Abstract: An embodiment of the present invention includes a transceiver for use in a multi-input-multi-output (MIMO) Orthogonal Frequency Domain Multiplexing (OFDM) wireless communication system. The transceiver decodes and remodulates certain signal fields and uses the same to update the coefficients of a frequency equalizer thereby improving channel estimation and extending training.

Abstract: A modem system for transmitting and receiving signals having a frequency domain equalizer (FEQ) being responsive to a plurality of received data symbols for processing the same to generate one or more equalized data symbols, said modem system being responsive to a plurality of received baseband signals for processing the same to generate said plurality of received data symbols, said plurality of received data symbols for including one or more sets of pilot tones, said FEQ for processing said sets of pilot tones to generate one or more sets of equalized sets of pilot tones, in accordance with an embodiment of the present invention.

Abstract: An embodiment of the present invention includes a calibration system employed in a multi-input-multi-output (MIMO) system for beamforming and receiving a plurality of streams. The system includes a first calibration circuit responsive to inphase (I) and quadrature (Q) pairs of stream and operative to calibrate each I and Q pair and a second calibration circuit responsive to the calibrated I and Q pairs for all streams, wherein the first and second calibration circuits perform calibration in the time domain.

Abstract: A multi input multi output (MIMO) transceiver having a channel estimation module being responsive to received samples including channel state information (CSI) and operative to generate time domain beamforming parameters, in accordance with an embodiment of the present invention.

Abstract: An embodiment of the present invention includes a calibration system employed in a multi-input-multi-output (MIMO) system for beamforming and receiving a plurality of streams. The system includes a first calibration circuit responsive to inphase (I) and quadrature (Q) pairs of stream and operative to calibrate each I and Q pair and a second calibration circuit responsive to the calibrated I and Q pairs for all streams, wherein the first and second calibration circuits perform calibration in the time domain.

Abstract: A multi input multi output (MIMO) receiver for receiving signals having a synchronization (SYNC) module being responsive to a plurality of received baseband signals for processing the same to generate maximum ratio combining (MRC) parameters, complementary code keying (CCK) modulated signals and orthogonal frequency division multiplexing (OFDM) modulated signals, said SYNC module for using said MRC parameters to process said OFDM modulated signals to generate a plurality of aligned OFDM signals in time domain, said MIMO receiver for processing said plurality of aligned OFDM signals to generate a plurality of subcarriers, in accordance with an embodiment of the present invention. The MIMO receiver further including a time domain CCK MRC module being responsive to said MRC parameters for processing said CCK modulated signals in time domain to generate aligned signals, said aligned signals being combined to generate an adjusted signal for demodulation.

Abstract: A wireless communication system for transmitting signals having a wireless positioning system being responsive to incoming signals for processing the same to generate coordinate information for determining the position of said wireless communication system, in accordance with an embodiment of the present invention. The wireless communication system further includes a phase controller module being responsive to said coordinate information for controlling the phase of the output signals for transmission in a specified direction by performing beamforming, said wireless communication system for performing beamforming to increase the range of transmission of said output signals.

Abstract: A multiple receiving antennae system having a plurality of radio frequency (RF) modules being responsive to incoming signals for processing the same to generate baseband signals. The multiple receiving antennae system further processes baseband signals to generate digital baseband signals, in accordance with an embodiment of the present invention. The multiple receiving antennae system further still includes a plurality of automatic gain control (AGC) modules being responsive to digital baseband signals for processing the same to generate a plurality of gain values. The plurality of gain values are used in the plurality of RF modules for independent gain adjustment of the incoming signals. The plurality of gain values are used to generate adjusted signals with enhanced signal to noise ratio (SNR) to improve the performance of the multiple receiving antennae system, whereby the plurality of gain values are used to enhance reception of incoming signals by improving SNR.

Abstract: A modem system for receiving and transmitting signals having a frequency domain equalizer (FEQ) block being responsive to a frequency channel response for processing the same to generate one or more initial FEQ coefficients (FEQ1), the modem system is responsive to an input signal for processing the same to generate frequency channel response, the input signal being generated from a transmitted signal, FEQ block using FEQ1 to generate an equalized Signal, modem system demodulating equalized Signal to generate a demodulated Signal symbol, in accordance with an embodiment of the present invention.

Abstract: One embodiment of the present invention includes a frequency generation circuit including a control module, an oscillator circuit coupled to the control module, the oscillator circuit having a start-up time defined by the time required to reach a desired frequency. The oscillator circuit includes an amplifier having an input and an output and being programmably-alterable by the control module, a first capacitor coupled to the input of the amplifier and being programmably-alterable, in capacitance, by the control module, a second capacitor coupled to the output of the amplifier, a crystal resonator coupled to the first and second capacitors for generating an output signal having a desired frequency, wherein fast start-up time is achieved.

Abstract: A modem system for receiving and transmitting signals having a frequency domain equalizer (FEQ) block being responsive to a frequency channel response for processing the same to generate one or more equalizer coefficients, the modem system is responsive to an input signal for processing the same to generate frequency channel response, the input signal being generated from transmission of a transmitted signal, FEQ block for using equalizer coefficients to generate an equalized channel response, modem system for using equalized channel response to generate one or more metric weights, in accordance with an embodiment of the present invention.

Abstract: A receiver system that receives signals and has a demapper device that is responsive to an equalizer output and generates a demapper output including one or more bit metrics. The receiver system also generates equalizer output, and the demapper uses distance measure to calculate bit metrics. The receiver system uses demapper output to generate a processed output. The receiver system further includes a convolutional decoder which is responsive to the processed output, and subsequently generates a decoded bit sequence, as well as uses the processed output to generate one or more path metrics. The convolutional decoder uses bit metrics and path metrics to the decode processed output, to generate a decoded bit sequence. The receiver system uses the distance measure to reduce the size of the bit metrics and the size of the path metrics to improve the performance of said convolutional decoder.

Abstract: A maximum likelihood sequence estimator (MLSE) equalizer device being included in an MLSE sub-receiver includes a feedforward circuit responsive to input data for processing the same to generate feedforward circuit output, said input data being generated from transmitted data being transmitted by wireless transmission, in accordance with an embodiment of the present invention. The MLSE equalizer device further includes a feedback circuit responsive to said input data for processing the same to generate feedback circuit output.

Abstract: A coding/decoding trellis structure circuit included in a maximum likelihood sequence estimator (MLSE) sub-receiver having one or more distance calculation units (distus) responsive to equalized data generated by said MLSE sub-receiver from wireless transmission of transmitted data, said distu further responsive to MLSE codewords for processing the same, said equalized data including one or more equalized data chips and each of said MLSE codewords including one or more MLSE codeword chips, each of said distus for processing an equalized data chip and an MLSE codeword chip to generate a chip output, said distu for using said chip output to generate distance measures, a distance measure being the distance between said equalized data and said MLSE codeword, in accordance with an embodiment of the present invention.

Abstract: A modem receiver for receiving signals having a frequency domain equalizer training module (FTM) being responsive to a frequency channel response for processing the same to generate one or more frequency domain equalizer (FEQ) coefficients, said modem receiver being responsive to an input signal for processing the same to generate said frequency channel response, said input signal being generated from transmission of a transmitted signal, said frequency channel response for including one or more pilot tones, said FEQ coefficients for including one or more pilot tone FEQ coefficients, in accordance with an embodiment of the present invention.

Abstract: A maximum likelihood sequence estimator (MLSE) sub-receiver is disclosed, in one embodiment of the present invention and includes an MLSE equalizer device responsive to input data to generate equalized data. The input data is generated from transmitted data by wireless transmission. The MLSE equalizer device processes the input data to generate residual channel response using a known codebook and the residual channel response to generate an MLSE codebook. The MLSE sub-receiver further includes an MLSE decoder responsive to the equalized data and the MLSE codebook for processing to determine maximum likelihood between the equalized data and the MLSE codebook. The MLSE decoder uses the maximum likelihood for decoding the equalized data to generate a decoded transmitted data by mitigating the effects of multi-path communication channel due to wireless transmission of the transmitted data.

Abstract: A phase control loop circuit for tuning to a reference frequency signal having a phase lock loop (PLL) circuit being responsive to a reference frequency signal having a reference frequency, said PLL circuit including a voltage control oscillator (VCO) for generating a VCO output, said PLL circuit for generating a PLL output, said phase control loop circuit processing said VCO output to generate an output frequency signal having an output frequency, in accordance with an embodiment of the present invention.

Abstract: A gain stage is disclosed. The gain stage comprises a first stage that provides two voltages of equal and opposites polarities and a plurality of devices cross coupled to the first stage. The plurality of devices minimize the Miller Effect capacitance in the differential stage by providing an out-of-phase signal to the first stage. Accordingly, a system and method in accordance with the present invention utilizes an at least one extra device on the same die as the first stage to provide an impedance match. In so doing, a broadband cancellation of the Miller Effect is achieved. Moreover, the matching is valid over an extended temperature range.

Abstract: A mixer is disclosed. The mixer comprises a high isolation gain stage and an impedance transformation network coupled to the gain stage. The mixer includes a plurality of switching devices coupled to the network and a phase shifter coupled to the plurality of switching devices. The mixer is utilized as a receiver and a low noise amplifier is not needed. A receiver in accordance with the present invention achieves high gain and low noise in the mixer and therefore eliminates the need for a separate LNA. In so doing, an isolation gain stage achieves high gain, and image noise is rejected before entering the mixer stage.