Abstract: A terminal device and a relay node selection method of the terminal device are described. The terminal device may sequentially compare a threshold value and an output signal to noise ratio (SNR) of a plurality of relay nodes based on a set test order, and select a relay node having an output SNR greater than the threshold value as a relay node to perform a cooperative communication.

Abstract: A T-SIR generation unit (106a) generates, on the basis of an actual reception quality (205) in a mobile communication terminal, a target value T-SIR to be used to control transmission power of a base station from the mobile communication terminal. When the mobile communication terminal exists in the service area of a predetermined specific communication carrier, a T-SIR correction unit (106b) adds a correction value K to the T-SIR generated by the T-SIR generation unit (106a). Even when a reception SIR abruptly deteriorates in a communication carrier with a strong reception field and a low BLER, it does not drop below the SIR limit value of the mobile communication terminal. Hence, the terminal can receive the signal from the base station and continue a service such as speech communication. When a long-term BLER measurement result is used instead of a BER, stable transmission power control can be done normally.

Abstract: A radio frequency transceiver (102), including a transmitter (104), a duplexer (108) and a direct-conversion receiver (106) including a mixer (140 and 141). An IIP2 calibration system (170), coupled to the transceiver, includes an IIP2 coefficient estimator (172) for calculating an estimate of second-order distortion intermodulation distortion, and an IIP2 controller (174) for adjusting an IIP2 tuning port of the mixer in the receiver to minimize second-order distortion intermodulation distortion in the receiver that may be caused by the receiver receiving a transmit RF signal leaking through the duplexer.

Abstract: A signal received via a plurality of antennas, and containing an interference component and a desired communication component, is processed to suppress the interference component. The interference component is suppressed based on an inverse of a spatial covariance matrix, which inverse is produced without performing a matrix inversion operation.

Abstract: A method of detecting a received signal, which is received by a receiving side of a communication system, is disclosed. The present invention includes comparing signal quality relevant information of the received signal to a prescribed reference value, selecting a pre-processing scheme to be applied to the received signal according to a result of the comparing step, and detecting a signal by applying the selected pre-processing scheme to the received signal. Thus, a pre-processing scheme for received signal detection can be differently applied according to a size of quality relevant information of a received signal. Accordingly, the present invention lowers a false alarm probability and/or a miss occurrence probability of the received signal, thereby raising a signal detection probability.

Abstract: An estimation method is provided for use in a receiver of an OFDM (orthogonal frequency division multiplexing) system to estimate the ICI (inter-carrier interference) and the noise power of a channel. Two pilot signals respectively carried by two subcarriers are received from the channel wherein the two pilot signals are adjacent and differ by a first phase angle. Another two pilot signals respectively carried by another two subcarrier are received from the channel wherein the another two pilot signals are adjacent and differ by a second phase angle. According to some embodiments of the invention, these phases are correlated with the ICI power, but are uncorrelated with the noise power. The estimation method then individually estimates the ICI power and noise power according to the first phase and the second phase.

Abstract: A criterion for biasing a binary decision requiring an unequal protection which utilizes a measured signal to interference ratio (SIR). The SIR may be derived from a determination of channel estimation. The SIR is compared against a threshold, the threshold being selected to bias the decision toward a not acknowledge (NACK) as opposed to an acknowledge (ACK) determination. The technique is advantageous for providing biased binary decisions for high speed downlink packets (HSDP) but may be utilized for both uplink and downlink applications.

Abstract: A method and apparatus to improve adaptation speed of a digital receiver is presented. The receiver includes an equalizer to initiate adaptation to a transmission channel responsive to a first control signal, a slicer coupled to the equalizer to generate symbol decisions based at least in part on an equalized digital signal, logic to receive the symbol decisions and generate a selection signal when a lock onto a training sequence of the symbol decisions occurs, first and second phase detectors to detect phase errors of the equalized digital signal and an incoming digital signal, respectively, and a clock generator to generate a clock signal responsive to one of the first and second phase errors.

Abstract: Apparatus, and an associated method, for a receiving station, such as the receive part of a mobile station, that has diversity antennas. The receiving station includes both legacy demodulators and a diversity demodulator. Calculations are made to determine signal indicia associated with the signal energy detected at the diversity antennas. Responsive to the signal indicia, selection is made as to whether to utilize demodulation data, demodulated pursuant to a diversity demodulation technique or pursuant to a legacy demodulation technique. As the characteristics of received signals change, reselection of the demodulation is correspondingly made, such as on a frame-by-frame basis of frame-formatted data.

Abstract: Provided is an apparatus and method for enhancing a demodulation performance of a receiver in a Broadband Wireless Access (BWA) system. A receiving apparatus in a broadband wireless communication system includes an estimator, a first calculator, and a second calculator. The estimator estimates a desired signal. The first calculator calculates a correlation matrix of a signal obtained by eliminating the estimated desired signal from a Received (RX) signal. The second calculator performs an interference elimination using the correlation matrix.

Abstract: During a communication, the radio connection quality is measured so as to detect and store a generation time, an end time, and a continuation time of quality degradation. Upon a communication end, the end cause is judged. If the communication end is caused by a user operation, a causal connection between the communication end and the quality degradation is judged according to temporal relationship between the generation time of the quality degradation and the communication end time. That is, it is judged whether the communication end caused by the user operation is a phenomenon that the user has terminated the communication because of the communication quality degradation or other reason. Thus the communication end reasons are divided into at least two types and accumulated.

Abstract: An asynchronous receiver system has multiple antennae and an asynchronous receiver circuit with a signal input. The asynchronous receiver circuit receives a wireless signal at the signal input and generates a first quality signal responsive to the received wireless signal. A switch selects one of the antennae for coupling to the input of the asynchronous receiver circuit responsive to a control signal. A controller receives the first quality signal and generates the switching control signal. The controller sequentially selects each one of the antennae, measures the first quality signal and starts a timer with a time value for the selected antenna. The controller selects a next one of the antennae if the measured first quality signal value is below a threshold value and the timer expires and receives a remainder of a data packet based on the measured first signal quality values for the plurality of antennae.

Abstract: A mobile communication system (100) includes an infrastructure (121) including at least a first base transceiver station (123) and a plurality of mobile stations (101, 103), wherein each of the mobile stations is operable to detect interference by jamming to a signal sent on a downlink channel by the first base transceiver station and, when it determines that such interference exists, to send a notification message to the infrastructure.

Abstract: An apparatus and method for removing an interference signal using a selective frequency phase converter are disclosed.

Abstract: A receiver includes a plurality of RF receiver modules, a plurality of analog baseband sections, a plurality of analog to digital conversion sections, and a digital baseband processing module. The RF receiver modules convert inbound RF signals into a plurality of inbound analog signals. When the receiver is in a first mode, one of the plurality of analog baseband sections is active to adjust one of the plurality of inbound analog signals to produce an adjusted inbound analog signal; one of the plurality of analog to digital conversion sections converts the adjusted inbound analog signal into an inbound digital signal; and a portion of the digital baseband processing module is active to convert the inbound digital signal into inbound data.

Abstract: There is provided a receiving apparatus having a simple configuration and an excellent ability to eliminate multipath noise, in which an antenna in a good reception state can be instantly selected. A reception signal from an antenna is inputted to an intermediate-frequency amplifying circuit via an antenna switching circuit, a front end and an A/D converting circuit, and an S meter signal from an S meter circuit is inputted to a controlling section via a noise detecting filter and an absolute value circuit. Then, the controlling section compares noise components outputted from the absolute value circuit (noise level) with a threshold value Vth outputted from a threshold value setting section. When the noise level becomes higher than the threshold value Vth, an antenna selection controlling signal is outputted to the antenna switching circuit, and antennas are switched.

Abstract: A method for transmitting multicast data in a WiMax/WiBro relay system, including transmitting carrier-interference-noise ratios from UEs to corresponding Relays; selecting the minimum value among the carrier-interference-noise ratios; determining the modulation and coding mode according to the selected minimum value; transmitting the modulation and coding mode to BS; selecting a modulation and coding mode with a highest rate for multicast data on an access link; transmitting the final modulation and coding mode to the Relays; and transmitting data via the access link with the modulation and coding mode determined by the BS.

Abstract: A method and apparatus for correcting direct current (DC) offset errors of a received signal in a direct conversion receiver (DCR) are provided. DC offset correction algorithms are incorporated into the DCR, each algorithm being optimized for a particular receive signal operating environment. The DC offset correction algorithms remove DC offset errors in baseband In-phase and Quadrature-phase signals received within the direct conversion receiver baseband signal path. Individual DC offset correction algorithms are selected for use as determined by a signal quality estimator component. A DC offset correction component of the direct conversion receiver determines an appropriate DC offset correction algorithm suited for a particular operating environment. A criterion for a signal quality estimate is set to control transitioning between DCOC algorithms.

Abstract: A method and system for enhancing speech intelligibility using wireless communication in portable, battery-powered and entirely user-supportable devices. The devices may be talker devices and receiver devices, where the audio signals input into the talker devices may be transmitted to the receiver devices to provide better quality audio to person using the receiver devices. The receiver devices may initiate and terminate communications with the talker devices. Additionally, the receiver devices may indicate to the talker devices the gain level the talker devices need to apply to the audio signals before sending them to the receiver devices.

Abstract: A channel quality indicator value is determined on a per transport block basis. A signal-to-interference ratio estimate of a control channel and a channel quality estimate of user-data channel are employed in the determination of the channel quality indicator. The channel quality estimate of the user-data channel can include information about Automatic Retransmission Request (ARQ) processing, and the number of iterations of a Turbo decoder. Additionally, information about the Cyclic Redundancy Check (CRC), which is determined on a per transport block basis, can be employed in the channel quality indicator determination. The determined channel quality indicator is reported to the radio communication system.

Abstract: A communication device selects an optimal modulation method even when a propagation path condition is changed. In the communication device, a second communication device has a transmission path condition estimation unit for estimating the propagation path condition change speed and a communication quality estimation unit for modifying the communication quality estimation method according to the speed of the change of the propagation path condition and for estimating the communication quality according to the modified estimation method. The information on the estimated propagation path condition and the information on the communication quality are transmitted from a transmission processing unit, and an adaptive modulation control unit of the first communication device sets a condition for selecting the modulation method and decides the modulation method according to the set condition and the information on the communication quality.

Abstract: Methods, systems, and apparatuses are presented for improved satellite communications. The satellite system may comprises at least one gateway, a satellite in orbit configured to communicate with the at least one gateway and provide a plurality of spot beams, and a plurality of subscriber terminals. The spot beams may include a first spot beam to illuminate a first region and a second spot beam to illuminate a second region adjacent to and overlapping with the first region. The first spot beam as sent to at least one subscriber terminal may be affected by (1) interference from other signal sources including the second spot beam at a signal-to-interference ratio C/I and (2) noise at a signal-to-noise ratio C/N. Reception of signals from the first spot beam by the at least one of the first plurality of subscriber terminals may be interference-dominated such that C/I is less than C/N.

Abstract: Apparatus, and an associated method, for a receiving station, such as the receive part of a mobile station, that has diversity antennas. The receiving station includes both legacy demodulators and a diversity demodulator. Calculations are made to determine signal indicia associated with the signal energy detected at the diversity antennas. Responsive to the signal indicia, selection is made as to whether to utilize demodulation data, demodulated pursuant to a diversity demodulation technique or pursuant to a legacy demodulation technique. As the characteristics of received signals change, reselection of the demodulation is correspondingly made, such as on a frame-by-frame basis of frame-formatted data.

Abstract: A recursive method of calculating an inverse impairments matrix is used to generate an SINR estimate, which in turn is used to generate a CQI estimate. The recursive inverse impairments matrix calculation avoids the need to perform a computationally intensive matrix inversion, allowing for faster CQI estimate generation and consuming less power.

Abstract: Provided is a method of selecting an algorithm in a wireless receiver which supports a plurality of algorithms, more particularly, a method of selecting a suitable algorithm which is adaptive to changes in channel environment and satisfies requirements of applications, using information which is available in the wireless receiver. The algorithm selection method includes: calculating a measure value for selecting an algorithm on the basis of information obtained from the wireless receiver; comparing the measure value with at least one threshold value, and selecting an algorithm that is to be applied to a received packet, from among the plurality of algorithms, according to the result of the comparison; and decoding the received packet using the selected algorithm, wherein the at least one threshold value is adaptively updated on the basis of the information obtained from the wireless receiver.

Abstract: This disclosure discloses methods and apparatus for calibrating received signal strength indicators.

Abstract: A mixed-signal chip is described. The mixed-signal chip comprises a first portion of analog circuit and second portion of digital circuit, an on-chip precision oscillator residing on the first analog portion, the precision oscillator has a precision frequency; a first on-chip non-precision tunable oscillator from a first clock domain residing on the first analog portion, the first non-precision tunable oscillator has a first adjustable frequency; a noise detector for detecting a first noise in the first clock domain; a frequency adjusting register for storing a first desired frequency value of the first on-chip non-precision tunable oscillator, wherein the first desired frequency value is determined based on the first detected noise; a control circuit for adjusting the adjustable frequency of the first non-precision tunable oscillator to the first desired frequency value by using the precision frequency of the on-chip precision oscillator as a reference.

Abstract: A diversity receiver includes a first radio frequency (RF) receiver section receives a first inbound RF signal over a range of frequencies and generates a first amplified RF signal, wherein the first inbound RF signal includes a desired RF signal component and an undesired signal component. A second RF receiver section receives a second inbound RF signal over the range of frequencies and generates a second amplified RF signal, wherein the second inbound RF signal includes the desired signal component and the undesired signal component. A first RF cancellation module generates a desired RF signal from the desired RF signal component while attenuating the undesired signal component, based on the first amplified RF signal and the second amplified RF signal.

Abstract: A method of rate shifting specially suited for the voice traffic, which differentiates poor channel conditions from a heavily loaded channel of a WLAN and adapts to the network traffic condition and channel condition promptly with low rate of false shifting. Determining when to rate shift is based on a combination of the received signal strength indication and the retry rate.

Abstract: A number of RF receivers are connected in a network. The network is used to transmit communications, data, or both to and from the RF receivers and to synchronize the RF receivers to a common time. Digitized RF data is time-stamped and stored in memory. A trigger circuit in one or more RF receivers determines whether a trigger criterion or criteria has been met. When a trigger criterion or criteria has been met, some or all of the RF receivers in the network transmit select digitized RF data to a central processing device. The central processing device processes the select digitized data to detect if a signal is present.

Abstract: A method and apparatus for providing service availability information includes receiving a signal transmitted from a base station. A power level and interference level of the received signal is measured and an estimate of a power level of each potentially available service based on the power level of the received signal and predetermined power offsets associated with each of a plurality of potentially available services is derived. An estimate of a signal-to-interference ratio (SIR) for each potentially available service from the estimate of a power level of each service and the measured interference level and a service availability indicator for each potentially available service by dividing the estimated SIR with a target SIR are calculated. Service availability indicators for each potentially available service are outputted.

Abstract: A mobile phone includes a controller; a receipt adjusting unit for controlling receipt of the (RF) radio frequency signal and controlling receipt diversity under control of the controller; a first RF signal receiver for converting the RF signal received through the first antenna into a baseband signal to be transmitted to the controller under control of the receipt adjusting unit; a second RF signal receiver for converting the RF signal received through the second antenna into a baseband signal to be transmitted to the controller under control of the receipt adjusting unit; a transmission diversity adjusting unit for controlling transmission diversity under control of the controller; and an RF signal transmitter for converting the baseband signal transmitted from the controller into an RF signal to be transmitted to the first antenna and transmitting the RF signal to the second antenna under control of the transmission diversity adjusting unit.

Abstract: A multiple-input, multiple-output (MIMO) communication system is configured to perform user scheduling and associated precoding. The system includes multiple terminals and at least one base station configured to communicate with the terminals. The base station is operative to obtain channel vectors for respective ones of the terminals, to select a subset of the terminals based on magnitudes of the respective channel vectors, to compute a precoding matrix using the channel vectors of the selected subset of terminals, and to utilize the preceding matrix to control transmission to the selected subset of terminals. The system may be, for example, a time-division duplex (TDD) multi-user MIMO system in which the multiple terminals comprise autonomous single-antenna terminals.

Abstract: A method and apparatus is provided for securing a quality of service of packet data service provided in a communication system by enabling mobile terminals that receive the packet data service in the RRC-idle mode to provide information to the network regarding the quality of the received service. A mobile receiving a specific service, for example MBMS, may provide information related to the quality of the received service or the results of measurements performed to determine the quality of the received service to a network via a common control channel either in response to a measurement request from the network or if the mobile terminal determines that the quality of the received service is below a minimum quality of service to be secured.

Abstract: A criterion for biasing a binary decision requiring an unequal protection which utilizes a measured signal to interference ratio (SIR). The SIR may be derived from a determination of channel estimation. The SIR is compared against a threshold, the threshold being selected to bias the decision toward a not acknowledge (NACK) as opposed to an acknowledge (ACK) determination. The technique is advantageous for providing biased binary decisions for high speed downlink packets (HSDP) but may be utilized for both uplink and downlink applications.

Abstract: A transmitter/receiver 101 on a mobile body 10 utilizes a plurality of antennas 100. It is assumed that a plurality of the antennas 100 are distributed and arranged in a moving direction of the mobile body, and the antennas at both ends are away from each other at an extent that a distance between the antennas is not negligible as compared with an interval of the base station. A radio wave from the base station 102-1 is stronger in intensity in 100-1 than in the center, and the radio wave from the base station 102-2 is stronger in intensity in 100-2 than in the center, respectively, whereby the communication stabilization effect, which is larger as compared with the case that the antennas are locally located in the center, is expected.

Abstract: On transition of a 1x system from a standby state in which standby processing is performed to out of service state in an SHDR mode, the standby processing for the 1x system using a receiver unit (RX1) is halted and, when an instruction to switch from a call through an EVDO system using a transmitter-receiver unit (RX0/TX) and/or the receiver unit (RX1) to a call through the 1x system using the transmitter-receiver unit (RX0/TX) during the halt state is detected, a system detection process for detecting the 1x system is performed by using the receiver unit (RX1).

Abstract: A node (5) for use in a cellular network (4) to control the transmission of data from a radio base station (3) in the cellular network to a mobile terminal (1), is proposed, said node (5) comprising memory (7) for storing a channel quality value reported by the mobile terminal, and acknowledgement messages received from the mobile terminal, and calculating means (9) for calculating an adjustment value for the channel quality value based on the acknowledgement messages. The calculating means (9) is arranged to calculate said adjustment value for the perceived channel quality value taking into account at least two responses related to at least two blocks, and calculate said adjusted value using the adjustment value. The evaluation may be based on consecutive acknowledgement messages or on statistics derived from a plurality of messages.

Abstract: A transceiver includes a receiver configured to receive a radio frequency (RF) signal via a wireless communication link. The wireless link has a predetermined link characteristic. The RF signal includes a plurality of encoded Orthogonal Frequency Division Modulation (OFDM) symbols. A receive baseband processor recovers each OFDM symbol encoded within the RF signal. The baseband processor includes an estimation unit configured to continuously measure a signal quality of the wireless communication link based on each recovered OFDM symbol. A MAC layer controller is configured to selectively alter the predetermined link characteristic of the wireless link on an ongoing basis based on the continuously measured signal quality of the wireless communication link.

Abstract: A high-speed receiver includes multiple receiver components. Each receiver component includes sampling latches for receiving data, phase rotators for controlling timing of sampling of data by the sampling latches, and a clock-tracking logic stage for providing clock and data recovery. The clock-tracking logic stage is divided into a high-speed early/late (E/L) logic and aggregation counter section and a low-speed logic section, separated by a synchronization logic block. The receiver also includes a delay locked loop (DLL) for receiving an input clock signal corresponding to a data rate of the received data, providing coarse delay adjustment of the clock signal and outputting multiple clock phase vectors corresponding to the adjusted clock signal to the phase rotators on each receiver component. The phase rotators control sampling of the data based on the clock phase vectors received from the DLL. A single regulated power supply regulator regulates power supplied to the DLL and the phase rotators.

Abstract: An apparatus and method for controlling amount of information to be fed back in a multiple antenna system in a multi-user environment. The apparatus includes a channel estimator which estimates channel values by using an input signal; a Singular Value Decomposition (SVD) operator which decomposes singular values from the estimated channel values; and a feedback determining unit which uses the singular values to compute channel capacity that can be obtained according to the amount of channel information to be fed back, and selects the channel information to be fed back by using the channel capacity.

Abstract: A wireless signal processor for use in identifying a maximum Carrier to Noise Interference Ratio (CINR) associated with a plurality of received OFDMA subcarriers has a candidate generator for forming a plurality of candidate values from a particular set of received subcarriers by forming candidate values based on the received subcarriers in combination with possible integer preamble offsets and possible preamble values. A candidate evaluator selects which of the possible preamble values and integer frequency offset values have the maximum CINR, and provides the maximum CINR with IFO and preamble index as outputs.

Abstract: Systems and methods are presented for measuring power levels of primary and interfering signals as well as noise, particularly for satellite transmitted signals. A typical method comprises the steps of receiving a signal comprising a primary signal, an interference signal and noise, demodulating the primary signal to remove a carrier frequency, decoding the primary signal to obtain symbols, estimating a power level of the primary signal based upon the demodulated and decoded primary signal. Additionally, an ideal primary signal can be generated from the carrier power and frequency and the symbols and subtracted from the received signal to produce the noise and interference signal. The noise and interference power is then estimated from the noise and interference signal.

Abstract: A front-end architecture and processing method for a receiver in a multi-antenna, multi-band radio. Band-dependent components for multiple frequency bands are not duplicated in each receive chain. In one embodiment, a first receive chain includes band-dependent components for the first frequency band only. A second receive chain includes band-dependent components for the second frequency band only. The receive chains may be dedicated to particular antennas, or a switch may be utilized to route signals from different antennas to the different band-dependent components. Each receive chain may include band-independent components, or a single set of band-independent components may be utilized for the different receive chains by multiplexing the output of the band-dependent component sections.

Abstract: Complex antennas weights for use in beamforming in a multiple-antenna system are determined based upon clear channel assessment (CCA) information in a wireless networking environment.

Abstract: An antenna structure includes first and second antennas. The first antenna has a first geometry corresponding to a first frequency. The second antenna has a second geometry corresponding to a second frequency. The second antenna is proximal to the first antenna and utilizes electrical-magnetic properties of the first antenna to transceive signals at the second frequency.

Abstract: Improved serving sector selection mechanisms are provided which convey sector load information to a wireless communicator. The wireless communicator can use carrier-to-interference (C/I) ratio measurements and sector load information for each of its Active Set (AS) sectors (or all sectors in its Active Set (AS)) to determine the best serving sector.

Abstract: Disclosed are the design and implementation of a CSI feedback channel in a multi-carrier wireless communication system. An apparatus and a method for channel state feedback using arithmetic coding are provided to ensure efficiency and reliability of a system by transmitting the CSI while compressing the CSI with a predetermined compression rate selected depending on a channel state. The apparatus for CSI feedback in a wireless communication system performing channel estimation at a transmitter or a receiver by using a communication channel includes a transmitter terminal transmitting a signal for CSI measurement by using the communication channel, and a receiver terminal receiving the signal from the transmitter terminal, checking a channel state based on the received signal, and transmitting the signal to the transmitter terminal after compressing the signal according to the channel state.

Abstract: A method and apparatus for operating a radio reception system, which comprises a plurality of receivers assigned to a common output device, in which one of the receivers is designated as audio receiver and is tuned to a frequency of a radio transmitter, and outputs a signal received from the transmitter to the output device. At least one second receiver is designated as search receiver, and continuously searches its own reception frequency band for a frequency of the same transmitter. The system changes to a frequency of this transmitter, which was found by the search receiver, if the quality of the signal received by the audio receiver falls below a certain limit.

Abstract: A MIMO wireless system includes a transmitter having a parser that parses a bit stream into multiple spatial data streams and multiple interleavers corresponding to the multiple spatial data streams, where each interleaver interleaves the bits in the corresponding spatial data stream by performing multiple column rotations and row rotation, to increase diversity of the wireless system. The MIMO wireless system also includes a receiver that has deinterleavers that deinterleaves spatial bit streams transmitted by the transmitter.