Abstract: A novel method of communicating in a Multi-Input/Multi-Output communication system. The method includes receiving channel status information corresponding to each transmitting data stream in the MIMO system, and determining a common modulation scheme to use for all of the transmitting data streams based on the received channel status information. A common coding scheme, common modulation scheme, or a common modulation and coding set may also be selected based on the received channel status information.

Abstract: The present invention discloses a low-complexity estimation method for obtaining a weighting vector for an antenna system with adaptive phased arrays. A first matrix is generated from a plurality of statistically independent symbols of the receiving signals. The plurality of statistically independent symbols is received from two or more antennas over some period of time without a prior knowledge of the properties of the symbols. A second matrix, which is the covariance matrix of the first matrix, is calculated. Subsequently, a column or row is selected from the second matrix to be the weighting vector for two or more antennas in an adaptive phased array antenna system.

Abstract: A vehicle is provided with a navigation system that includes a traffic information receiver and a radio receiver. The traffic information receiver receives traffic information from one of multiple traffic information broadcasting stations having respective service regions. The radio receiver selectively receives (i) traffic information from one of the multiple traffic information broadcasting stations and (ii) a radio program from a radio broadcasting station. When the vehicle approaches a border between (i) a current service region where the traffic information receiver is receiving traffic information and (ii) a neighboring service region, whether the radio receiver is in use or not is determined. Based on the determination, the traffic information receiver or the radio receiver is tuned to a traffic information broadcasting station covering the neighboring service region.

Abstract: A base station signal is applied to antenna elements. One signal from a first element is electrically modified and evaluated in conjunction with a second, unmodified signal from a second element. The modified signal is further modified and again evaluated with the unmodified signal. The results of the two evaluations are compared to determine a relative phase and/or amplitude at the respective elements.

Abstract: An approach is provided for supporting transmission in a multi-input-multi-output (MIMO) communication system including a plurality of terminals. A preamble portion of a frame is transmitted by a multiple transmit antennas of a hub using Orthogonal Frequency Division Multiplexing (OFDM) to the terminals over a channel, wherein each of the terminals determines a characteristic of the channel with respect to the transmit antennas as feedback information. The hub receives the feedback information from the terminals. The hub selects, according to the feedback information, a subset of the antennas for transmission of a remaining portion of the frame to the terminal.

Abstract: Transmitted symbols are estimated from received signals. The likelihood of the estimated transmitted symbols is calculated. The mean value and variance of the transmitted symbols are calculated from information indicating the likelihood, and MMSE coefficient for compensating the channel is calculated according to the mean value and variance. The transmitted symbols are estimated again using the MMSE coefficient. The estimation process is repeatedly performed twice or more.

Abstract: A method for performing roaming in a dual mode mobile terminal in such a manner that a ping-pong phenomenon, occurring under a weak electric field between communication networks providing communication services using different mobile communication techniques can be prevented. To this end, a communication path connected between modems performing a corresponding communication service is realized, so that roaming to a target mode can be achieved only in a case in which the intensity of a received signal measured through a target modem for the roaming has at least a predetermined threshold value. Where the intensity of the received signal has not at least the predetermined threshold value, a current mode is continuously maintained.

Abstract: An electronic device comprises an antenna, a first wireless communication module coupled to the antenna, which is complied with a first communication protocol, a second wireless communication module coupled to the antenna, which is complied with a second communication protocol, and a filter coupled to the antenna, the first wireless communication module, and the second wireless communication module. The filter distributes a signal received by the antenna to one of the first wireless communication module and the second wireless communication module in accordance with frequency of the signal.

Abstract: The demodulator in the receiving module of the invention supplies a signal produced based on a signal level detected by a first detector to a second amplifier as an amplification degree adjustment signal. With this arrangement, when a second receiver works, an AGC voltage supplied to the second receiver is already close to an ultimately converging certain value. The AGC voltage supplied to the second receiver is thus stabilized in its value, from the value close to the ultimately converging certain value to the certain value. Accordingly, a time period required from the second receiver starts working until the AGC voltage supplied to second amplifier ultimately converges into the certain value is shortened.

Abstract: A wireless communication apparatus includes a plurality of antennas, transmits a plurality of known symbol sequences each including a plurality of known symbols by using the antennas, each of the known symbols having subcarrier arrangement on which plural known information of the each of the known symbols are carried on, and inversion/non-inversion of a phase of known information on one of two adjacent subcarriers of the subcarrier arrangement being controlled in accordance with the number of the known symbols and time position of the each of the known symbols, and transmits data symbols by using the antennas after the known symbol sequences are transmitted.

Abstract: Disclosed herein is a demodulating device including, first high-frequency receiving means and second high-frequency receiving means for receiving a high-frequency signal of one of a first frequency and a second frequency, first signal strength detecting means and second signal strength detecting means for detecting strengths of signals received by the first high-frequency receiving means and the second high-frequency receiving means, respectively, and strength determining means for performing control so as to make the second high-frequency receiving means receive a high-frequency signal of the first frequency when the first high-frequency receiving means is made to receive the high-frequency signal of the first frequency and the second high-frequency receiving means is made to receive a high-frequency signal of the second frequency and when the second signal strength detecting means does not detect a predetermined signal strength within a predetermined time after the first signal strength detecting means dete

Abstract: A receiver has a first (12) and a second radio system (14). The first radio system (12) is a zero-power system and the second radio system (14) can either be in an active-state or in an off-state. The first radio system (12) is designed to bring the second radio system (14) from an off-state back into an active state upon receipt of a dedicated radio signal.

Abstract: A wireless broadband communications system that can maintain high data rates while taking into account channel interference resulting from operating in shared frequency bands, signal fading resulting from dynamic channel degradation, and signal distortion resulting from compliance with maximum power output regulations. In one mode of operation, the system performs adaptive modulation by transmitting a first signal over a selected channel using a first modulation mode having a level of distortion associated therewith resulting from operating the system at a predetermined maximum power output level. Next, a SINAD level is measured on the first channel. The level of distortion associated with the first modulation mode is then subtracted from the measured SINAD level to obtain a first noise level.

Abstract: A frequency domain diversity DVB receiver device includes multiple antenna ports for receiving radio signals, and radio signal processing circuits connected to the antenna ports that convert the received radio signals into digital samples. The digital samples from the different antenna ports time-share a front-end processor which processes the digital samples to provide time-domain symbols. The time-domain symbols are stored in time-domain symbol buffers according to which of the antenna ports the time-domain symbols are received. A fast fourier transform circuit then retrieves the time-domain symbols and converts them frequency-domain symbols, which are then stored one or more frequency-domain symbol buffers according to the antenna ports the corresponding radio signals are received. A diversity processor which combines the frequency-domain symbols from the frequency-domain symbol buffers.

Abstract: Global Positioning System (GPS) and non GPS position finder, emergency, multiple input multiple output (MIMO), multimode, spread spectrum, code division multiple access (CDMA), Global Mobile System or Global System Mobile (GSM) and orthogonal frequency division multiplex (OFDM) communication systems. Position finder and emergency communication multiple input multiple output (MIMO) system and a receiver having multiple inputs for reception and demodulation of position finder signals to position finder baseband signals. A processor for processing position finder signals with a signal containing an emergency number. A processors for processing signals to provide cross-correlated shaped in-phase and quadrature-phase baseband signals, spread spectrum and OFDM baseband signals. A control unit for control and selection of one of the jointly processed signals and a selector for providing the selected signal to a modulator.

Abstract: The present invention relates to a high-speed interface for radio systems, in particular to a synchronous serial digital interface for a car radio. In an embodiment, the synchronous serial digital interface for at least dual radio receiver systems includes a master device and a slave device. The dual radio receiver system has an intermediate frequency. The master device and the slave device exchange data in a bi-directional manner on at least one communication channel; the master device and the slave device have a unique bit clock; the master device supplies a synchronization signal to the slave device. The synchronization signal has a frequency spectrum with an amplitude at the intermediate frequency lower than the amplitudes at the other frequencies of the synchronization signal.

Abstract: A dual band direct conversion architecture for both the receive (RX) and transmit (TX) path of a communications transceiver that minimizes the transceiver area by sharing common circuits used in both RX and TX paths is disclosed. The transceiver also allows the use of extensive digital calibration in order to achieve performance adequate to support high bit rate modulation schemes.

Abstract: A receiving circuit for receiving a high frequency signal is provided which includes a mixer, a local oscillator, a switch circuit, and a controller. The switch circuit switches over between first and second cases. The controller controls in the first case to turn on power supply to the local oscillator, and controls the switch circuit in the first case to output the local oscillation signal outputted from the local oscillator to the mixer, and to output the local oscillation signal through the local oscillation signal output terminal. The controller controls in the second case to turn off power supply to the local oscillator, and controls the switch circuit in the second case to output the local oscillation signal inputted through the local oscillation signal input terminal to the mixer.

Abstract: A radio receiver system, having two receiving antennas, two receivers, and a transformer transmitter, which is provided for the purpose of supplying radio signals of both antennas to each of the receivers, the transformer transmitter having a first winding and a second winding, wherein the two receiving antennas are connected to the end terminals of the first winding, and a first of the two receivers is connected to a center tap of the first winding and the second of the two receivers is connected to an end terminal of the second winding.

Abstract: A first low-noise amplifier is connected to a first receiving processing unit through a first cable and a bypass circuit is provided in parallel to the first low-noise amplifier so as to bypass the first low-noise amplifier. In the case that the intensity of broadcasting signal is more than a predetermined value, when the C/N is more than a first predetermined value and less than a second predetermined value higher than the first predetermined value, the broadcasting signal is transmitted to the first cable through the first low-noise amplifier, and when the C/N is less than the first predetermined value or more than the second predetermined value, the broadcasting signal is not input to the first low-noise amplifier but transmitted to the first cable through the bypass circuit.

Abstract: The present invention provides a diversity receiver and diversity reception method utilized for CDMA communication system. Antenna switching using antenna diversity is made possible with one decoding subsystem without losing the received data. A receive subsystem 6 receives an intermittent signal for standby operation by a first antenna 1 or a second antenna 2, the signal being sent out every slot cycle from each base station. Information about the received field strengths at the first and second antennas, 1 and 2, is acquired from the signal received by the receive subsystem 6. Base on this information, one of the first antenna 1 and second antenna 2 in a better reception environment when a transition is made from standby mode to a phone conversation is switched and connected to the receive subsystem 6. Then, the conversation is performed.

Abstract: Disclosed is a space-time coding apparatus in a mobile communication system. The space-time coding apparatus includes a de-mapper for converting a non-binary symbol into a stream of m×a binary bits, and transmits the stream of binary bits output from the de-mapper via a plurality of antennas. The number of the antennas is m, and a distributor separately distributes the m×a binary bits to the m antennas.

Abstract: The present invention discloses a base transceiver station (BTS) equipped with a plurality of antennas for improving the robustness of spatial division multiple access via nullng. The BTS comprises of a first matrix module receiving a plurality of signals from one or more customer premises equipments (CPEs) through the plurality of antennas and producing correspondingly a first plurality of covariance matrices representing the plurality of signals, a second matrix module receiving the first plurality of covariance matrices and generating correspondingly a set of derivative spatial signature matrices representing the CPEs respectively, a third matrix module receiving the derivative spatial signature matrices and producing correspondingly a second plurality of covariance matrices representing interferences of the CPEs, and an eigenvector module generating a plurality of beamforming vectors for the CPEs from the plurality of derivative spatial signature matrices and the second plurality of covariance matrices.

Abstract: A receiver sets weights for an antenna array according to a series of algorithms including an energy algorithm, a least squares algorithm and a least mean square algorithm.

Abstract: A circuit for providing enhanced directivity in the form of a narrowed receive beam and a relatively small antenna with performance comparable to a much larger antenna at similar frequencies. Received signals are converted to digital values and stored in a manner which enables subsequent processing directed to improving the resolution of the received signals and to reduce the associated noise corresponding to the received data samples. The Signal-to-Noise ratio of the received data signals is improved as a result of processing techniques made possible by the configuration of the antenna and the digitally stored nature of the received data.

Abstract: A 2D Rake receiver is proposed, comprising: a control module, for generating, according to a reference signal and the radio signals received by a plurality of antenna elements, the multipath information about the radio signals; a weight factor calculating unit, for calculating the corresponding weight factors of the received radio signals corresponding to different antenna elements according to the multipath information; a plurality of 1 D Rake receivers, each of which is for receiving radio signals from the corresponding antenna element and weighting the radio signals received by the Rake receiver with the corresponding weight factor; a combining unit, for combing the weighted radio signals outputted from the plurality of 1 D Rake receivers, to output a combined signal.

Abstract: The present invention relates to a blind detection of a received signal having at least one property, which initially is unknown to the receiver, however, limited to a finite set of alternatives ({p1, p2, . . . , pm}). According to the invention, the unknown property is automatically identified as follows. A respective quality measure (q1, q2, . . . , qm) is derived from the incoming signal (r(n)), which each represents a particular property in the finite set of alternatives ({p1, p2, . . . , pm}). The quality measures (q1, q2, . . . , qm) are obtained according to a procedure that involves a computationally efficient rejection of any unwanted signal components in the incoming signal (r(n)). Then, the quality measures (q1, q2, . . . , qm) are compared with each other in order to find a quality measure, which best fulfills a blind selection criterion. The quality measure (qi) thus obtained corresponds to the initially unknown property (pi).

Abstract: Processing diversity signals includes receiving diversity signals at a number of antennas. The diversity signals have communicated information, and the antennas are associated with channel paths. A phase of at least one diversity signal is adjusted. The diversity signals are combined to form a combined signal. The combined signal is processed to yield the communicated information. A combined complex channel gain estimate is determined from the combined signal. An individual complex channel gain estimate is calculated for each antenna from the combined complex channel gain estimate. Phase adjustments associated with the channel paths are established according to individual complex channel gain estimates. The phase adjustments are applied to next diversity signals having next communicated information. The next diversity signals are processed to yield the next communicated information.

Abstract: A communication system for transmitting encoded signals over a communication channel is disclosed. The system includes a transmitter, which has a source that is configured to output a message signal, and an encoder that is configured to generate a code word in response to the message signal. The code word is based upon a stacking construction that is generalized for the communication channel. The communication channel is characterized as a multi-input multi-output (MIMO) block fading channel. The transmitter also includes a modulator that is configured to modulate the code word for transmission over the communication channel. Further, the transmitter includes a plurality of transmit antennas that are configured to transmit the modulated code word over the communication channel. The system also includes a receiver, which has a plurality of receive antennas. The receiver is configured to receive the transmitted code word via the plurality of receive antennas.

Abstract: The invention is a terminal, system and method for providing inter-frequency and inter-system handovers. A terminal 20? in accordance with the invention includes at least one radio transceiver including P radio receivers and at least one transmitter (16) with P being an integer at least equal to 2. Each radio receiver includes an antenna (41) which receives M encoded data streams. A terminal controller 18 controls the that at least one radio transceiver.

Abstract: A receiver in a MIMO-OFDM system may process OFDM symbols received on a number (MR) of receive antennas. The system may utilize a MIMO-OFDM frame format that includes additional long training OFDM symbols, for training additional antennas and for link adaptation, and a header with an additional SIGNAL symbol to indicate MIMO-OFDM-specific information.

Abstract: Vector orthogonal frequency division multiplexing (VOFDM) receiver correlation matrix processing using factorization. Efficient correlation matrix processing is used to combine multiple signals into a single combined signal. This single combined signal may be viewed as being a beam form soft decision. An efficient square root factorization system and method provides for computational resource savings while, at the same time, providing for greater precision of the overall computational results. By reducing intermediate variable calculation dynamic ranges, the overall calculation becomes more precise. Particularly within fixed-point arithmetic applications, a reduction in dynamic range of the intermediate variable calculations provides for a significant increase in final calculation precision.

Abstract: A radio communication apparatus at a transmission side that includes a plurality of transmission antennas and performs a communication using at least one carrier. The radio communication apparatus includes a channel dividing unit configured to divide a transmission signal into a plurality of channels based on channel structure information returned from another radio communication apparatus at a reception side and indicating a structure of a space-division-multiplexing-channel and a space-time-coding channel between transmission and reception antennas, and a space-time-coding unit configured to realize transmission diversity by performing a space-time-coding processing for each of the plurality of channels.

Abstract: A transceiver system according to the present invention transmits data utilizing the baseband and one or more frequency separated transmission bands. A baseband transmitter is combined with one or more transmitters that transmit data into one of the frequency separated transmission bands. A baseband receiver is combined with one or more receivers that receive data from the frequency separated transmission bands. Any combination of modulation systems can be utilized (e.g. PAM for the baseband and QAM for the frequency separated bands). A transceiver circuit or chip according to the present invention includes a transmitter and a receiver and communicates with a corresponding transceiver chip. In some embodiments, one baseband PAM transmitter is combined with one frequency separated QAM transmitter.

Abstract: The present invention relates to an automatic gain controller in a wireless packet communication system and an automatic gain control method thereof. The automatic gain controller includes a variable gain amplifier, a signal saturation determining unit, a power calculator, and a gain controller. The gain controller includes a first gain selector and a second gain selector. In the automatic gain control method, an establishment gain of a variable gain amplifier is reduced when the number of samples greater than a predetermined reference is greater than a predetermined number. After a received power value is measured, the establishment gain is controlled by a difference between the received power value and a reference power value.

Abstract: In the diversity receiver, the RF switcher switches the received signals to supply them to the RSSI power detector equipped with diversity function. Subsequently, the RSSI power detector with diversity function feeds the RF switcher with an antenna switching signal. According to the determination of antennas at this instance, an IQ start-up signal for starting up the I/Q subsection is produced to make the I/Q subsection operate assuredly in response to a signal intended to receive, without operating the I/Q subsection in response to an erroneous detection of noise during processing therein, thereby eliminating useless operation.

Abstract: Methods and apparatus demodulate and decode a plurality of AM and FM arriving signals, which permit, for example, a utility data-collecting unit to concurrently receive and decode transmitted signals of legacy transmitters as well as more recent FM based transmitters, or signals arriving from hybrid systems configured to transmit both AM and FM.

Abstract: A multi-antenna receiving and processing circuit assembly is disclosed to include multiple antennas for receiving wireless signals, multiple pre-processing units respectively electrically connected to the antennas, a matching circuit electrically connected to the pre-processing units for matching signals from the pre-processing units into a matching signal, a post-processing unit electrically connected to the matching circuit for processing the matching signal from the matching circuit through a single intermediate frequency signal and into a plurality of audio frequency signals respective to each antenna, and an output circuit electrically connected to the post-processing unit for outputting the audio frequency signals to external audio output devices.

Abstract: A system for processing data in a ubiquitous home network is provided. The system uses RF signals based on combination of the remote-controller and the ubiquitous sensor network (USN) technologies and integrally controls a plurality of control targets. Although the remote-controller is spaced relatively far apart from the control targets, the system can control the control targets only if the spaced distance is within the range of an RF signal. As well, the system can automatically control the control targets based on the information detected by the respective sensor nodes.

Abstract: A modem generates a new RSSI threshold value in response to a flag signal representing the quality of the threshold value indicated by the result of error detection supplied from one monitor, and supplies the generated threshold value to another monitor. The RSSI threshold value set in the other monitor is rendered variable, the modem thus being able to operate with the threshold value converging precisely in a short time.

Abstract: An apparatus and method for receiving a signal in a MIMO communication system are provided. In the signal receiving method, a first received signal received at each of the receive antennas is equalized in a predetermined first method. Each of the equalized transmit antenna signals is despread with a plurality of spreading codes used in a transmitter. The strongest transmit antenna signal is detected among the despread transmit antenna signals, and decoded in a predetermined second method, for error verification. The verified strongest transmit antenna signal is reproduced as an interference signal. A second received signal is generated by subtracting the interference signal from the first received signal and equalized in the first method. The above operation is repeated on the equalized transmit antenna signals except the strongest transmit antenna signal.

Abstract: An apparatus and method for Transmit Diversity mode transition in a mobile communication system for use with transmit diversity is disclosed. In a mobile communication system including a Node B comprising one or more antennas and a Mobile Station (MS) for transmitting Transmit Diversity information to the Node B to enable the plurality of antennas to implement the maximum Transmit Diversity. The apparatus and method for assigning weights to transmission data of the antennas to enable the Node B to implement the maximum Transmit Diversity when the mode transition occurs in the Transmit Diversity modes comprise determining whether the mode transition occurs using the Transmit Diversity information; and assigning a weight generated considering the relationship between a current weight and a previous weight used before the mode transition time to the data transmitted over the antennas if it is determined that the mode transition occurs.

Abstract: A method and apparatus for adaptively determining weights for transmission antennas according to a channel condition in a closed-loop transmit diversity system using a plurality of transmission antennas. The antenna weights are determined using variation of channel characteristics based on time and space, to thereby improve bit error rate performance. Parameters for fixing average transmission power per symbol according to the statistical channel characteristics for symbol energy and additive white Gaussian nose energy are previously determined to estimate channel characteristics. The antenna weights are determined using the parameters and channel gains estimated upon reception of data symbols.

Abstract: Systems and methods are disclosed for a wireless communications device for receiving wireless electronic signals including first wireless electronic signals at a first frequency and second wireless electronic signals at a second frequency. The wireless communications device includes an antenna adapted to convert the wireless electronic signals into input electronic signals, and an amplifier coupled to the antenna, said amplifier being capable of amplifying the input electronic signals to produce amplified electronic signals and a diplexer adapted to receive the amplified electronic signals and selectively output one of the first electronic signals at the first frequency and the second electronic signals at the second frequency.

Abstract: Methods and systems for performing channel estimation in a multiple antenna block transmission system are provided so as to improve the channel estimation quality and/or the delay spread of the channels that can be estimated.

Abstract: An active UHF amplifier includes a transistor having a base for receiving signals, a grounded emitter, and a collector for outputting signals, a first inductor having a first end for coupling to a voltage source, the inductance of the first inductor being between 10-100 nano-Henries, a first capacitor having a first end coupled to the first end of the first inductor, a second inductor having a second end coupled to the base of the transistor, the inductance of the second inductor being between 1-100 nano-Henries, a second capacitor having a first end coupled to a first end of the second inductor, the capacitances of the first and the second capacitor being between 10 pico-Farads and 100 nano-Farads, a first resistor, and a second resistor having a resistance divided by the resistance of the first resistor and multiplied by a voltage of the voltage source being between 0.5-0.8 volts.

Abstract: A method for antenna subset selection by joint processing in RF and baseband in a multi-antenna systems. Lt input data streams are generated in a transmitter for either diversity transmission or multiplexing transmission. These streams are modulated to RF signals. These signals are switched to the t branches associated with the t transmit antennas, and a phase-shift transformation is applied to the RF signals by a t×t matrix multiplication operator ?1, whose output are t?Lt RF signals. These signals are transmitted over a channel by t antennas. The transmitted signals are received by r antennas in a receiver. A phase-shift transformation is applied to the r RF signals by a r×r matrix multiplication operator ?2. Lr branches of these phase shifted streams are demodulated and further processed in baseband to recover the input data streams.

Abstract: In a portable phone having installed therein a PHS and a WLAN, the PHS is used for standby as long as the PHS is in the coverage area. At the time of receiving an incoming call during standby by the PHS with only the PHS being ON, the power of WLAN is turned ON. If the WLAN is in the coverage area, the incoming call is once disconnected, and immediately a VoIP call is sent (call back) by the WLAN. At this time, the PHS is turned OFF. On the other hand, if the WLAN is out of the coverage area at the time of receiving the incoming call, the call is similarly disconnected, after which the WLAN is turned OFF and the VoIP call is sent by the PHS.

Abstract: A diversity reception apparatus having a simple configuration which includes only one AD conversion unit and receives analog modulated signals is provided. The diversity reception apparatus includes a switching unit that analog-multiplexes signals received by two antennas using time-division method and is placed in front of an AD conversion unit. The apparatus also includes a time-division separation unit that (i) obtains time-division multiplexed signals digitized by driving at the same frequency as driving frequency of the AD conversion unit and (ii) separates the time-divided signals into a signal per antenna. Moreover, the apparatus includes signal quality judgment units that judge each signal quality of the time-divided signals and a composition unit that executes composition processing based on the signal quality.

Abstract: A system and method for receiving output signals from each receiver of multiple receivers, the output signals generated based on receipt of a same transmission; incrementing a count value associated with each receiver based on the output signals; and determining whether a fault in a receiver exists based on the associated count values of the receivers.