Patent ID: 7545891
Filing Date: 2009-06-09
Classification: H04L

Abstract:
1. A modem system for transmitting and receiving signals comprising: 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 pilot tones; a frequency offset detection module being responsive to said sets of equalized pilot tones to generate one or more instantaneous carrier offsets, said modem system for processing said instantaneous carrier offsets to generate one or more frequency corrections for applying the same to said plurality of received baseband signals to remove carrier offsets therefrom; a receiver circuit being responsive to a plurality of received signals for processing the same to generate said plurality of received baseband signals, said receiver circuit for including a plurality of antennae for receiving said plurality of received signals, said receiver circuit for decoupling said plurality of received data symbols; a transmitter and a physical channel, said transmitter for sending signals to said physical channel for processing the same to generate a plurality of data symbols, said plurality of data symbols being transmitted to said receiver circuit; a plurality of radio frequency (RF) modules being responsive to said plurality of received signals for processing the same to generate said plurality of received baseband signals, said modem system further including a phase lock loop (PLL) circuit for generating a common reference RF source for de-mixing said plurality of received signals; a plurality of frequency shifters being responsive to said plurality of received baseband signals for processing the same to generate one or more adjusted signals, said plurality of frequency shifters for applying said frequency corrections to said plurality of received baseband signals to generate said adjusted signals; one or more fast Fourier transform (FFT) analyzers being responsive to said adjusted signals for processing the same to generate said plurality of said received data symbols for including 64 frequency domain subcarriers; and being a one-input two-output (1T2R) modem system wherein said transmitter for sending one set of signals to said physical channel, said set of signals for including said set of pilot tones having an i wherein said plurality of received signals for including an i wherein said FEQ for utilizing estimated channel coefficients to generate said equalized data symbols, said estimated channel coefficients being expressed as wherein said sets of equalized pilot tones for including an i  and wherein the flexible architecture of said modem system allows for removal of said carrier offsets to improve reception of said plurality of received baseband signals.