Abstract: A cognitive telecommunication terminal designed to coexist with a primary telecommunication system using a set (B) of transmission frequencies comprising a plurality of spatially distributed transmitters, each transmitter being suitable for transmitting within a coverage area in a plurality of frequency bands in said set allocated to the transmitter. The terminal comprises positioning means, a database storing information defining the coverage area for each transmitter, calculation means suitable for determining the maximum power that the terminal can transmit for each frequency band in said set, and for sorting frequency bands as a function of the maximum powers thus obtained. Finally, the terminal comprises radio transmission/reception means suitable for detecting the presence of a signal in the frequency bands thus sorted, beginning with the frequency band associated with the highest maximum power.

Abstract: A transmitter usable for wireless communication includes a plurality of transmit antennas. Each transmit antenna transmits a transmit signal. The transmitter also includes means for introducing time shifts to each of a plurality of spatial stream signals and means for operating on each of the plurality of spatial stream signals with a spatial rotation vector matrix, thereby mapping each of the plurality of spatial stream signals to one of the transmit signals.

Abstract: A multiple frequency antenna array includes a first antenna circuit and a second antenna circuit. The first antenna circuit has a first radiation pattern and is tuned to a first carrier frequency. The first antenna circuit transmits a first representation of a radio frequency (RF) signal at the first carrier frequency, where the first carrier frequency corresponds to a carrier frequency of the RF signal and a first frequency offset. The second antenna circuit has a second radiation pattern and is tuned to a second carrier frequency. The second antenna circuit transmits a second representation of the RF signal at the second carrier frequency, where the second carrier frequency corresponds to the carrier frequency of the RF signal and a second frequency offset.

Abstract: An integrated circuit (IC) includes a baseband processing module and a radio frequency (RF) section. The baseband processing module is coupled to convert outbound data into amplitude modulation information and phase modulation information when the IC is in a cellular data mode and to convert an outbound radio frequency identification (RFID) signal into RFID amplitude modulation information when the IC is in an RFID mode. The RF section is coupled to generate an outbound RF data signal in accordance with the amplitude modulation information and the phase modulation information when the IC is in the cellular data mode and to generate an outbound RF RFID signal in accordance with the RFID amplitude information when the IC is in the RFID mode.

Abstract: A programmable telemetry circuit that may be programmed for high bandwidth, low Q; low bandwidth, high Q; or for other parameters. The programmable telemetry circuit may include a first coil; a high impedance path having a first node connected to a first node of the first coil; a low impedance path having a first node connected to the first node of the first coil; a capacitive path having a first node connected to a second node of the first coil; and an input path for coupling signals into the high impedance path, the low impedance path, and the capacitive path. The low impedance path may be connected in parallel with the high impedance path. The capacitive path may form a circuitous path with the high impedance path and the low impedance path. The programmable circuit may be programmed to select the high impedance path or the low impedance path.

Abstract: Systems and methods that provide channel-adaptive antenna selection in multi-antenna-element communication systems are provided. In one embodiment, a method that selects a subset of receive antennas of a receiver to receive a transmitted RF signal may include, for example, one or more of the following: establishing possible subsets of the receive antennas; determining sets of channel parameter statistics corresponding to the possible subsets of the receive antennas; computing output bit error rates of the receiver, each output bit error rate being computed based on at least one set of channel parameter statistics; selecting a particular possible subset of the receive antennas based upon a criterion predicated on the computed output bit error rates; and connecting one or more RF chains of the receiver to the receive antennas of the selected particular possible subset.

Abstract: A communications apparatus comprising a first antenna, a first serial configuration of a first power amplifier and a first matching network, a second serial configuration of a second power amplifier and a second matching network, a switching element for switchably selecting the first or the second serial configuration for supplying a signal to the first antenna, the first and the second power amplifiers supplying a respective first signal of a first power and a second signal of a second power different than the first power to the first antenna for transmitting and the first and the second matching networks presenting respective first and second impedances to the respective first and second power amplifiers, the first and the second impedances responsive respectively to a power-related parameter of the first and the second signals.

Abstract: Of any one of transmission method X of transmitting modulated signal A and modulated signal B including the same data from a plurality of antennas and transmission method Y of transmitting modulated signal A and modulated signal B having different data from the plurality of antennas, base station apparatus 201 does not change the transmission method during data transmission and changes only the modulation scheme. Base station apparatus 201 transmits modulated signal A and modulated signal B to communication terminal apparatus 251 using the determined transmission method and modulation scheme. In this way, it is possible to improve data transmission efficiency when transmitting data using the plurality of antennas.

Abstract: A wireless communication device has a plurality of antennas and has MIMO functions that receive a plurality of spatially multiplexed signal sets, perform an inverse matrix computation using SN ratios of the plurality of the signal sets, based on a transfer function of a transmission path of the plurality of the signal sets, decode a first encoded signal in which is encoded the plurality of the signal sets on which the inverse matrix computation was performed, and output a decoded signal. The wireless communication device includes an encoder that generates a second encoded signal by encoding the decoded signal and a control portion that, if one of the SN ratio and the difference between the first encoded signal and the second encoded signal does not meet a specified standard, shifts the wireless communication device to a reduced power consumption state in which the amount of electric power that is consumed is reduced.

Abstract: A system and method for signal channel balancing through accurate estimation of signal amplitude and phase parameters are described. The system includes multiple analog-to-digital (A/D) converter devices coupled to a digital signal processing (DSP) unit, each A/D converter device corresponding to a communication channel within the system. The system further includes multiple analog multiplexers, each analog multiplexer being coupled to a corresponding A/D converter device and having a number of inputs equal to the number of communication channels to be balanced within the system. The system further includes a timing generator circuit and selection logic coupled to the DSP unit, such that for each clock cycle, a single analog channel input is routed to each A/D converter device.

Abstract: Provided are a digital IF wireless transmitter, an RF modulator, and an RF modulating method.

Abstract: Circuit scale and power consumption of a base station is reduced with a feature of a sector-free configuration in routing processing. The feature is realized in a base station having transmitters corresponding to a plurality of sectors, as there are a switch distributing signals corresponding to a plurality of subcarriers to the plurality of sectors, respectively, and an inverse Fourier transform processor performing inverse Fourier transform processing on the signals for the plurality of sectors distributed by the switch, so as to supply to each corresponding transmitter among transmitters corresponding to the plurality of sectors.

Abstract: A radio communication apparatus for transmitting and receiving modulation signals of a plurality of channels in the same frequency band via a plurality of antennas. A communication method is based on information on electric wave propagation environment corresponding to each antenna of the communication partner and transmission is performed by selecting a transmission method for transmitting modulation signals of channels in the same frequency band from a plurality of antennas or a transmission method for transmitting a modulation signal of one channel from one antenna. Thus, it is possible to multiplex a plurality of modulation signals so as to be transmitted and to demultiplex and demodulate the transmitted multiplexed modulation signals at a reception unit, thereby improving the data transmission rate.

Abstract: Data transmitter embodiments are provided which are particularly useful as interface devices for accurate and reliable transmittal of data from high-speed data system devices such as analog-to-digital converters. Transmitter embodiments have been found to provide excellent fidelity of data transfer at high data rates (e.g., 4 gigabits/second) while consuming only a portion of the power of many conventional transmitters and requiring only a portion of the layout area of these transmitters. Transmitter embodiments provide effective control of transmitter parameters such as matched impedances, data symmetry, common-mode level, data eye and current drain.

Abstract: Aspects of a method and system for simultaneous signal transmission on multiple selected frequencies may include generating from a single baseband signal, a plurality of radio frequency transmission signals each at a different radio frequency, wherein the single baseband signal comprises an in-phase signal component and/or a quadrature signal component. The single baseband signal, to generate said plurality of radio frequency transmission signals, may be modulated in a single radio frequency transmission chain, the radio frequency transmission chain comprising intermediate frequency modulation and radio frequency modulation. The plurality of radio frequency transmission signals may be a radio frequency signal and a corresponding image frequency signal, based on the intermediate frequency modulation and the radio frequency modulation.

Abstract: A transmit amplifier stage operable to amplify a transmit signal comprises power amplifiers and switches. The power amplifiers include at least one full power amplifier operable to provide full power to amplify the transmit signal and at least one fractional power amplifier operable to provide fractional power to amplify the transmit signal, where the fractional power is a fraction of the full power. A switch has a plurality of positions, where a position directs the transmit signal to a selected power amplifier.

Abstract: An apparatus amplifies RF signals in a communication system by using a first directional coupler having at least two inputs and at least two outputs; at least two RF amplifiers, where an input of each RF amplifier is connected to a different one of the at least two outputs of the first directional coupler; and a second directional coupler having at least two inputs and at least two outputs, where each one of the at least two inputs is connected to an output of a different one of the at least two RF amplifiers. The at least two outputs of the second directional coupler are connected to at least two antennas, respectively.

Abstract: A system and related methods for introducing intra-channel spatial diversity within a multi-carrier wideband communication channel is presented. In accordance with one aspect of the present invention, developed more fully below, a method is presented comprising receiving information for transmission to a receiver, and generating a plurality of sub-carriers to redundantly transmit the information to a user over a multi-carrier wireless communication channel, wherein each of the sub-carriers is dynamically modified by a set of complex weights to ensure that each of the sub-carriers of the wireless communication channel propagates along a different physical path to the receiver.

Abstract: A communication device has a first communication section that supports a first communication mode having a low communication rate and a second communication section that supports a second communication mode having a higher communication rate than the first communication mode. The communication device includes a packet generation section and a communication control section. The packet generation section generates a first portion containing authentication information used for connection authentication for the second communication mode and a second portion other than the first portion. The communication control section performs control to cause the first communication section to transmit the first portion and to cause the second communication section to transmit the second portion after the connection authentication succeeds using the authentication information contained in the first portion.

Abstract: An apparatus that adaptively allocates transmission power for beam-forming combined with orthogonal space time block codes in a distributed wireless communication system, the apparatus including: sub-arrays for beam-forming, which are geographically distributed and each of which includes a plurality of distributed antennas placed in random groups. A central processing unit provides predetermined combinable power allocation schemes according to subsets in a plurality of the sub-arrays, identifying performances of the schemes by using information on large-scale fading of each of the sub-arrays fed back from a receiving party, setting a subset having best performance as an optimal subset according to the identified performances, and performing power allocation according thereto.

Abstract: A current steering mechanism is provided in a radio transmitter (e.g., a multiband radio transmitter) to provide compatibility with a variety of baseband parts. Different proportions of an input signal current (“in”) are steered to a dummy load, a mixer for a first band, and at least one other mixer for a second band. The mechanism is structured to selectively apportion a current input signal between multiple paths of the same polarity having respective load circuits and concurrently steer different proportions of the current input signal to a dummy load path and at least one mixer path.

Abstract: A method of transmitting data in a multi input, multi output (MIMO) system is disclosed. More specifically, the method includes selecting a primary antenna, based on satisfying at least one specified criteria, for transmitting a preamble, and transmitting the preamble via the primary antenna.

Abstract: Aspects of a method and system for channel estimation for interference suppression are provided. In this regard, one or more circuits and/or processors of a mobile communication device may generate and/or receive a first set of channel estimates and a second set of channel estimates. The one or more circuits and/or processors may modify the second set of channel estimates based on a comparison of a measure of correlation between the first set of channel estimates and the second set of channel estimates with a threshold. The first set of channel estimates and/or the modified second set of channel estimates may be utilized for cancelling interference in received signals. The first set of channel estimates may be associated with a first transmit antenna of a base transceiver station and the second set of channel estimates may be associated with a second transmit antenna of the base transceiver station.

Abstract: A method and an apparatus for using an Adaptive Modulation and Coding (AMC) scheme together with a method of controlling a transmitting power to increase a data transfer rate. The method of transmitting data in a transmitter including a plurality of antennas, includes receiving a Received Signal Strength (RSS) from a receiving portable terminal and determining whether data can be transmitted at the RSS; if the data cannot be transmitted at the RSS, integrating transmitting powers allocated to the plurality of antennas into one antenna to transmit the data when the data cannot be transmitted at the RSS; and transmitting the data using an AMC scheme when the data can be transmitted at the RSS.

Abstract: Provided is a low-complexity transmit/receive antenna selection method for Multi-Input Multi-Output (MIMO) systems. The method includes the steps of generating a gain matrix of receive channel, calculating norm values of channel gains for each row (receive antennas) and column (transmit antennas) of the generated gain matrix of the receive channel, selecting an antenna with the maximum norm value among the calculated norm values of channel gains, and repeatedly performing the process of alternately selecting transmit and receive antennas having the maximum channel gain value among the channel gain values of the selected antenna until a required number of antennas is all selected.

Abstract: Embodiments describe improved coupling of power amplifiers to antennas for the transmission of signals, such as OFDM signals. A large number of separate windings are utilized on a primary side, wherein each winding is for a different OFDM tone. Each OFDM tone may be amplified individually and combined as a results of transformer coupling. For example, the secondary side can have a single winding that combines the different OFDM tones.

Abstract: A novel out-phasing-array transmitter system and method are disclosed. The method is based on decomposing the input signal into an array of signals to drive a general, multiple paths out-phasing-array transmitter. This decomposition is less sensitive to the phase difference between the multiple paths, and extends the dynamic range of the out-phasing-array transmitter system. The wide dynamic range and the multiple transmission paths increase the maximum achievable output power, in accordance with the WiMAX specifications.

Abstract: Systems and methods for MIMO wireless transmission are provided. At the transmitter, a plurality of encoded packets are modulated, and the symbols are divided between several transmit antennas. The transmitter spreads some of the symbols of each packet using a respective subset of an available Walsh code space. A given transmit antenna then transmits part of each packet spread by the respective subset. In some implementations, this achieves the benefits of the PARC system, and at the same time achieves part of the benefits of the STTD system. Advantageously, only a single reverse link control channel is required if adaptive coding and modulation is to be performed.

Abstract: A wireless communication device may autonomously transition from a multiple antenna port mode to a single antenna port mode. The wireless communication device may implicitly notify a base station about the autonomous transition from the multiple antenna port mode to the single antenna port mode. The base station may reallocate resources that were previously allocated to the wireless communication device but that are no longer being used by the wireless communication device. In some cases, the base station may configure the wireless communication device's antenna port mode via radio resource control signaling.

Abstract: A communication device having an antenna tuned by a tank network at its input port to realize dual-band resonance. The antenna alone has a wideband but weak resonance, while the device antenna circuit with the tank network has a narrowband resonance between the two desired frequencies when the antenna is open-circuited. Together, the device antenna circuit with the tank network and antenna realize dual narrowband resonance at the two desired frequencies.

Abstract: A real-time/non-real-time/RF IC includes first and second baseband processing modules, an RF section, a wireline interface, and a bus structure. The first baseband processing module converts real-time outbound data into real-time outbound symbols and converts real-time inbound symbols into real-time inbound data. The second baseband processing module converts non-real-time outbound data into non-real-time outbound symbols and converts non-real-time inbound symbols into non-real-time inbound data. The RF section converts the real-time outbound symbols into real-time outbound RF signals, converts real-time inbound RF signals into the real-time inbound symbols, converts the non-real-time outbound symbols into non-real-time outbound RF signals, and converts non-real-time inbound RF signals into the non-real-time symbols. The wireline interface couples the non-real-time outbound data, the non-real-time inbound data, the real-time outbound data, and/or the real-time inbound data to an off-chip wireline connection.

Abstract: Wired and mobile cascaded communication systems and processors used in wired and wireless local area network (WLAN) and mobile systems with touch screen generated communication and control signal and position finding signals. Systems with distinct modulators for wired, WLAN and mobile systems operated in separate network and systems. The WLAN includes use of orthogonal frequency division multiplexed (OFDM) signal, the mobile communication system includes use of time division multiple access (TDMA) signal and Code Division Multiple Access (CDMA) signal. Cascaded communication system includes receiving, processing and transmitting a Bluetooth signal. Communication system and WLAN has non-linearly amplified amplifier and linearly amplified amplifier for signal amplification and transmission and non-quadrature modulator and a quadrature modulator. Quadrature modulator is used for modulation of TDMA or CDMA filtered cross-correlated in-phase and quadrature-phase baseband signals.

Abstract: A system and method for processing signals are disclosed. The method may include scrambling a first composite signal comprising N orthogonal sequences to generate a set of N channel signals. A second composite signal including M orthogonal sequences may be scrambled to generate a set of M channel signals. The M orthogonal sequences may be a subset of the N orthogonal sequences. The generated set of N channel signals and the generated set of M channel signals may be combined to generate K channel signals. K multiplexed channels may include the N channel signals and the M channel signals. The N channel signals may correspond to N antenna elements, and the M channel signals may correspond to M antenna elements. Each of the N channel signals may be spread utilizing a corresponding one of the N orthogonal sequences.

Abstract: A communication device for use in adapting an appliance to a computer network consistent with certain embodiments has a data transmitter that receives data to be transmitted and generates output signals carrying the data at a plurality of carrier frequencies. A user configurable notch filter, receives the output signals from the data transmitter, for reducing the amplitude of a user selected range of frequencies, and producing a filtered output. A network communication medium interface receives the filtered output and transmitting the filtered output over a network communication medium. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.

Abstract: A radio transmitting apparatus that has a plurality of antennas and changes the number of modulated signals transmitted simultaneously according to the propagation environment and so forth. A transmission power changing section 12 of a radio transmitting apparatus of the present invention adjusts the pilot symbol signal level so as to match the data symbol composite signal level according to the number of transmit modulated signals set by a modulated signal number setting section 11. By this means, the operating range of received pilot symbols and the operating range of received data symbols become approximately the same on the receiving side, enabling pilot symbol quantization error to be reduced. As a result, the precision of radio wave propagation environment estimation, time synchronization, and frequency offset estimation using pilot symbols improves, and consequently data reception quality improves.

Abstract: A communication system utilizing an adjustable link has at least a first data transmission circuit including at least a first communication link circuit. The first communication link circuit has a baseband circuit and at least a passband circuit. The baseband circuit corresponds to a baseband sub-channel and the passband circuit corresponds to a passband sub-channel. The first communication link circuit also includes a circuit that distributes a first subset of a data stream having a first symbol rate to the baseband circuit and a second subset of the data stream having a second symbol rate to the passband circuit. The baseband sub-channel and the passband sub-channel are separated by an adjacent guardband of frequencies. The passband carrier frequency is adjusted to define the guardband and the guardband corresponds to a first notch in a channel response of a first communications channel.

Abstract: According to one embodiment of the invention, a system and a method for maintaining a first history of strength of a first transmission path between a first wireless node and a second wireless node in a multiple input multiple output (MIMO) communication system, maintaining a second history of strength of a second transmission path between a third wireless node and the second wireless node in the MIMO communication system, performing a spatiotemporal correlation between the first history and the second history to determine if any changes in the strength of the first transmission path is observed, and predicting future changes to strength of the second transmission path between the third wireless node and the second wireless node based on the performed special correlation between the first history and the second history.

Abstract: Techniques to schedule downlink data transmission to a number of terminals in a wireless communication system. In one method, one or more sets of terminals are formed for possible data transmission, with each set including a unique combination of one or more terminals and corresponding to a hypothesis to be evaluated. One or more sub-hypotheses may further be formed for each hypothesis, with each sub-hypothesis corresponding to specific assignments of a number of transmit antennas to the one or more terminals in the hypothesis. The performance of each sub-hypothesis is then evaluated, and one of the evaluated sub-hypotheses is selected based on their performance. The terminal(s) in the selected sub-hypothesis are then scheduled for data transmission, and data is thereafter coded, modulated, and transmitted to each scheduled terminal from one or more transmit antennas assigned to the terminal.

Abstract: A reception device configured to receive a signal of a transmitted bit string transmitted from a transmission device which transmits a bit string includes: a receiving unit arranged to receive a signal from the transmission device and output a received bit string corresponding to the transmitted bit string; a storing unit arranged to store an error rate table wherein said received bit string is correlated with an error rate of post-data which is data of one bit or greater received following the received bit string being in error; and an error correcting unit arranged to perform error correcting of the post-data of the received bit string.

Abstract: Disclosed is an apparatus and method for adaptively allocating transmission power for beamforming combined with orthogonal space-time block codes (OSTBC) in a distributed wireless communication system, the apparatus comprising: a plurality of sub-arrays for beamforming, which are geographically distributed and each of which comprises a plurality of distributed antennas placed in random groups; and a central processing unit for identifying performances of subsets by applying a predetermined power allocation scheme according to subsets which can be obtained by combining the sub-arrays, by means of a Nakagami fading parameter and information about large-scale fading of each of the sub-arrays, fed back from a receiving party, for determining a subset having a best performance as an optimal subset according to the identified performances, and for performing power allocation based on the subset set as the optimal subset.

Abstract: A radio transmitter and method controls efficiency of each of a plurality of power amplifiers that amplify a corresponding one of a plurality of radio frequency signals for a beamforming transmission by a corresponding one of a plurality of antennas. Each of the plurality of power amplifiers is controlled to operate with one or more operating parameters that optimize the efficiency for an output power level of corresponding ones of the radio frequency signals. Transmit weights for transmit signals are determined and updated on a per-packet basis.

Abstract: A position finder and communication system processes signals received from multiple satellite and land based locations and generates processed position finder signal. A first cross-correlator and a transmit baseband filter generates cross-correlated in-phase and quadrature-phase processed filtered baseband signals from an input signal and a second cross-correlator generates cross-correlated in-phase and quadrature-phase processed spread spectrum signals. A processor processes data, voice or video signal into Orthogonal Frequency Division Multiplexed (OFDM) or into Orthogonal Frequency Division Multiple Access (OFDMA) processed data, voice or video signal. The processed position finder signal is further processed jointly with one or more of the signals generated by the first or second processed cross-correlated signal or with the processed OFDM or OFDMA signal and the jointly processed signal is provided to a quadrature modulator for quadrature modulation and transmission of the quadrature modulated signal.

Abstract: A control unit, in cooperation with an interface (IF) unit, a modulation unit and a baseband processing unit, produces a packet signal composed of a plurality of streams. While using as a reference a first known signal assigned to one of the plurality of streams and performing a cyclic timing shift within the first known signal on a first known signal assigned to another stream, the control unit performs a timing shift also on an extensional known signal assigned to a stream where no data is assigned. The amounts of timing shift are given degrees of priority beforehand and for the stream where data signals are assigned the control unit uses the amounts of timing shift in descending degree of priority. For the stream where no data signal is assigned, the control unit uses the amounts of timing shift also in descending degree of priority.

Abstract: An RF transceiver includes a plurality of RF receivers for receiving a corresponding one of a plurality of received signals. Each of the plurality of the RF receivers includes an AGC module that generates an automatic gain control (AGC) signal based on the strength of the corresponding one of the plurality of received signals, and a low noise amplifier that amplifies the corresponding one of the plurality of received signals based on the AGC signal. A processing module generates a transmit power control signal based on the AGC signals from each of the plurality of RF receivers. A plurality of RF transmitters each generate a corresponding one of a plurality of transmit signals having a selected power level, wherein the selected power level is based on the transmit power control signal.

Abstract: An integrated circuit (IC) includes a baseband processing module and a radio frequency (RF) section. The baseband processing module is coupled to convert outbound data or an outbound voice signal into at least one of amplitude modulation information, phase modulation information, and frequency modulation information. The RF section includes an oscillation module, a frequency divider, and power amplifier modules. The oscillation module produces an RF oscillation that it modulates based on the phase or frequency modulation information to produce a modulated RF signal. The frequency divider divides the frequency of the modulated RF signal to produce a frequency divided modulated RF signal. The first power amplifier module amplifies the modulated RF signal in accordance with the amplitude modulation information or a constant to produce a first frequency band outbound RF data or voice signal.

Abstract: The problem of being able to use in a practical way a single communication and remote control device, instead of requiring the use of multiple communication and multiple remote control devices for communication and automobile door opener and or ignition starters, is solved by this invention. A wireless signal is transmitted by cellular transmission, received and processed in an automobile for control of a door lock or control of ignition. Processed location finder, touch screen, time division multiple access (TDMA), Code Division Multiple Access (CDMA), orthogonal frequency division multiplex (OFDM) signals are provided for wireless transmission. Location finder Global Positioning System (GPS) signal and non GPS signals are received and processed. In addition to cellular system components, wireless local area networks (WLAN) and/or other wideband/broadband network devices, such as orthogonal frequency division multiplex (OFDM) transmitters and receivers are incorporated into the cellular devices.

Abstract: Systems and methods that provide antenna selection in multi-antenna-element communication systems are provided. In one embodiment, a system that selects N antenna elements in an M-antenna-element transmitter or an M-antenna-element receiver, in which N is less than M, may include, for example, M antenna elements in the M-antenna-element transmitter or the M-antenna-element receiver; N RF chains; and a switch coupled to the N RF chains. The M-antenna-element receiver may determine a bit error rate for each possible N antenna element subset of the M antenna elements. The M-antenna-element receiver may determine the particular N antenna element subset with a lowest bit error rate. In response to the determination of the particular N antenna element subset with the lowest bit error rate, the switch may couple the N RF chains to the particular N antenna element subset with the lowest bit error rate.

Abstract: Transmission of data from a portable communication device to a station via a radio frequency signal uses a protocol that has recurring frames, each having a plurality of transmission slots, different numbers of which can be used to transmit the data. When the portable communication device desires to send a data transmission, a first value is selected for either a power level for the radio frequency signal or the number of transmission slots to use. Then the first value is used to select a second value for the other one of the power level and the number of transmission slots. The first and second values are selected so that the data transmission at the selected power level using the selected number of transmission slots does not result in a specific absorption rate that is greater than a specific absorption rate limit.

Abstract: Disclosed is an adaptive transmit and receive method and device in a multiple-antenna wireless communication system. A transmit mode comprises different main transmit modes each of which includes one or both of a sub-transmit mode based on STBC and a sub-transmit mode based on SM. A receiver calculates an STBC performance parameter and a SM performance parameter, and a transmitter uses the parameters to determine a main transmit mode with maximum data rates and select a sub-transmit mode for minimizing power consumption. The transmitter channel-encodes, modulates and antenna-maps input data according to the selected transmit mode, and outputs results to the receiver. The receiver antenna/symbol-demodulates and channel-decodes the received data.

Abstract: A wireless communication system (40). The system comprises transmitter circuitry (42) comprising encoder circuitry (44) for receiving a plurality of symbols (Si). The system further comprises a plurality of antennas (AT1-AT4) coupled to the transmitter circuitry and for transmitting signals from the transmitter circuitry to a receiver (UST), wherein the signals are responsive to the plurality of symbols. Further, the encoder circuitry is for applying open loop diversity and closed loop diversity to the plurality of symbols to form the signals.