Abstract: A channel information feedback method adapted in a receiving end of a multiuser multiple input multiple output (MU MIMO) system has following steps. A subspace matrix and a magnitude matrix related to a transmitting end of the MU MIMO system are obtained according to a channel matrix corresponding to the receiving end. A first quantization is performed on the subspace matrix to generate a quantized subspace matrix. A second quantization is performed on an auxiliary information matrix to generate a quantized auxiliary information matrix, where the auxiliary information matrix is corresponding to the magnitude matrix and a residual subspace matrix, and the residual subspace matrix includes residual subspace information after the first quantization is performed on the subspace matrix. The quantized subspace matrix and the quantized auxiliary information matrix are fed back to the transmitting end through an uplink channel.

Abstract: Methods and systems for loop-through for multi-band TV tuners and set-top box and/or TV set applications are disclosed and may include generating master and slave output signals from one or more low-noise amplifiers including master and slave stages. The master and slave stages may include parallel-coupled gain paths. Gate terminals and source terminals of input transistors for the master and slave stages may be directly coupled. The input transistors for the master and slave stages may share an inductor coupled to the source terminals and to ground. The master and slave stages may include cascode stages. VHF and UHF signals may be amplified in the multi-band receiver. The generated master output signal may be processed in the multi-band receiver, and may be utilized to generate I and Q output signals. A plurality of the slave output signals may be summed and communicated to a receiver external to the multi-band receiver.

Abstract: In an embodiment, a radio communication device may be provided. The radio communication device may include a first receiver configured to receive from a first cell first data representing a content encoded using a first codec; a second receiver configured to receive from a second cell second data representing the content encoded using a second codec; and a combiner configured to combine the first data and the second data.

Abstract: This invention relates to a Multi-Input Multi-Output Orthogonal Frequency Divisional Multiplexing (MIMO-OFDM) is a transmission technology for many current and next generation wireless communication systems. Carrier Frequency Offset (CFO) Estimation and Correction is one of the most important requirement of the proper reception of MIMO-OFDM Signals. The invention provides a null subcarrier based scheme to accomplish this task. The CFO is estimated by employing the covariance matrix of the signals on all receiving antennas with a cost function which minimizes the energy falling on the null subcarrier locations due to frequency offset. The proposed approach results in very low computational complexity as it uses a two step procedure, making it very attractive for real time applications. Also a new null subcarrier allocation scheme based on Fibonacci series is proposed which ensures a frequency offset estimation range equal to the maximum possible range equal to the OFDM bandwidth.

Abstract: A signal processing circuit is disclosed, comprising a first node for coupling with a first antenna, a second node for coupling with a second antenna, a third node for receiving a first signal from a transmitting circuit, a fourth node for coupling with a receiving circuit, a signal dividing circuit, a phase shifting circuit, and a signal combining circuit. The signal dividing circuit divides the first signal into a second signal and a third signal, and transmits the second signal to the first antenna. The phase shifting circuit shifts the phase of the third signal to generate a fourth signal for canceling at least part of a coupled signal between the third node and the fourth node. The signal combining circuit combines the fourth signal and a fifth signal received from the second antenna, and transmits the combined signal to the receiving circuit.

Abstract: Systems are disclosed that utilize AC-coupled filtering to reduce DC offset, with aspects dynamically correcting instantaneous DC offset generated from the AC-coupled filtering. A DC offset correction circuit for an radio frequency (rf) receiver, comprising a switchable high pass filter configured to receive a signal, the switchable high pass filter including a plurality of high pass filters connected in parallel, wherein at least one of the plurality of high pass filters has a tunable corner frequency.

Abstract: Methods and apparatus are provided for performing equalization of communication channels. In an embodiment of the invention, at least one tap can be selected from a set of feedforward taps of feedforward filter circuitry, where each tap of the selected at least one tap has a magnitude that is greater than or substantially equal to a magnitude of any tap of the set of feedforward taps that is not in the selected at least one tap. In addition, at least one tap can be added to a set of taps of feedback filter circuitry in communication with the feedforward filter circuitry. The invention advantageously allows for more efficient and reliable equalization of communication channels.

Abstract: A method and apparatus of selecting which of a plurality of receiver chains of a mobile unit to receive wireless signals, is disclosed. One method includes measuring a first receive signal quality while all of the plurality of receiver chains are receiving wireless signals, and measuring a second receive signal quality while a subset of the plurality of receiver chains are receiving wireless signals. The subset of the plurality of receiver chains are selected to receive wireless signal unless the first receive signal quality is a threshold better than the second receive signal quality. If the first receive signal quality is a threshold better than the second receive signal quality then all the plurality of receiver chains are selected to receive wireless signals.

Abstract: A wireless device includes processing circuitry and a Radio Frequency (RF) receiver section. The processing circuitry determines a set of information signals for receipt, the set of information signals carried by a RF Multiple Frequency Bands Multiple Standards (MFBMS) signal having a plurality of information signal frequency bands. The processing circuitry determines a shift frequency based upon the determination. the RF receiver section receives the RF MFBMS signal and down-converts the RF MFBMS signal by the shift frequency to produce a baseband/low Intermediate Frequency (BB/IF) MFBMS signal. The processing circuitry then extracts data from the set of information signals of the BB/IF MFBMS signal.

Abstract: A wireless networking receiver with digital antenna switching selects an antenna with an 802.11b signal based on a signal metric, such as the highest signal quality or highest peak amplitude. In one embodiment, the receiver comprises a plurality of antennas that may each receive one of a plurality of RF signals conforming to the IEEE 802.11b standard. The receiver may have multiple antennas for use with the IEEE 802.11n standard, but may receive signals conforming to the 802.11b standard. The receiver also comprises a carrier sense circuit configured to calculate a signal metric for each of the signals and further configured to generate a selection signal signifying one of the signals, based on the signal metric. The receiver further comprises a multiplexer configured to output one of the signals, based on the selection signal.

Abstract: A receiver includes an antenna array that generates received signals from a first remote transmitter and a second remote transmitter, the antenna array having a beam pattern that is controllable based a control signal. A plurality of receiver sections process the received signals to generate down-converted signals. A receiver processing module, generates the control signal to control the beam pattern to a first pattern during a first time period for reception from the first remote transmitter, generates a first reception estimate based on the down-converted signals during the first time period, generates the control signal to control the beam pattern to a second pattern during a second time period for reception from the second remote transmitter, generates a second reception estimate based on the down-converted signals during the second time period, and generates inbound data based on the first reception estimate and the second reception estimate.

Abstract: Methods, systems and apparatuses are provided for transmitting and receiving space-time block coded data in a wireless communications system with co-operative relays. A source node transmits RF signals representing first and second sets of data symbols in respective first and second channels (in time frequency code or any combination) of a wireless communications system, the first and second sets of data symbols being for transmission from separate antennas respectively according to a space-time block code. A relay node receives the RF signals representing the first set of data symbols in the first channel and transmits RF signals representing the first set of data symbols in the second channel. A destination node received the RF signals representing the second set of data symbols from the source node and the RF signals representing the first set of data symbols from the relay node.

Abstract: A diversity receiver includes a first RF front end module for receiving a first RF signal, and frequency converting the first RF signal and outputting a first diversity signal, a second RF front end module for receiving a second RF signal, frequency converting the second RF signal and outputting a second diversity signal, a first converter for converting the first diversity signal to a first time-domain signal, a second converter for converting the second diversity signal to a second time-domain signal, a first transformer for translating the first time-domain signal to a first frequency-domain signal, a second transformer for translating the second time-domain signal to a second frequency-domain signal, a first pre-equalizer for equalizing the first frequency-domain signal, a second pre-equalizer for equalizing the second frequency-domain signal, and a combiner for combining the first and second pre-equalized frequency-domain signals.

Abstract: Seamless wideband support is afforded by utilizing split-band data streams. For wideband signals, the 8 kHz bandwidth is divided into a low band, with approximately 0-4 kHz bandwidth, and a high band, with approximately 4-8 kHz bandwidth. Narrowband functions and services operate on the low band, while wideband functions and services operate on both low and high bands.

Abstract: An RF (radio frequency) combiner utilizes RF filtering cavities and transmission paths incorporated into an RF impervious material. This allows traditional stand-alone multiplexers to be integrated into a single device without using signal loss-inducing cables and connections between the multiplexers. The simplicity of the RF combiner allows for RF filters to be milled out of the same RF impervious material without requiring an external RF connection and avoids a cascading of multiple RF filters. In one instance, the RF combiner is employed with two BTS (base transceiver stations) to allow the sharing of antennas without the power losses associated with traditional cascading duplexers.

Abstract: A method for transmitting symbols in a communication system, includes dividing N symbols to be transmitted at one time into 2 groups. A first processing is performed on each of a plurality of symbols in a first group in order to obtain a first group of superimposed symbols. A second processing is performed on each of a plurality of symbols in a second group to obtain a second group of superimposed symbols. Each of the first group of superimposed symbols is transmitted one by one by a first antenna, and corresponding symbols in the second group of superimposed symbols are transmitted by a second antenna. The first processing and the second processing respectively include a conjugate cancellation operation.

Abstract: Circuits, architectures, a system and methods for providing on-chip gain calibration. The circuit generally includes a receiver comprising (i) a resistor on a semiconductor substrate, the resistor configured to provide a signal having a noise component that varies with temperature, and (ii) an amplifier circuit on the semiconductor substrate coupled to the resistor, the amplifier circuit configured to receive the signal and provide a second signal having an amplitude greater than the first signal. The architectures and/or systems generally include those that embody one or more of the inventive concepts disclosed herein. The method generally includes (i) providing a noise signal from a resistor to an amplifier, the resistor being on a common semiconductor substrate with the amplifier, (ii) determining a resistance value of the resistor, (iii) determining an impedance at an input of the amplifier, and (iv) determining a gain of the amplifier.

Abstract: A method and system for beamforming communication in high throughput wireless communications. Analog beamforming involves constructing analog beamforming coefficients for beamforming communication on a wireless channel. Constructing analog beamforming coefficients includes selecting a signal tap from a multi-tap wireless channel for beamforming communication, wherein the selected signal tap has a higher signal quality relative to other signals taps, and determining beamforming coefficients for the selected tap by iterative acquisition of the coefficients based on power iteration.

Abstract: A mobile device that includes an antenna, an interface, and an application. The antenna is capable of receiving a signal. The interface is capable of receiving a second signal in synchronization with the signal and the application is configured to perform receive diversity processing using the signal and the second signal. Further, is included a mobile device that includes the antenna, the interface, and a second application where the second application is configured to perform multiple input multiple output (MIMO) processing using the signal and the second signal. Increased bandwidth and processing gain is achieved for the received signal by the receive diversity processing and the MIMO processing.

Abstract: A MIMO transmitter and method for transmitting a group of sequential OFDM symbols on a downlink channel using a plurality of antennas is disclosed herein. Groups of OFDM subcarriers are individually modulated in accordance with spatial-frequency subcarrier modulation assignments to generate groups of symbol-modulated subcarriers, corresponding symbol-modulated subcarriers are combined for transmission on each of a plurality of spatial channels, and beamforming is performed on the combined symbol-modulated subcarriers for transmission over the spatial channels. The channel comprises a plurality of the groups of the OFDM subcarriers and the OFDM subcarriers within each group of subcarriers and within each group of sequential OFDM symbols have the same spatial-frequency subcarrier modulation assignments. The spatial-frequency subcarrier modulation assignments for each group are determined based on feedback by a receiver, which is determined from spatial channel characteristics of the spatial channels.

Abstract: A method, apparatus and computer program product are provided to facilitate the determination of the environmental context of a mobile terminal. In this regard, the method, apparatus and computer program product may utilize the features obtained by a plurality of different types of radio receivers in order to more precisely determine the environmental context of the mobile terminal. The performance of the mobile terminal including applications executed by the mobile terminal may correspondingly be more accurately tailored to the current environmental context of the mobile terminal.

Abstract: A radio communication method includes generating a first transmit RF signal and a second transmit RF signal from a data signal to be transmitted. Each of the first and second transmit RF signals have a power spectrum in symmetric shape in the frequency domain. The first transmit RF signal and the second transmit RF signal are transmitted at a different time. The first transmit RF signal and the second transmit RF signal are received to generate a first received RF signal and a second received RF signal. The data signal from the first received RF signal and the second received RF signal are reproduced.

Abstract: An antenna system for receiving an RF signal from a first antenna and a second antenna includes a phase shift circuit. The phase shift circuit shifts a phase of the RF signal from the second antenna by one of a plurality of possible phase shifts to produce a phase shifted signal. A combiner combines the RF signal from the first antenna and the phase shifted signal to produce a combined signal. A comparator circuit compares a signal quality of the combined signal with a minimum threshold value to determine if the signal quality of the combined signal is equal to or greater than the threshold value. The comparator circuit is in communicative control of the phase shift circuit and maintains the phase shift of the RF signal received by the second antenna in response to the signal quality of the combined signal being equal to or greater than the threshold value.

Abstract: According to an embodiment, a DC offset canceller includes a first DA converter, a first adder, an amplifier, a comparator, an averaging circuit, and a successive approximation register. The first DA converter is configured to DA-convert first correction data into a first correction voltage. The first adder is configured to add an input signal and the first correction voltage to output a first added signal. The amplifier is configured to amplify the first added signal to output an amplified signal. The comparator is configured to compare the amplified signal and a reference voltage to output a comparison result. The averaging circuit is configured to receive the comparison results of the comparator to obtain a majority decision result by performing majority decision on logical values of the comparison results in a predetermined time period.

Abstract: An encoded signal is modulated to produce a first radio frequency (RF) signal that is transmitted to a client module over a first transceiver channel when a first transceiver module is in a transceive mode. A channel scan is performed when the first transceiver module is in a scan mode. The encoded signal is modulated to produce a second RF signal and that is transmitted over a second transceiver channel when a second transceiver module is in a transceive mode.

Abstract: An improved OFDM receiver is realized by employing a simplified delay function for the transmissions channel. The simplified delay function yields a simplified frequency-domain correlation that is applied to develop an Eigen matrix U that is used in developing estimates of the channels. Those channel estimates are used in the receiver to develop the output signals.

Abstract: Methods and systems for loop-through for multi-band TV tuners and set-top box and/or TV set applications are disclosed and may include generating master and slave output signals from one or more low-noise amplifiers including master and slave stages. The master and slave stages may include parallel-coupled gain paths. Gate terminals and source terminals of input transistors for the master and slave stages may be directly coupled. The input transistors for the master and slave stages may share an inductor coupled to the source terminals and to ground. The master and slave stages may include cascode stages. VHF and UHF signals may be amplified in the multi-band receiver. The generated master output signal may be processed in the multi-band receiver, and may be utilized to generate I and Q output signals. A plurality of the slave output signals may be summed and communicated to a receiver external to the multi-band receiver.

Abstract: A method and mobile communication station for communicating orthogonal frequency division multiplexed (OFDM) symbols uses two or more antennas. The antenna parameters are set for beamforming, a transmit power level is initially set, and subcarrier modulation assignments are selected after the antenna parameters and the transmit power level are set to achieve a quality-of-service level for a particular application and data type of a service flow. The transmit power level may also be set based on a desired cell size.

Abstract: Detection device for detection and generation of detection device generated signal, processed with remote control device generated remote control signal, with location finder or location tracker or navigation signal and with Modulation Demodulation (Modem) Format Selectable (MFS) communication signal. Processor for processing a digital signal into cross-correlated in-phase and quadrature-phase filtered signal and for processing a voice signal into Orthogonal Frequency Division Multiplexed (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA) signal. Detection device generated signal and location finder signal, with OFDM or OFDMA processed voice signal is used in a Wireless Local Area Network (WLAN) and in Voice over Internet Protocol (VoIP) network. Detection device generated signal and location finder signal with Time Division Multiple Access (TDMA), Global Mobile System (GSM) and spread spectrum Code Division Multiple Access (CDMA) signal is used in a cellular network.

Abstract: Complex digital data values derived from a DSSS signal, in particular, a GNSS signal, are delivered to a general purpose microprocessor at a rate of 8 MHz and chip sums over eight consecutive data values spaced by a sampling length (TS), each beginning with one of the data values as an initial value, formed and stored. For code removal, each of a series of chip sums covering a correlation interval of 1 ms and each essentially coinciding with a chip interval of fixed chip length (TC), where a value of a basic function (bm) reflecting a PRN basic sequence of a satellite assumes a correlation value (Bm), is multiplied by the latter and the products added up over a partial correlation interval to form a partial correlation sum. The partial correlation interval is chosen in such a way that it essentially coincides with a corresponding Doppler interval having a Doppler length (TD) where a frequency function used for tentative Doppler shift compensation and represented by a step function (sine, cosine) is constant.

Abstract: In accordance with various aspects of the disclosure, a method and apparatus for receiving multiple channels from a broadcast source and interfacing to multiple demodulators within a common silicon implementation is disclosed. A receiver apparatus is disclosed that may aggregate multiple channels output by multiple tuners into at least one composite signal. The at least one composite signal may be passed to a single ADC. The channels may then be extracted from the at least one composite signal in the digital domain prior to demodulation in separate demodulators.

Abstract: Techniques for enhanced co-existence for co-located radios are described. A mobile computing device may comprise a first radio module operative to communicate wirelessly across a first link using a first set of communications channels, a second radio module operative to communicate wirelessly across a second link using a second set of communications channels, and a coordination module operative to receive information regarding operation of the first and second radio modules, and modify a communications parameter for the first or second radio module based on the received information. Other embodiments are disclosed and claimed.

Abstract: A transceiver arrangement includes a first receive path with a first connection and a first receive amplifier, and a second receive path with a second connection, a second receive amplifier, and a frequency conversion device. A controllable coupling device is configured to couple an output of the first receive amplifier to an input of the frequency conversion device on the second signal path. Furthermore, the transceiver arrangement includes a control circuit configured to deliver a control signal to the coupling device for combining signals delivered by the first and second receive amplifier in the correct phase based on a signal supplied by the receive paths. This achieves receive diversity wherein, on the one hand, additional external components are no longer necessary and, on the other hand, adequate signal quality is ensured even with a simultaneous transmit process of the transceiver arrangement.

Abstract: Certain aspects of the method may comprise generating at least one control signal that may be utilized to control at least a first of a plurality of received spatially multiplexed communication signals. An amplitude and/or phase of the first received spatially multiplexed communication signal may be adjusted via the generated control signal so that the amplitude and/or phase of the first received spatially multiplexed communication signal may be equivalent to an amplitude and/or phase of a second received spatially multiplexed communication signal. The amplitude of the first received spatially multiplexed communication signal is adjusted within the processing path used to process the first received spatially multiplexed communication signal.

Abstract: A radio receiver includes a first receiver module for converting a first radio frequency (RF) signal at a first carrier frequency into a first baseband signal. A second receiver module converts a second RF signal at a second carrier frequency into a second baseband signal. A recombination module combines the first baseband signal and the second baseband signal into an output signal.

Abstract: A receiver includes an antenna array that generates a plurality of received signals from at least a first remote transmitter and a second remote transmitter, the antenna array having a beam pattern that is controllable based on at least one control signal. A plurality of receiver sections process the plurality of received signals to generate a plurality of down-converted signals.

Abstract: A diversity receiver includes: a plurality of demodulating means for demodulating inputted OFDM signals, to output their demodulated signals; noise component calculating means provided for each demodulating means, for calculating noise components included in the demodulated signals outputted from corresponding demodulating means; channel profile calculating means provided for each demodulating means, for calculating channel profiles based upon the demodulated signals outputted from corresponding demodulating means; transmission channel decision means for determining transmission channel based upon the channel profiles; reliability information generating means for generating reliability information indicating reliability of the demodulated signals outputted from each demodulating means, based upon the noise components and the results of the determinations by the transmission channel decision means; a weighting factor calculating means for calculating, depending on the reliability information, weighting factors

Abstract: A wireless networking receiver with digital antenna switching selects an antenna with an 802.11b signal based on a signal metric, such as the highest signal quality or highest peak amplitude. In one embodiment, the receiver comprises a plurality of antennas that may each receive one of a plurality of RF signals conforming to the IEEE 802.11b standard. The receiver may have multiple antennas for use with the IEEE 802.11n standard, but may receive signals conforming to the 802.11b standard. The receiver also comprises a carrier sense circuit configured to calculate a signal metric for each of the signals and further configured to generate a selection signal signifying one of the signals, based on the signal metric. The receiver further comprises a multiplexer configured to output one of the signals, based on the selection signal.

Abstract: A receiver including: a delay profile generating unit to generate a delay profile from a received signal; combining unit operable to combine multiple received signals with different timings; a determining unit to determine whether or not the propagation environment of the received signals is multi-path, based on the delay profile; and a control unit operable to exclude any signal with timing whose power is equal to or lower than a predetermined threshold in the delay profile from the combining, upon the determination not being multi-path.

Abstract: Methods and systems that utilize AC-coupled filtering to reduce DC offset, with aspects dynamically correcting instantaneous DC offset generated from the AC-coupled filtering. A DC offset correction circuit for an radio frequency (rf) receiver comprises a switchable high pass filter receiving a downconverted rf signal. The switchable high pass filter has N selectable corner frequencies, where N is greater than two.

Abstract: A wireless device includes processing circuitry and a Radio Frequency (RF) receiver section. The processing circuitry determines a set of information signals for receipt, the set of information signals carried by a RF Multiple Frequency Bands Multiple Standards (MFBMS) signal having a plurality of information signal frequency bands. The processing circuitry determines a shift frequency based upon the determination. the RF receiver section receives the RF MFBMS signal and down-converts the RF MFBMS signal by the shift frequency to produce a baseband/low Intermediate Frequency (BB/IF) MFBMS signal. The processing circuitry then extracts data from the set of information signals of the BB/IF MFBMS signal.

Abstract: Methods and apparatus are provided for performing equalization of communication channels. In an embodiment of the invention, at least one tap can be selected from a set of feedforward taps of feedforward filter circuitry, where each tap of the selected at least one tap has a magnitude that is greater than or substantially equal to a magnitude of any tap of the set of feedforward taps that is not in the selected at least one tap. In addition, at least one tap can be added to a set of taps of feedback filter circuitry in communication with the feedforward filter circuitry. The invention advantageously allows for more efficient and reliable equalization of communication channels.

Abstract: The present invention provides a plurality of embodiments for beamforming in an asymmetrical system wireless communication system (400) of NT (102i) transmit antennae and NR (104j) receive antennae where NT>NR that ensure the transmit power on each antenna is the same, without appreciable loss in performance. Additionally, a technique is provided for choosing fewer beamforming vectors than frequency bins in an OFDM system.

Abstract: It is an object of the present invention to provide a radio signal demodulating device in which fluctuation follow ability of transmission channel environment is improved. The radio signal demodulating device according to the present invention receives the amplitude of an information signal in which known pilot signals are multiplexed, as a radio signal modulated in proportion to the time change of frequency of a carrier wave The radio signal demodulating device according to the present invention includes a frequency converting unit, a signal combining unit, a first pilot signal extracting unit, a second pilot signal extracting unit, a first pilot orthogonal signal generating unit, a second pilot orthogonal signal generating unit, a first error signal generating unit, a first weight factor updating unit for calculating a weight factor to be used in the signal combining unit, by using a first pilot orthogonal signal and a first error signal obtained by the first error signal generating unit.

Abstract: Methods and systems lor temporally aligning audio samples of digital and analog portions ol a radio broadcast signal involve receiving a radio broadcast signal having analog and digital portions; separating the analog and digital portions; retrieving a stored first time interval of an approximate time for a sample of the digital portion to travel through a digital signal path in a receiver including a digital demodulator: measuring a second time lor the sample of the digital portion to travel from an input of the digital signal path to an input of the digital demodulator; generating a delay amount by adding the first time to the second time; delaying second audio samples of the digital portion by tho delay amount relative to first audio samples of tho analog portion such that the second audio samples are temporally aligned with the first audio samples; and combining ihe first and second audio samples.

Abstract: In one embodiment, the present invention provide a method for detecting signal quality metrics of a constant modulo (CM) signal received in two different signal paths, and combining the signal from the two signal paths based at least in part on the detected first and second signal quality metrics. Such method may be implemented in a radio receiver such as an automobile receiver.

Abstract: A device and method for performing a channel profile estimation for an OFDM-based wireless communication system uses an averaged frequency coherence metric to select a particular channel profile, which is a current channel profile estimate. The averaged frequency coherence metric is derived using correlations between pilot subcarriers of an OFDM-based signal at predefined subcarrier locations for multiple frames of the OFDM-based signal. The selected channel profile may be used for channel estimation, as well as for link adaptation, to improve the performance of these processes.

Abstract: A device and method for performing a channel estimation for an OFDM-based wireless communication system using sparsely spaced pilot subcarriers estimates missing pilot subcarriers in an interpolation window using pilot subcarriers that are outside of the interpolation window to produce estimated pilot subcarriers for the interpolation window. The pilot subcarriers in the interpolation window and the estimated pilot subcarrier are used to compute pilot channel estimates for the interpolation window, which are then used to derive data channel estimates for the interpolation window.

Abstract: In an RF communication system, aspects for diversity processing may comprise processing a plurality of received multipath signals as clusters of signals. The received multipath signals may be diversity signals received from diversity transmit antennas at a base station. Timing information may be generated for tracking the clusters of signals. Complex phase and amplitude information may also be estimated for at least some of the multipath signals in the clusters of signals. At least a portion of the received multipath signals may be combined to form a single path processed diversity signal. A plurality of the single path processed diversity signals may be combined together, where each of the single path processed diversity signals may be derived from one of the plurality of diversity transmit antennas at the base station. The diversity signals may be transmitted via at least one of a plurality of diversity modes.

Abstract: An uplink channel sounding apparatus and method in a wireless communication system are provided, in which in an MS, a baseband MODEM generates as many channel sounding signals as the MS has antennas and outputs the channel sounding signals to an antenna switch. The antenna switch switches the channel sounding signals to the antennas in a one-to-one basis transmitting the channel sounding signals to a BS through all of the antennas of the MS.