Abstract: An improved radio frequency receiver and method enabling the dynamic range of a radio frequency receiver to be extended are disclosed. In the receiver system, the effective received channel power is a combination of the wanted signal level, the noise floor and any in band spurious signals generated from blocking signals present at the input to the receiver system. When this total effective channel power is known, the front end gain is optimized by adaptively minimizing the total effective channel power. Since the wanted input signal power does not vary with the receiver gain setting, this optimizes the noise figure and input intercept point for the presented input signal conditions.

Abstract: Signals propagating on an aggressor communication channel can cause detrimental interference in a victim communication channel. A signal processing circuit can generate an interference cancellation signal that, when applied to the victim communication channel, cancels the detrimental interference. The signal processing circuit can dynamically adjust or update two or more aspects of the interference cancellation signal, such as an amplitude or gain parameter and a phase or delay parameter. Via the dynamic adjustments, the signal processing circuit can adapt to changing conditions, thereby maintaining an acceptable level of interference cancellation in a fluctuating operating environment. A control circuit that implements the parametric adjustments can have at least two modes of operation, one for adjusting the amplitude parameter and one for adjusting the phase parameter. The modes can be selectable or can be intermittently available, for example.

Abstract: A method and a device for controlling uplink/downlink power for radio communication is disclosed. The method includes receiving a radio communications signal in a radio receiver, estimating one or more parameters indicative of the transmission quality of the received radio communications signal based on power control information bits and pilot symbol bits in the radio communications signal, and generating a control signal for the radio receiver and/or the radio transmitter.

Abstract: The present invention relates to a broadcast signal receiver comprising a low noise amplifier for receiving an RF signal and selectively amplifying the received RF signal; a tuner for tuning the RF signal selectively amplified by the low noise amplifier to a predetermined channel; a signal analyzer for demodulating a signal output from the tuner and calculating a signal-to-noise ratio of the demodulated signal; and a controller for determining the strength of the signal output from the tuner, and controlling a selective amplifying operation of the low noise amplifier on the basis of the determined signal strength and the signal-to-noise ratio. Thus, the present invention provides a broadcast signal receiver and a control method thereof, which prevents poor picture quality when the LNA is turned on due to the RF signal having a weak electric field.

Abstract: ICI canceling in an OFDM system includes taking a FFT of a wireless electrical signal to produce an OFDM signal; estimating a DC component of a frequency-selective channel in the OFDM system; obtaining an initial estimate of data symbols associated with data bits of the OFDM signal; correcting the data bits with a Viterbi decoder; encoding the corrected data bits to acquire corrected data symbols; re-estimating the DC component of the frequency-selective channel using the corrected data symbols; filtering the corrected data symbols and sub-carrier of the frequency-selective channel; calculating a first order differential function of the frequency-selective channel based on successive ones of the corrected data symbols; removing an ICI component from the calculated first order differential function; and re-estimating the data symbols as a function of the removed ICI component. The filtering occurs using a low pass filter comprising a bank of eight filters.

Abstract: Systems and methods for providing active noise cancellation in an RFID tag reader are described. In one aspect, the method features increasing the signal-to-noise-plus-interference ratio of a radio frequency tag response. The method includes receiving, with a first antenna element of a radio frequency tag reader, a radio frequency tag response having a noise-plus-interference portion and a response portion, receiving a noise-plus-interference signal with a second antenna element of the radio frequency tag reader, and processing the received radio frequency tag response and the noise-plus-interference signal to increase a signal-to-noise-plus-interference ratio of the received radio frequency tag response.

Abstract: A frequency modulation (FM) radio receiver includes a processing unit that may generate a magnitude value corresponding to a signal strength of each of a plurality of digital samples of a received FM signal. The receiver also includes a noise estimation unit that may filter the magnitude values using a high pass filter and may generate a noise value representative of a noise portion of the received FM signal based upon the filtered magnitude values.

Abstract: A demodulation circuit can perform a capturing operation although a frequency error is large. A phase comparator out puts a predetermined value other than 0 as a determination result of a phase error when a phase error of a carrier wave is large and a signal point is located at a predetermined position. A loop filter outputs a negative minimum value to an integrator when an integrated value of a determination result reaches a positive maximum value of a limiter. Thus, when a phase error is large, a value changing from a negative minimum value to a positive maximum value is output from the loop filter, thereby realizing a broad synchronous capture range.

Abstract: A FM receiver comprises an IF filter, a demodulator and a decoder. The IF filter generates an RSSI and a FM modulated signal in response to a FM signal. The demodulator comprises a duty-to-voltage amplifier for amplifying a peak of a MPX signal. The duty-to-voltage amplifier comprises a current source, a switch and a current splitter. The current source generates a current. The switch controls a flow of the first current in response to a PWM signal. The current splitter splits the flow of the current into a sub-flow in response to the RSSI. The peak of the MPX signal is proportional to the sub-flow. The decoder receives the MPX signal to generate an audio signal to play sound.

Abstract: The present invention relates to an interference cancellation receiving method in an OFDMA mobile communication system, and an apparatus using the same. For this purpose, the present invention provides an interference cancellation receiving method for outputting a data symbol from which an interfering signal is canceled by receiving subcarriers including a data signal from a serving base station, the data signal including interfering signals from a neighboring base station and a remote base station, estimating a channel response of the serving base station and the neighboring base station by using at least one adjacent pilot subcarrier in the frequency axis or time axis, computing a weight value for canceling the interfering signals, and combining at least one data subcarrier having a repeated identical data symbol among received subcarriers with the weight value.

Abstract: An integrated circuit radio transceiver and method therefor comprises a receiver front end that further includes a plurality of in-phase and quadrature phase receive processing block operable at first and second frequency bands wherein each of the receive processing blocks defines an ingoing signal path and further includes a plurality of filtering and amplification blocks disposed within the corresponding ingoing signal path, a plurality of RSSI blocks coupled to receive an ingoing analog signal from a corresponding plurality of nodes disposed throughout the ingoing signal path, each of the plurality of received signal strength indicator blocks producing a signal strength indication, and wherein a baseband processor is operable to receive a selected signal strength indication and to produce at least one gain setting to at least one amplification block within the in-phase or quadrature phase receive processing blocks.

Abstract: A receiver device comprising: a frequency hopping radio receiver for operation according to a frequency hopping radio protocol and arranged to detect the presence of interference characteristic of a predetermined other radio protocol; and a user-alerting unit responsive to the receiver; the receiver device being configurable to actuate the user-alerting unit for alerting a user in response to the detection of interference characteristic of the other radio protocol.

Abstract: The effects of interference are mitigated in a wireless system through update noise variance estimates. Noise variance estimates may be update after the reception of a preamble in an OFDM receiver. Noise variance estimates may include averages of signal energy over multiple symbols in one OFDM tone and over multiple OFDM tones. A co-located wireless personal area network (WPAN) interface may signal its presence a wireless local area network (WLAN) interface, which may select a noise variance estimate algorithm based therein.

Abstract: Method and device for interference cancellation. A radio access unit comprises a plurality of directionally separated antenna elements (41k, K=1, 2, . . . , L) for receiving signals transmitted by a plurality of remote units. From signals received by each of the antenna elements (41k) first weighing factors (g(1)k) are determined (49), for optimally selecting signal of a first remote unit (521). A first radio signal (s1) of the first communication unit (521) is provided by weighing (44) the received signals using the first weighing factors (g(1)k). For a further radio communication unit (52i) further weighing factors (g(i)k) are determined. A corrected further radio signal (s?i) is provided each time by subtracting (46) from the further radio signal (si), previously obtained corrected radio signal (S?i-1, S?i-1, . . . ) weighed by the further weighing factors (g(i)k), till a stop criterium has been satisfied.

Abstract: A method and apparatus for generating a signal to noise ratio (SNR) estimate. A conditional probability distribution function (CPDF) is rectified to suppress the condition, thereby creating a biased CPDF. Conditional offset moments are computed through an analysis of the asymmetry generated by the rectification. The conditional offset moments are then utilized to reduce the bias generated by the rectification to enhance the SNR estimate.

Abstract: A self-test prediction system predicts the impact that a host device has on an embedded wireless device's receiver performance by recording the wireless device's received power. No carrier or pilot signal is necessary to predict the impact. The wireless device's embedded receiver monitors its own received power (e.g., RSSI) from any type of radiated noise from the host device. For receivers that do not provide RSS referenced to absolute power, an external reference tone can be used in order to scale the measured receiver carrier to noise or signal to noise data to an absolute power. The increase in measured received power on the wireless device's receiver correlates to the impact the host device will have on the embedded wireless device's receiver sensitivity performance, providing a faster approach with less external equipment than current approaches that use external equipment to simulate the wireless device's forward link signal.

Abstract: The invention is an electronic circuit for testing a receiver. In detail, the circuit includes a RF signal generator providing an RF signal to a first mixer. A first oscillator providing a first signal to the first mixer. The first mixer receives the RF signal and the first signal and provides a first output signal comprising the RF signal plus the first signal and the RF signal minus the first signal. A first filter is coupled to the first mixer for receiving the first output signal and providing a second output signal wherein the RF signal plus the first output signal is removed. A second mixer is coupled to the first filter and is adapted to receive the second output signal and a second input signal from a second oscillator; and provides a third output signal to a second filter. A fourth output signal from the second filter provides a fifth output signal for testing the receiver that is amplitude and temperature insensitive.

Abstract: In a method of multipath acquisition for a dedicated traffic channel, path positions of the traffic channel that have desired signal energy for processing in a base station receiver may be determined as a function of pilot signal information and other control information contained in a control part of the traffic channel.

Abstract: Techniques for estimating data-to-pilot ratio are described. A terminal may receive pilot sent to multiple terminals and may receive data sent specifically to the terminal. The terminal may estimate channel gain and noise variance based on the received pilot. The terminal may then estimate a data-to-pilot ratio based on the received data y and the estimated channel gain h and noise variance ?2. In one design, the terminal may determine a metric ? y ? 2 - ? 2 ? h ? 2 and may average the metric across multiple received data symbols to obtain the data-to-pilot ratio. The terminal may receive pilot and data via multiple antennas and may combine the received data across these antennas to obtain combined data. The terminal may estimate signal-to-noise-and-interference ratio (SINR) based on the received pilot from the multiple antennas and may then estimate the data-to-pilot ratio based on the combined data and the estimated SINR.

Abstract: According to an aspect of the present description a method for determining selected parameters of a noise characterization equation which describes a noise performance of a device as a function of a controllable variable of the device is provided. The method includes selecting a number of different values of the controllable variable of the device, the number of different values being equal to or larger than the number of parameters that are to be determined; measuring the noise performance of the device for the different values; utilizing the noise characterization equation to set up a number of independent relations which relate the parameters with the measurement results, the number of independent relations being equal to the number of parameters that are to be determined; and determining the parameters from the relations.

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 method, apparatus, and computer program product, wherein received signal components are determined for a selected group of sub-carriers based on individual noise and signal contributions of the sub-carriers. At least one of noise and a parameter relating to at least one of noise and a signal of a received signal is estimated by combining the determined received signal components depending on a sign of preamble symbols of the sub-carriers.

Abstract: A method for selecting at least one operating parameter of a communication system (100). The method can include determining a receive signal strength indicator (RSSI) for a communication signal (330). An intermediate value (D) for the communication signal can be determined based on, at least in part, a received value (ri) of at least one known datum, a predetermined value (pi) of the known datum and a channel estimate ({tilde over (h)}i). Further, a carrier to interference and noise ratio (CINR) can be estimated based on, at least in part, the RSSI and the intermediate value. The operating parameter can be selected based on, at least in part, the estimated CINR.

Abstract: A method to control power transmitted from a node in a wireless network. The method includes receiving one or more signals at the node from one or more other nodes of the wireless network, determining a signal-to-interference-plus noise ratio for each signal received from each of the one or more other nodes, transmitting the determined signal-to-interference-plus noise ratio value for each signal received from the one or more other nodes to the respective one or more other nodes, and receiving a signal-to-interference-plus noise ratio value from each of the other nodes in the wireless network. The received signal-to-interference-plus noise ratio value was determined by each of the other nodes. The method further includes determining a minimum signal-to-interference-plus noise ratio for the node, estimating a rate-of-change of the channel gain, and adjusting signals transmitted from the node to the other nodes.

Abstract: Method and apparatus to determine the channel to which a TV tuner is tuned from a return loss ratio measurement circuit in a set top decoder. The method comprises generating a plurality of probe signals having frequencies spread throughput the TV channel band, preferably using harmonics of a zero order hold D/A converter. The return loss ratio of the reflected probe signals is then determined and stored as a signature for the TV channel and the signatures can subsequently be used along with new return loss ratio measurements to determine the TV channel to which a TV or VCR tuner is tuned.

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: The invention relates to a multicarrier mobile device comprising a receiver (101) for receiving a first multicarrier signal being associated with a first communication cell and a second multicarrier signal being associated with a second communication cell, an extractor (103) for extracting a first signal portion from the first multicarrier signal and for extracting a second signal portion from the second multicarrier signal and a processor (105) for determining a first interference power on the first signal portion and the second interference power on the second signal portion.

Abstract: To provide an adjacent channel interference detection apparatus having high detection sensitivity and suitable for LSI integration in a small circuit size. The adjacent channel interference detection apparatus (4) includes: two sign inversion detection units (13a and 13b) that respectively detect sign inversions of an I signal (101) and a Q signal (102); a rotation judgment unit (14) that detects a direction in which a signal point rotates on an IQ plane; a counter unit (15) that counts an output of the rotation judgment unit (14); and an adjacent channel interference detection unit (16) that detects an imbalance in the number of times the signal point rotates in each direction, from the count in the counter unit (15). Adjacent channel interference is detected by an imbalance between the number of times the signal point rotates clockwise and the number of times the signal point rotates counterclockwise on the IQ plane.

Abstract: A method for determining rise over thermal for a base station in a wireless communications system is provided. The method comprises receiving a first and second diversity signal, measuring the signal strength of the first and second diversity signals, and estimating the noise floor for the first and second diversity signals. The signal strength rise is determined for the first and second diversity signals based on the measured signal strength and estimated noise floor of the first and second diversity signals respectively. The rise over thermal is then determined based on the determined signal strength rise of the first and second diversity signals.

Abstract: A factor in deterioration of receiving characteristics of an antenna is automatically determined and automatically improved. In an apparatus for receiving digital broadcast signal, when receiving the signal, a received signal sent from the antenna 1 is orthogonally detected to a baseband signal; an average value of amplitude in radial direction of signal points of phase mapping of the baseband signal is then measured to calculate a C/N value for the received signal; an average value of amplitude in circumferential direction of signal points of the phase mapping of the baseband signal is measured to calculate an amount of phase noise of the received signal; a bit-error rate of transport stream that is given by demodulating the baseband signal is then measured; a factor in deterioration for receiving characteristics of the antenna is determined based on these results; and a desired measure mode is set based on the determination result thereof.

Abstract: A method, computer program product, and system are provided for computing link supportability in a WCDMA communications system. For example, the method can be used to calculate link supportability of a transponder in satellite communications system (e.g. MUOS) in a user-to-base direction. This method can include expressing a carrier signal to noise ratio spectral density for a communication link of interest in terms of a transponder input power of the communication link of interest, a spectral overlap factor representative of one or more interfering communication links, and a transponder input power of the one or more interfering communication links. Assumptions and approximations can be made to simplify the spectral density expression in order to reduce a dimensionality of terms used in the computation of the expression. As such, in reducing dimensionality, the expression becomes a manageable computation for WCDMA communication systems to evaluate.

Abstract: A test method is described for determining radiated radio frequency (RF) receiver sensitivity may include determining a bit error rate (BER) versus traffic channel (TCH) power level function for an initial channel, determining an estimated TCH power level for a subsequent channel based upon the BER versus TCH power level function and a desired BER, and measuring a BER of a subsequent channel based upon the estimated TCH power level. The method may further include comparing the measured BER to the desired BER and using a difference therebetween along with the BER versus TCH power level function to determine a next estimated TCH power level, and repeating measuring and comparing if the difference is greater than a threshold to thereby determine a TCH power level in the subsequent channel corresponding to the desired BER.

Abstract: A test method for determining total isotropic sensitivity (TIS) of a mobile wireless communications device including a radio frequency (RF) receiver and an antenna coupled thereto may include measuring a sensitivity of the RF receiver, and measuring a three-dimensional (3D) gain pattern of the antenna independent of measuring the sensitivity of the RF receiver. The method may further include determining the TIS of the mobile wireless communications device based upon the sensitivity of the RF receiver and the 3D gain pattern of the antenna.

Abstract: An apparatus and method for controlling a digital AGC in a communication system in which power changes significantly from frame to frame. In the digital AGC controlling apparatus, an SNR estimator estimates an uplink SNR of a next frame. A power measurer measures uplink received power of every frame. A gain calculator estimates uplink power of an nth frame using an SNR estimate of an (n?1)th frame received from the SNR estimator and a received power measurement of the (n?1)th frame received from the power measurer, and calculates a gain to be applied to the nth frame in the digital AGC using the uplink power estimate of the nth frame.

Abstract: A wireless station utilizes available metrics to determine whether to request a direct link with another wireless station.

Abstract: A method and apparatus derives an impairment correlation matrix to process signals received at a wireless receiver over multiple paths of a multi-path channel. The receiver includes first and second impairment correlation estimators for estimating first and second impairment correlation matrices based on despread symbols received over multiple paths of a multi-path channel. The receiver then derives the impairment correlation matrix based on the estimated first and second impairment correlation matrices. The receiver may combine traffic despread values to suppress interference using weighting factors calculated based on the derived impairment correlation matrix. Further, the receiver may estimate a signal-to-interference ratio based on the derived impairment correlation matrix.

Abstract: A pilot extract section 14 extracts a pilot signal from received signal. An adder 21 in-phase adds a plurality of correlated values of pilot signals for respective subcarriers. Delay devices 201-1 to 201-6 temporarily maintain one in-phase added value. Multiplier 202-1 to 202-6 multiplies a predetermined coefficient to the in-phase added value that is output from the delay device. The predetermined coefficient reflects the result, which is obtained by correcting for multiple times the difference of channel variation in the different subcarriers that is generated when noise power per one subcarrier is calculated. Each of the multiplying results is added by an adder 24, and is squared by a square device 25. A cumulative adder 26 cumulative-adds the squared values for the whole subcarrier. A multiplier 203 averages by multiplying predetermined values to the cumulative-added values.

Abstract: A test method for determining conducted radio frequency (RF) receiver sensitivity using an RF source coupled to an RF receiver by an RF cable may include determining a bit error rate (BER) versus traffic channel (TCH) power level function for an initial channel, determining an estimated TCH power level for a subsequent channel based upon the function and the desired BER, and measuring a BER of the subsequent channel based upon the estimated TCH power level. The measured BER may be compared to the desired BER, and a difference therebetween is used along with the function to determine a next estimated TCH power level. Measuring and comparing may be repeated if the difference may be greater than a threshold to thereby determine a TCH power level in the subsequent channel corresponding to the desired BER.

Abstract: A link adaptation system using a Doppler frequency is provided. The link adaptation system includes: a Doppler frequency estimation unit to estimate a Doppler frequency of a signal transmitted via a wireless channel; a Signal to Noise Ratio (SNR) measurement interval determination unit to determine an SNR measurement interval of the signal transmitted via the wireless channel based on the estimated Doppler frequency; and an SNR measurement unit to measure an SNR of the signal based on the determined SNR measurement interval.

Abstract: A radio receiver device includes a radio signal processing section and a digital processing section. The radio signal processing section converts a received radio signal into a digital signal, demodulates the digital signal and detects a S/N ratio of the radio signal. The digital processing section digitally processes digital signals and switches over its operation mode based on the detected S/N ratio, thereby controlling a digital noise generated in the digital processing. The radio processing section checks whether the S/N ratio is lowered by a digital noise of the digital processing section or a shielding body external to the radio receiver device. The digital processing section switches over its operation mode to reduce the digital noise only when the cause of the fall of the S/N ratio is caused by the digital noise.

Abstract: The invention relates to access management in a radio communication system. A subscriber unit (101) transmits an access message to a base station (103). A Radio Access Controller (RNC) (109) receives information of the access request. The RNC (109) comprises an interference characteristic processor (111) which determines an interference characteristic associated with the subscriber unit (101). The interference characteristic may include an inter-cell interference factor and an intra-cell orthogonality factor determined as a function of the distance between the base station and the subscriber unit and/or based on subscriber unit measurements of pilot signals from the selected base station (103) and neighbouring base stations (105, 107). The interference characteristic processor (111) is coupled to a resource requirement processor (113) which determines a resource requirement for achieving a desired signal to interference ratio for the requested service in response to the interference characteristic.

Abstract: The method is for detecting the eventual presence of an interferer that is adapted to interfere with a wireless device. The wireless device is provided with at least one receiving chain including an analog to digital conversion stage. The method includes receiving on the receiving chain an incident signal, and delivering to the ADC stage an analog signal from the incident signal. The method further includes elaborating or determining a binary information from a binary signal delivered by the ADC stage and representative of the level of the analog signal, analyzing a temporal evolution of the binary information and detecting the presence of the interferer from the analysis.

Abstract: Various aspects of a method and system from signal quality measurement based on mean phase error magnitude of a signal are presented. Aspects of the system may comprise circuitry that receives a time phase corrected Bluetooth signal via an RF channel. The circuitry may generate a phase error signal based on the received time phase corrected Bluetooth signal, and generate a mean phase error signal based on the generated phase error signal. A signal to noise ratio (SNR) may be derived based on the generated mean phase error signal, and a data rate may be selected based on the derived SNR.

Abstract: The present invention provides a system and method for RF gain control that extracts the background noise information of the received RF signal in the short inter-frame space (SIFS), and computes the background noise information and strength information of the received RF signal to output a feedback control signal to adjust the gain of the RF signal receiver. It optimizes the receiving system and makes the received RF signal be of sufficient strength and have a good quality as well.

Abstract: Provided is a receiver for feeding back channel information, which includes a channel vector measuring unit to measure channel vectors corresponding to a plurality of receiving antennas, respectively, that receive a plurality of data streams, a candidate codebook vector selecting unit to select at least two candidate codebook vectors from codebook vectors included in a codebook, by considering a quantization error based on the channel vectors with respect to each of the data streams, and a selection codebook vector determining unit to determine selection codebook vectors corresponding to the plurality of data streams respectively from the at least two candidate codebook vectors, based on a signal-to-interference and noise ratio (SINR) of each of the data streams that is calculated according to each of the candidate codebook vectors.

Abstract: Base stations transmit strip signals using strip signal segments and self supporting modulation scheme techniques facilitating rapid channel estimate. A strip segment occupies one OFDM symbol time interval and uses a set of downlink tones; some, e.g., half, of the tones are left unused facilitating SIR measurement. The strip segments are advantageously timed to correspond to uplink access intervals in which connected wireless terminals do not typically transmit uplink signals. Connected wireless terminals including: multiple antennas used in combination, an antenna duplex module, single RF receiver chain and single RF transmitter chain, switch antenna coefficient combinations based on strip signal segment timing. The wireless terminal determines an independent downlink channel quality measurement, e.g., SNR and/or SIR for each strip signal segment and for on-going non-strip signaling.

Abstract: A receiving apparatus includes a receiving portion to receive a radio signal generated based on one baseband signal of a baseband signal having a prescribed frequency band and a baseband signal having a partial frequency band being a part of the prescribed frequency band, a signal processing portion to generate the baseband signal by converting a frequency of the radio signal, a filter portion to output a plurality of partial signals, each having a frequency component of each partial frequency band extracted from the baseband signal generated by the signal processing portion, and an analysis portion to analyze characteristics of each partial signal of the plurality of partial signals output from the filter portion.

Abstract: An apparatus and method for antenna selection diversity are provided. Antennas are selected by summing moments of space-time block encoded signals received via each respective antenna and selecting at least one antenna with the largest moment sum.

Abstract: Calibration of received signal strength indication (RSSI) within a radio frequency integrated circuit (RFIC) begins by concurrently enables a transmitter portion and receiver portion. With both the transmitter and receiver enabled, the RFIC provides a zero input to the transmitter portion, where the zero input is an effective zero input based on the input circuitry of the transmitter portion. The RFIC then measures, via the receiver portion, the received signal strength of the RF signal generated by the transmitter portion regarding the zero input signal. The RFIC then compares the measured received signal strength with a desired zero input signal strength value. If the measured received signal strength compares unfavorably with the desired zero input signal strength value (e.g.

Abstract: A transmitting apparatus adds a common pilot symbol and known series for each data slot of a subcarrier group. A receiving apparatus combines SIR calculation values obtained for each subcarrier group, and averages the SIR calculation values. Based on this, it is possible to obtain a high-precision SIR calculation value even when there is a level fluctuation such as shadowing.