Estimating frequency-offsets and multi-antenna channels in MIMO OFDM systems

DC CAFC
  • US 8,774,309 B2
  • Filed: 03/01/2013
  • Issued: 07/08/2014
  • Est. Priority Date: 05/21/2003
  • Status: Active Grant
First Claim
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1. A method comprising:

  • forming two or more blocks of output symbols for orthogonal frequency division multiplexing (OFDM) transmissions over two or more antennas, wherein the forming comprises encoding two or more blocks of information-bearing symbols for transmissions over the two or more antennas, and inserting training symbols and null subcarriers within the two or more blocks of information-bearing symbols at positions determined by a hopping code; and

    transmitting, via the two or more antennas, transmission signals in accordance with the two or more blocks of output symbols, wherein the two or more blocks of output symbols include a first block of output symbols and a second block of output symbols, and wherein transmitting the transmission signals comprises;

    transmitting, via a first antenna of the two or more antennas, a first transmission signal in accordance with the first block of output symbols; and

    transmitting, via a second antenna of the two or more antennas, a second transmission signal in accordance with the second block of output symbols.

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