Abstract: A specific phase position detection circuit of the invention includes: a measurement unit that detects two time positions where a signal level of an analog signal is matched with a preset threshold value, as a first reference position and a second reference position in each cycle of the analog signal, and measures a time length between the first reference position and the second reference position, as a reference time period; a computation unit that computes a time period at a preset rate to the reference time period measured in each previous cycle, as an additional time period in each current cycle of the analog signal; and a detection unit that detects a time position shifted from the first reference position detected in a current cycle by the additional time period computed by the computation unit, as the specific phase position, and outputs a detection signal representing the detected specific phase position.

Abstract: A method of simultaneously determining a DC offset and a channel impulse response from a received signal in a mobile communication system. The received signal Y comprising a set of training sequence bits that have been modulated prior to transmission. The modulated signals experience a certain phase shift and are rotated by a certain angle. The received signal may also comprise a DC offset component ADC that needs to be removed. By manipulation of the received signal samples with the knowledge of the original training sequence TRS and method of modulation used, it is possible to simultaneously estimate the communication channel's impulse response H and the DC offset ADC by finding the Least Square solution to a linear equation, such that the energy of the noise term introduced into the communication channel may be kept to a minimum.

Abstract: A communication system including a transmitter, a receiver, and a TMDS-like link, in which video data and auxiliary data (typically including timing data associated with other auxiliary data) are transmitted from the transmitter to the receiver, or in which video data are transmitted over the link from the transmitter to the receiver, and auxiliary data (typically including timing data associated with other auxiliary data) are transmitted from the receiver to the transmitter. In typical embodiments the auxiliary data include one or more streams of audio data.

Abstract: A frequency recovery device and method, the method including a) dividing first data units and corresponding second data units delayed by time intervals, passing only parts of the data units from among the divided data units in the divided intervals, dividing the first and the second data units into four parts each having a 2k-mode interval size, passing each part and the data units contained in a predetermined-sized pull-in range interval positioned at front and rear parts of the data interval, allowing the remaining data to be padded to zero, and generating the padding result; b) generating pilot patterns in the divided data units; c) performing correlation between the padding results of the first and second data units at individual positions of the generated pilot patterns, and generating correlation values; and d) estimating a maximum correlation value from among the correlation values as a frequency offset.

Abstract: Briefly, a wireless communication device having a receiver includes a pilot signal interference canceller and a linear interference suppressor is provided. The pilot signal interference canceller and the linear interference suppressor jointly operate to cancel a pilot signal interference and other interference which are part of a received signal. A method for jointly cancel the interference by the pilot signal interference canceller and the linear interference suppressor is also provided.

Abstract: In a slot format of a received signal, AGC gain update timings (t1 to t4) are shifted every time to disperse and reduce an influence of a noise attributable to a direct current component specific to direct conversion which is accompanied by AGC gain update. In particular, in the case where each of slots in the received signal includes an information portion (data) having a larger code correcting capability and an information portion having a smaller code correcting capability (TPC (transmission power control), TFCI (transport format combination indicator), PILOT), the AGC gain update timing is generated while being shifted in the former information portion, thereby reduce the influence of the noise. When the amount of shift of the AGC gain update timing is set to be larger than that of one symbol of the received signal, the influence of the noise accompanied by the AGC gain update is further reduced.

Abstract: Various embodiments are described to provide for the transmission and reception of data in an improved manner. Data transmission is improved by including in a transmitter a null generator (110) to generate an output data symbol sequence that exhibits nulls in the frequency domain at particular frequencies that an input data symbol sequence does not. A pilot inserter (120) then adds a pilot symbol sequence to this output data symbol sequence to create a combined symbol sequence. Since the pilot symbol sequence exhibits pilot signals corresponding to the nulls of the output data symbol sequence in the frequency domain, the combined symbol sequence exhibits pilots that are orthogonal to the data in the frequency domain.

Abstract: When data bursts are transmitted between a base station and a mobile receiver, a changeover is made between a plurality of modulation methods during an existing radio link for modulation of the data. For resynchronization of the receiver in the event of the changeover, synchronization information items are determined from a first part (ET) of the data burst modulated by a first modulation method, and are used for synchronization with a second part (ZT) of the data burst modulated by the second modulation method.

Abstract: Aspects of providing automatic adaptation to frequency offsets in high speed serial links are described. First signals for phase adjusts in a receiver link are adjusted by detecting trends in the first signals to generate second signals, the second signals improving a rate of compensation for the frequency offsets by the phase adjusts. An up/down counter is included for counting signals for phase adjustments by a clock-data-recovery loop of a serial receiver. An adder is coupled to the up/down counter and outputs accumulated data indicative of a trend in the phase adjustments. Combinatorial logic coupled to the adder adapts the signals based on the accumulated data.

Abstract: The n-to-m bit down-scaling correlates a plurality of n-bit correlation integral values into a plurality of m-bit data (n>m). The n-bit correlation integral values are obtained by correlating global positioning system (GPS) signals with a plurality of expected codes. Upper (n?m+1) bits are selected from the n-bit correlation integral values, and (n?m+1)-bit estimated absolute values are obtained. A significant bit of a maximum value of the upper (n?m+1) bits of the estimated absolute values is selected. A scale level is obtained based on the significant bit of the maximum value. The n-bit correlation integral values are down-scaled into the m-bit data based on the scale level. The amount of n-bit correlation integral values is reduced into m-bit correlation integral values by the down-scaling method, and thereby reducing a size of the memory for storing the correlation integral values.

Abstract: Symbol by symbol variable code rate capable communication device. A communication device is operable to perform processing of a variable code rate signal whose code rate varies on a symbol by symbol basis. This may involve performing encoding of input to generate the variable code rate signal; alternatively, this may involve performing decoding of a variable code rate signal. In doing so, this approach may involve using a single encoder and/or decoder (depending on the application). In some instances, a single device is operable to encode a first variable code rate signal (for transmission to another device) and to decode a second variable code rate signal (that has been received from another device). In addition, a method of coding (including one or both of encoding and decoding) may also operate of a variable code rate signal whose code rate varies on a symbol by symbol basis.

Abstract: A biphase code detector and method for implementing the same. In accordance with one embodiment, the biphase code detector includes a receiver input for receiving a biphase encoded signal. The biphase encoded signal is a stream of unit bit cells each having a logic value encoded as a mid-bit transition between a first half-symbol signal component and a second half-symbol signal component. An integrated value is produced for the first and the second half-symbol components of a received unit bit cell. The biphase code detector further includes a delta detector that generates a difference signal corresponding to the difference between the integrated values of the first and second half-symbol components to determine the logic value of the received unit bit cell.

Abstract: A video encoder and corresponding method are provided for mixed inter/intra encoding of a macroblock having a plurality of partitions, where the encoder includes a reference picture weighting applicator coupled with a reference picture weighting factor unit for assigning weighting factors corresponding to each of the inter and intra coded partitions, respectively; and the corresponding method for encoding a macroblock with several partitions includes inter-coding at least one partition and intra-coding at least a second partition.

Abstract: A real-time pulse parameter estimator is disclosed herein. In one embodiment, an apparatus has pulse detection logic, an abnormal pulse filter, and a pulse parameter estimator. The pulse detection logic is operable to detect pulses and to record an arrival time of each detected pulse. The abnormal pulse filter is operable to analyze the arrival time of the detected pulses and to determine whether there are any abnormal pulses based on the analysis. In one embodiment, the abnormal pulse filter generates an adjusted time difference of arrival (TDOA) signal for a pulse, based on a determination that the pulse is abnormal. The pulse parameter estimator is operable to estimate a pulse parameter for the signal based on an analysis of the arrival times of the detected pulses and information pertaining to there being any abnormal pulses in the signal.

Abstract: A user equipment (UE) for establishing a communication link comprising a first module for processing a received communication signal and generating an index value associated with a primary synchronization code within said communication signal; a second module for generating a scrambling code group number, a slot offset, and secondary synchronization code based on output provided by the first module; a third module for retrieving a primary scrambling code based on the scrambling code group number and slot offset; and a controller coupled to said first module, second module, and third module for controlling an a search frequency of the UE for establishing a communication link.

Abstract: A method of detecting a signal in an input channel of a receiver includes applying each of a plurality of pre-detection bandwidths to an input signal. The method can include deriving, in a cascaded fashion, a plurality of pre-detection bandwidths for the input channel, and determining a temporal and spectral extent of pulsed energy in each of the plurality of pre-detection bandwidths. The derivation of the pre-detection bandwidths for the input channel can be performed by dividing the input channel into a sequence of smaller bandwidth sub-channels, so that the number of sub-channels is determined by how much bandwidth and pulse width range is able to be covered by a single detector.

Abstract: A channel detector has an anchor points inserter, a desired signal calculator, a distance calculator and a data detector. The anchor points inserter is adapted to choose values of expected transition locations for transition shifts within a received signal and to insert anchor points corresponding to the chosen values within a bit detection interval. The desired signal calculator is coupled to the anchor points inserter and is adapted to estimate desired signals corresponding to transition location information from the anchor points inserter. The distance calculator is coupled to the desired signal calculator and is adapted to generate a distance calculator output based on distances between the received signal and each of the desired signals. The data detector is coupled to the distance calculator and is adapted to identify a bit sequence corresponding to a desired signal having a minimum distance from the received signal.

Abstract: A method for decoding signals with encoded symbols over a symbol interval that modulate a carrier. The method includes phase locking the signal to be decoded to obtain a phase-locked signal. The value assumed by the phase-locked signal on at least one subinterval in each symbol interval is detected. The method continues with attributing to the decoded symbol corresponding to each symbol interval a value that is a function of the value detected the subinterval. The subinterval in question can be a single subinterval located at the end of the symbol interval. Alternatively, the value assumed by the phase-locked signal on a plurality of subintervals in each symbol interval is detected, and a respective majority value of said phase-locked signal within said plurality of subintervals is identified. A value determined on the basis of the majority value is attributed to the decoded symbol corresponding to each symbol interval.

Abstract: A receiver 200 as a component in a wireless communication device 100 and a corresponding method are used for receiving a multi-carrier communication signal and determining a timing offset thereof. The receiver 200 comprises a controller 222 to perform a correlation on each of a plurality of sub-carriers comprising the multi-carrier signal to provide a plurality of timing offsets. A quality metric corresponding to each of the plurality of timing offsets may be employed to select the best timing offset. Alternatively, a set of timing offsets whose quality metric exceed a threshold may be averaged. Either the best or average timing offset is used for processing all the sub-carriers of the multi-carrier signal.

Abstract: A method of detecting a predetermined complex data sequence in a received signal, representing for example a broadcast burst preamble in a wireless LAN transmission, involves (a) performing an auto-correlation on the data extracted from the received signal to provide an auto-correlation output, (b) combining the auto-correlation output with a delayed version of the auto-correlation output to produce a combined output and (c) providing a signal representing the predetermined data sequence if the combined output meets a predetermined condition, preferably also taking into account the phases of the auto-correlation output.

Abstract: A signature sequence is employed in a wireless transmission over a channel and is detected by a receiving station. The signature sequence is selected from a subset of sequences chosen from a set of sequences formed by delay-Doppler shifts of a base sequence. Use of the subset of sequences simplifies detection of the signature sequence by, e.g., facilitating use of a simpler detector structure. A subset of N2 sequences of the specially-constructed delay-Doppler shifted sequence set is selected to facilitate more efficient computation of the detection metric. A simplified detector employs algebraic techniques (such as Discrete Fourier 'Transform (DFT)) that exploit prudent sequence assignment strategy. As an advantageous variation, for a particular class of base sequences that can be represented by segments of equal-length sinusoids, even greater complexity reduction can be achieved by segmenting the delay-Doppler correlation accordingly and reusing past outcome in subsequent overlapping segments.

Abstract: A method, apparatus and system for accurately identifying discontinuous transmissions (DTX) and enabling the utilization of a dedicated control channel (DCCH) by determining if the frame satisfies a quality check, analyzing at least a portion of bits within the frame if the frame does not satisfy the quality check, determining if the bits analyzed exceed a threshold and identifying the frame as a DTX if the bits fail to exceed the threshold. Some embodiments further count a number of zero bits in a tail end of the frame, determine if the number of zero values exceed the threshold, determine if the frame includes an expected sequence of bits if the number of the zero bits does not exceed the threshold, and identify the frame as the DTX if the frame does not include the expected sequence.

Abstract: A symbol boundary detection device and a method thereof for use in a receiver of a multi-channel communication system. The device utilizes a threshold to make an auxiliary judgement so as to select a proper symbol boundary reference point within an early range. The threshold may be flexibly set in response to different characteristics of the systems. In addition, a pilot symbol guard interval matched filter is further utilized to determine whether a pilot symbol guard interval is received.

Abstract: An SIR information extracting section 106 extracts SIR measured at a communication terminal from the received data, and a fluctuation amount calculating section 109 calculates a fluctuation amount of SIR between time at which the communication terminal has measured SIR and transmission starting time of DSCH data using a TPC command, and a transmission system determining section 110 adds the SIR fluctuation amount calculated in the fluctuation amount calculating section 109 to the SIR measured at the communication terminal and estimates SIR of DSCH data so as to determine an optimal transmission system of DSCH data according to the estimated SIR.

Abstract: There is provided a code acquisition device and method using a two-step search process in a DS-CDMA UWB modem. The device includes: an I/Q channel symbol generating unit for, generating a plurality (i) of nth I/Q channel symbols in a first search process and generating a plurality of nth I/Q channel symbols in a second search process; a spread code selecting unit for receiving the plurality of nth I/Q channel symbols in the first search process; an NNC2NS tap I/Q channel symbol matched filter unit for, in the second search process, receiving the plurality (i) of nth I/Q channel symbols; a switching unit for changing to a closed state of the second search process; and a super frame and symbol boundary time deciding unit for deciding a super frame time and a symbol boundary time.

Abstract: According to one embodiment, a run length limiting apparatus comprises an input section configured to input, a digital data string including a predetermined number of symbols which have the same number of bits, a search section configured to search for a specific symbol having a pattern that does not match any of the symbols included in the input digital data string, a calculation section configured to perform an exclusive OR operation between the specific symbol searched for and each of the symbols included in the input digital data string, and an output section configured to output the calculated digital data string together with the specific symbol.

Abstract: A method for processing PDUs (Protocol Data Units) in a receiver, which can receive a PDU to which a TSN (Transmission Sequence Number) is allocated from a transmitter provided in an HSDPA (High-Speed Downlink Packet Access) communication system and store the received PDU in a reordering buffer. A receiver window size associated with the received PDU is set. When a sum of a TSN of the PDU at an upper edge of the receiver window and a value of the set receiver window size is larger than a value of a total TSN size where the TSN of the PDU from the transmitter is outside the receiver window, a corresponding PDU is allowed to be appropriately received if a TSN of the corresponding PDU is within a predetermined range even though the TSN of the corresponding PDU is smaller than the TSN at the upper edge of the receiver window.

Abstract: A method, communication system and communication unit for synchronisation for multi-rate communication by transmitting a signal (FIG. 4A) having a synchronisation portion at a first, predetermined chip rate and containing an indication of chip rate used for a further portion; receiving the transmitted signal, recovering the indication from the synchronisation portion at the first, predetermined chip rate, and recovering information in the further portion at the chip rate indicated by the indication. This provides improved efficiency in supporting multi-chip rates.

Abstract: The invention relates to communication between terminals. Where communication is over an ideal channel then a high throughput modulation scheme can be used. Where the terminals suffer interference or noise, transmission can be modified to a more robust modulation scheme. The modulation scheme for a signal to be transmitted from the terminal is normally selected based up measurements made on a signal received by the terminal. However, the uplink and downlink between two terminals may not be experiencing the same interference and noise. For example, an interfering source may affect one terminal more than another. Under these circumstances, the terminal will not get a good picture of the status of the channel or link over which it is about to transmit. Therefore, the invention provides a system where quality information is passed from the terminal receiving a signal to the terminal which sent the signal to help to determine the most appropriate modulation scheme.

Abstract: Briefly, a decoder to decode a desired symbol within a plurality of multipath components. The decoder may include processing window that may be positioned around the desired symbol within a group of multipath components. A method for decoding the symbol is also provided.

Abstract: The invention allows the detection and processing in a radio signal received by a receiver, of any signal of “pulsed” type present in radio signals applied to the input of a radiofrequency receiver, the receiver having an analogue/digital converter for performing the coding into digital on N bits of P successive samples of the analogue signal applied to the input of the receiver and a computer for processing the said digital signals, characterized in that on the basis of a histogram of the rate of occupancy of the digitized samples, graded in ranges Fx of amplitude-increasing sample levels, is determined, from among the ranges Fx, a range Fn onwards of which the total number of digitized samples Nnor contained in the ranges Fn and those below Fn is greater than or equal to a normality threshold Nn, Nn being a number predetermined as a function of the sensitivity of the detection of pulsed signals that one wishes to achieve.

Abstract: A radio signal receiving method grasps features of a propagation path at the start of communication and generates a template waveform corresponding to the features. A receiver examines a reception waveform of a propagation path condition judgment portion contained in a header portion of a packet, individually generates the template waveform in each communication session and performs correlation detection on the basis of the template waveform generated individually.

Abstract: A detected signal 111 contains a preamble portion which includes symbol alternations, followed by a unique word portion, and a data portion. Each time a symbol alternation is detected, a correction value calculation section 102 averages the phase shift in the detected signal 111 for a predetermined length, thereby calculating a correction value 115. The correction value determination section 103 stores a plurality of correction values 115 in a chronological order. When the unique word portion is detected, the correction value determination section 103 retains, as an effective correction value 118, a correction value which is arrived at by going back a predetermined number of correction values among the stored correction values. A phase rotation section 104 corrects the phase of the detected signal 111 by using an effective correction value 118 calculated by the correction value determination section 103.

Abstract: A method, arrangement (512) and communication receiver (500) for SNIR estimation of a received signal, by: deriving (512A) an estimation {circumflex over (Z)} of SNIR of the received signal in accordance with the relation Z ^ = [ E ? { ? r ? ( t ) ? } ] 2 E ? { r 2 ? ( t ) } - [ E ? { ? r ? ( t ) ? } ] 2 , where E represents mean value and r(t) represents the level of the received signal; and correcting (512B, 512C) the estimation {circumflex over (Z)} to produce a corrected estimation Z based on the relation Z=?({circumflex over (Z)})×{circumflex over (Z)}, where ?({circumflex over (Z)}) represents a correction factor. The estimation may be corrected by calculating the correction factor, retrieving the correction factor from a predetermined table (512B) or retrieving the corrected estimation from a predetermined table. The correction may be effected by adding to a logarithmic estimation a logarithmic correction factor.

Abstract: A greater likelihood decoder, a method of deriving a reduced substreams maximum likelihood (RSML) decoded symbol vector and a multiple-input, multiple-output (MIMO) receiver incorporating the decoder or the method. In one embodiment, the decoder includes: (1) a suboptimal decoder that analyzes a received symbol vector to generate substream indicators and a decoded symbol vector estimate, (2) weakest substreams decision logic, coupled to the suboptimal decoder, that receives the substream indicators and selects weakest ones thereof and (3) subspace search logic, coupled to the suboptimal decoder and the weakest substreams decision logic, that further selects a reduced substreams maximum likelihood (RSML) decoded symbol vector from a subspace of decoded symbol vector candidates derived from the decoded symbol vector estimate and the weakest ones.

Abstract: A decoding circuit and associated method are provided for decoding a biphase signal. The decoding circuit may include a precharging register to precharge a pair of states of the biphase signal, where a state of the pair of states is precharged at each pulse of a periodic precharging signal. The decoding circuit may further include a verification circuit to compare the two states of the pair of states and give an active error signal if the two states are equal.

Abstract: A method of reducing complexity in a Viterbi decoding algorithm used in intersymbol interference channels is provided. The method includes the steps of identifying a survivor path for an input symbol, making a hard decision about a polarity of the input symbol based on the identified survivor path, identifying a plurality of dominant error events for which the opposite polarity would be determined for the input symbol, measuring a penalty metric value based on the identified survivor path for each of the plurality of dominant error events, choosing a dominant error event having a least penalty metric value from the identified plurality of dominant error events, and calculating an approximation to a logarithmic likelihood ratio for the input symbol based on the survivor path and the chosen dominant error event.

Abstract: Provided is a dual-system transmitting device comprising a chaos signal generator that generates a chaos signal; a band-pass filter that filters the generated chaos signal into a signal within an information transmission bandwidth preset in a transmission side; an impulse signal generator that generates an impulse signal synchronized with a transmitted signal; a switching element that selectively outputs the chaos signal passing through the band-pass filter and the generated impulse signal; an amplifier that amplifies the signal selected by the switching element; and a signal transmitting unit that transmits the signal amplified by the amplifier through an antenna. When the signal amplified by the amplifier is a chaos signal, the signal transmitting unit modulates the amplified signal through an OOK (on-off keying) scheme such that the signal is transmitted as a carrier of a transmitted signal.

Abstract: The present invention discloses a method and system for detecting preambles in a multi-cell communication system. The method detects preambles reliably even in the presence of interference caused by multiple cells reusing the same frequency in the multi-cell communication system. After receiving a signal in the receiving period, the time domain signal is sampled and transformed into the frequency domain vector. The correlation vector is calculated with the frequency domain vector and pseudonoise code of the wireless station according to the method disclosed in this invention. The presence of a preamble is verified if the value in the correlation vector exceeds a predetermined threshold.

Abstract: A robust and flexible system for signal parameter measurements in the field of signal processing dynamically uses signal parameters from previous signal detections and parametric priorities to adaptively control and process the signal in an efficient and reliable manner. The system provides for improved fine grain signal parameter measurements through the use of adaptive arbitration to control signal processing. The system improves measurement accuracy for various signal characteristics including pulse width, amplitude, frequency and timing information. The system also provides signal parameter measurements while requiring less power, size, and weight than conventional systems.

Abstract: A bus system includes multiple devices and a bus. The bus is connected to each device. Each device may include a type of input/output (I/O) device, such as a random access memory (RAM) or a microprocessor. The bus transfers data between devices. Data of each device may be encoded with a unique orthogonal code. Encoded data of each device may be superimposed onto a bus so as to permit substantially concurrent communication on the bus by each of the devices. Data of each device is decoded by correlating the encoded data with the unique code used to form the encoded data.

Abstract: An initialization method is performed to initialize the states for producing downlink scrambling code for a wideband code division multiple access (WCDMA) mobile device. The initialization method uses an auxiliary linear feedback shift register (x-LFSR) advance the x-initial state to a new initial state that corresponds to a selected downlink scrambling code. The new initial state allows the remaining masks used for generating the downlink scrambling code to be fixed. Memory required to produce the downlink scrambling codes is therefore reduced, as it is no longer dedicated to storing the sets of masks corresponding to each of the possible downlink scrambling codes.

Abstract: A method of decoding data includes receiving a symbol and determining a data rate that was used to encode the symbol. A set of correlator output signals are generated based on a first mode when a first data rate was used to encode the symbol and based on a second mode when a second data rate was used to encode the symbol. A maximum-valued signal in one of the set of correlator output signals is identified. The maximum-valued signal in one of the set of correlator output signals is modulated.

Abstract: The present invention is directed to an apparatus for symbol timing detection for a wireless communication system. According to the present invention, the samples of the output of an analog-to-digital converter are utilized prior to the completion of the automatic gain control function to detect symbol timing using autocorrelations of the samples, and a structure supporting an average window size and a delay value is provided to optimize the complexity and allow a signal demodulation of high reliability.

Abstract: A description of signal behavior in the vicinity of a time and voltage of interest is produced by defining a region in the (time, voltage) plane that is a closed straight sided figure whose vertices are identified by threshold crossings offset for the voltage of interest and clocked by time delays offset from a clock time of interest. A first set of latches clocked by the time delays accumulates the state of signal behavior relative to the threshold voltages as it occurs, and their contents are subsequently transferred to a second set of latches at the start of a new clock cycle, allowing a new accumulation to begin and also allowing a detection logic circuit to operate on a unified and completed collection of indicators of what the just concluded description amounts to. The detection logic circuit responds to the combinations of latched indications to produce a signal corresponding to that description.

Abstract: A wireless communication transmitter includes: an encoder (1) for encoding signals of information; a preamble signal portion (7) for storing a preamble signal of a known signal sequence; and an addition portion (5) for adding the preamble signal to the encoded signals of information and is characterized in that at least part of the preamble signal has periodicity of Tw/N (Tw: symbol length, N: an integer equal to 1 or greater) determined depending on the difference in the communication system of transmission.

Abstract: A system for time delay estimation in a discrete time processing system includes a cross correlator that performs cross correlation on a first signal and a second signal, and provides a cross correlated output signals indicative thereof. A lag smoother receives the cross correlated output signals, and provides lag smoothed output signals indicative thereof. A select logic module selects a pre-defined number of signal values from a respective set indicative of the lag smoothed output signals to compute the time delay estimation associated with the first and second signals.

Abstract: A method of detecting a silent frame at a mobile station in a GSM transmission is disclosed. The method comprises first receiving a data burst intended for the mobile station. Then, a signal-to-interference-and-noise ratio (SINR) is determined for the data burst. If the SINR is below a predetermined threshold, then the data burst is determined as from a silent frame.

Abstract: At the transmitter side, carrier waves are modulated according to an input signal for producing relevant signal points in a signal space diagram. The input signal is divided into, two, first and second, data streams. The signal points are divided into signal point groups to which data of the first data stream are assigned. Also, data of the second data stream are assigned to the signal points of each signal point group. A difference in the transmission error rate between first and second data streams is developed by shifting the signal points to other positions in the space diagram expressed at least in the polar coordinate system. At the receiver side, the first and/or second data streams can be reconstructed from a received signal. In TV broadcast service, a TV signal is divided by a transmitter into low and high frequency band components which are designated as first and second data streams respectively.

Abstract: In a communication system in which an incoming signal is pulse shaped prior to detecting the information bearing point of the signal, processing overhead can be significantly reduced by only processing the sample points corresponding to the information bearing point and two points bounding the information bearing point. During signal acquisition, the signal is over sampled and the pulse shaping filter processes every sample point, or every Nth sample point in the case of down sampling. Once the sample point corresponding to the information bearing point is determined, the pulse shaping filter can be instructed to only process the sampling corresponding to the information bearing point and two neighboring samples. The system and method is adaptive, in that the samples that are processed can shift as the information bearing point shifts relative to the sample points. This is accomplished by re-synchronizing the timing of the received slot.