchronization channel, and the RS determines frame timing from the frame-timing signal. In response, the associated RS-spread-spectrum transmitter transmits an access burst signal, including RS-preamble signals, RS-power-control signals, and RS-pilot signals, respectively, transmitted in time, at increasing power levels.

Abstract: A circuit is designed with a plurality of logic circuits (370-374) for producing an offset state matrix. The circuit includes a first logic circuit (380-383) coupled to receive N elements of a respective row of a transition matrix and N elements of column of an input state matrix. The first logic circuit produces a multi-bit logical combination of corresponding bits of the respective row and the column. A second logic circuit (390) is coupled to receive the multi-bit logical combination and produces a respective element of the offset state matrix.

Abstract: Method for transmitting a word representative of transmission parameters respectively allocated to the mobile stations in communication with a base station of a mobile telecommunication system, wherein it includes the step of: including, in each transmission burst a midamble resulting from the sum of selected midambles among all the available midambles, said selection being done by said base station in relation with a word so that a selected midamble corresponds to a binary element of said word equal to a first value and a non-selected midamble corresponds to a binary element of said word equal to a second value, and considering a word the elements of which are in one-to-one relationship with the temporal positions of the estimations respectively corresponding to said available midambles.

Abstract: A spread spectrum code division multiple access communication system has a plurality of traffic channels. A plurality of traffic lights have a red state and a green state. Each traffic light is associated with a traffic channel. The state of each traffic light is based on an availability of that traffic light's associated traffic channel. The base station broadcasts each traffic light over a broadcast channel.

Abstract: A method is taught for improving the transmission of information signals in a communications system having a base station and a remote station. First and second transmission links are established with the remote station. An information signal is encoded to provide an encoded information signal having more bits than the information signal. First and second transmission signals are provided wherein each transmission signal has bits selected from the encoded information signal. Each of the first and second transmission signals is transmitted to the remote station by way of a respective one of the first and second transmission links. The remote station receives and combines the first and second transmission signals transmitted by the remote station to provide a combined encoded signal. The combined encoded signal is decoded by the remote station to provide the information signal.

Abstract: A method and network element for fast forward power control in a CDMA network includes establishing an artificial FPC_SUBCHAN_GAIN parameter having a value different from an actual FPC_SUBCHAN_GAIN parameter. The actual FPC_SUBCHAN_GAIN parameter represents an actual amount of power by which a punctured bit has been increased or decreased. The artificial FPC_SUBCHAN_GAIN parameter is substituted in place of the actual FPC_SUBCHAN_GAIN parameter during fast forward power control. The value of the artificial FPC_SUBCHAN_GAIN parameter is selected to compensate for a diversity gain occurring as a result of an adding of a link or a dropping of a link between at least one base station transceiver and a mobile station. Lastly, the artificial FPC_SUBCHAN_GAIN parameter is sent from the at least one base station transceiver to the mobile station.

Abstract: A system and method for communicating information signals using spread spectrum communication techniques. PN sequences are constructed that provide orthogonality between the users so that mutual interference will be reduced, allowing higher capacity and better link performance. With orthogonal PN codes, the cross-correlation is zero over a predetermined time interval, resulting in no interference between the orthogonal codes, provided only that the code time frames are time aligned with each other. In an exemplary embodiment, signals are communicated between a cell-site and mobile units using direct sequence spread spectrum communication signals. In the cell-to-mobile link, pilot, sync, paging and voice channels are defined. Information communicated on the cell-to-mobile link channels are, in general, encoded, interleaved, bi-phase shift key (BPSK) modulated with orthogonal covering of each BPSK symbol along with quadrature phase shift key (QPSK) spreading of the covered symbols.

Abstract: Method for transmitting an information representative of the number of spreading codes allocated to the mobile stations in communication with a base station of a mobile telecommunication system. The method forms a word to be transmitted, the content of which is representative of the number of spreading codes allocated. In each transmission burst a general midamble resulting from the sum of selected midambles among all the available midambles is included. The selection is done by the base station in relation with the transmitted word so that a selected midamble corresponds to a binary element of the transmitted word equal to a first value and a non-selected midamble corresponds to a binary element of the transmitted word equal to a second value. A received word is considered, the elements of which are in a one-to-one relationship with the temporal positions of the estimations respectively corresponding to the available midambles.

Abstract: An improvement to a spread-spectrum, code-division-multiple-access (CDMA) cellular system having multiple circuit-switched (CS) remote stations, multiple packet-switched (PS) remote stations and a base station per cell. The CS-remote station transmits a spread-spectrum CDMA signal, with a chip rate of fc, with a CS-symbol rate of fb, and with a power level PCS. The PS-remote station transmits a spread-spectrum CDMA signal with the chip rate of fc, PS-symbol rate fp, and with a power level PPS. The power level PPS from the PS-remote station and the power level PCS from the CS-remote station are related by a relation of the CS-symbol rate and the PS-symbol rate to efficiently share system capacity.

Abstract: A method and apparatus for direct sequence spread spectrum communication having low complexity. In the transmitter, the data bit is spreaded by a code sequence, a reference code is interleaved with the code sequence, and together they are transmitted by the transmitter. The corresponding receiver recovers the data signal from the received signal by transforming the received signal to a complex base band signal and differentially decoding the base band signal at the chip level. The spreaded signal is despreaded by the chip-level differential operation, thus eliminating the decorrelation operation, and so significantly reducing the cost of the overall system. Furthermore, this system is very robust to any carrier frequency drift since the chip-level differential operation is used, thus releasing the reference clock or crystal requirements, and so further reducing the cost of the system.

Abstract: The present invention is a method and apparatus for reducing transmission errors by a base station when transmitting a communication signal. An RF communication signal is received at the base station and analyzed for errors. A correction signal is then generated based upon the analysis. Prior to transmission of the communication signal from the base station, the communication signal is corrected using the correction signal.

Abstract: An improvement to a code-division-multiple-access (CDMA) system employing spread-spectrum modulation, with the CDMA system having a base station (BS) and a plurality of remote stations. The base station has a BS-spread-spectrum transmitter and a BS-spread-spectrum receiver. A remote station has an RS-spread-spectrum transmitter and an RS-spread-spectrum receiver. The BS transmitter transmits a broadcast common-synchronization channel, which includes a frame-timing signal. The broadcast common-synchronization channel has a common chip-sequence signal, which is common to the plurality of remote stations. In response to the RS-spread-spectrum receiver receiving the broadcast common-synchronization channel, and determining frame timing from the frame-timing signal, an RS-spread-spectrum transmitter transmits an access-burst signal, which includes, RS-power-control signals, transmitted in time, at increasing power levels.

Abstract: Received quality detecting section 108 detects a received quality, bit determining section 111 determines whether a TPC bit is 0 or 1, amplitude reading section 112 reads a ratio of an amplitude of a signal other than the TPC bit and an amplitude of the TPC bit, accumulating section 113 determines an increase or decrease of transmit power and an amount of the increase and decrease of the transmit power using a symbol of the TPC bit for the increase or decrease, and an amplitude ratio for the amount of the increase and decrease to instruct to transmission amplifier 104, and multiplying section 114 multiplies the amplitude of the signal other than the TPC bit by a correction value corresponding to the received quality to determine the amplitude of the TPC bit.

Abstract: A radio communication system includes a transmission apparatus and a reception apparatus, enabling to retransmit a frame which has caused a code error in the CDMA method, without lowering the transmission capacity. The transmission apparatus includes: an encoder for encoding an information to be transmitted and adding an error detection code; a storage; a transmission channel; a first multiplier provided in the transmission channel, for multiplying an output signal from the encoder by a first diffusion code so as to be a transmission signal destined to the reception apparatus; a second multiplier for multiplying a signal received from the reception apparatus, by a second diffusion code; a decoder for decoding the output signal from the second multiplier; and a transmission/reception block.

Abstract: A new spread spectrum phase modulation (SSPM) technique is applicable to both data and clock signals. The SSPM technique is more suitable to board level designs than the direct-sequence spread spectrum (DSSS) technique. In addition, SSPM may be combined with controlled edge rate signaling to outperform DSSS.

Abstract: A configurable cellular terminal engine (CTE) in accordance with an exemplary embodiment of this invention is configurable by an external agent (e.g., microcontroller, DSP, or state machine) to suit the particular requirements of different spread spectrum systems. In an exemplary embodiment, the CTE comprises on a chipset a modem unit and a channel codec unit. The modem unit has a front end unit for coupling to an antenna; a matched filter searchers unit coupled at least to the front end unit; a searchers unit coupled to at least the front end unit; a finger processing unit coupled to the front end unit; a parameter estimation processor unit coupled to at least the finger processing unit and the searchers unit; and a transmitter unit. The channel codec unit has a channel decoder unit coupled at least to the finger processing unit; and a channel encoder coupled at least to the transmitter unit.

Abstract: A satellite communications system (10) that employs an array of separate and easily deployable antennas (12) for transmission and reception purposes to accommodate high data rate transmissions. The antennas (12) can be deployed randomly at a communications site and are physically separated. Each antenna (12) transmits and receives the same information. A coded signal is used to identify the transmission from each antenna (12) for calibration purposes to align the bits transmitted by each antenna (12) and provide carrier frequency phase matching. The coded signals are used to compare the phase and timing relationship between each antenna signal and a reference antenna signal when the separate antennas receive all of the coded signals. Correction computations are performed and specialized phase and data alignment systems (24, 32) are employed to delay and adjust the phases of the various transmitted signals relative to the reference antenna (12) to provide the desired alignment.

Abstract: The present invention is an apparatus for reducing transmission errors by a base station when transmitting a communication signal. An RF communication signal is received at the base station and analyzed for errors. A correction signal is then generated based upon the analysis. Prior to transmission of the communication signal from the base station, the communication signal is corrected using the correction signal.