Patent ID: 7738538
Filing Date: 2010-06-15
Classification: H04L

Abstract:
1. A receiver system for receiving packets of information in a multi input multi output (MIMO) communications system comprising: a synchronization module responsive to a first received baseband signal, including subcarriers, from a first antenna and a second baseband signal, including subcarriers, from a second antenna, each of said first and second received baseband signals including a respective orthogonal frequency division multiplexing (OFDM) modulated signal and a respective time domain complementary code keying (CCK) modulated signal, the synchronization module operative to align the OFDM modulated signals in the time domain and to generate two aligned OFDM signals, the synchronization module further operative to compute maximum ratio combining (MRC) parameters for the time domain CCK modulated signals included in the received baseband signals; time domain CCK MRC module responsive to the MRC parameters and operative to apply the time offset and the phase offset to the CCK modulated signals in time domain to generate aligned signals, the aligned signals being combined to generate an adjusted signal transferred to the CCK module for demodulation; a frequency domain MRC module responsive to said MRC parameters and operative to perform phase adjustment in the frequency domain on the synchronization module output to combine the subcarriers, the first and second received baseband signals including a preamble format of a packet of information having a short training sequence (STS), a long training sequence (LTS) and signal (SIG) for training receivers, said preamble format having a physical layer identification to allow data to be received through the physical layer of a networking layer for communication, wherein the receiver system is operative to combine the OFDM modulated signals on the basis of each subcarrier using varying MRC parameters optimized for each subcarrier.