×

Apparatus and method of multiple antenna receiver combining of high data rate wideband packetized wireless communication signals

  • US 7,366,089 B2
  • Filed: 10/08/2003
  • Issued: 04/29/2008
  • Est. Priority Date: 10/08/2003
  • Status: Expired due to Fees
First Claim
Patent Images

1. An apparatus for combining of M high data rate wideband packetized OFDM wireless communication signals (“

  • M signals”

    ) to form a combined output signal, wherein at least M receive antennas each receive one of the M signals, wherein each of the M signals includes N frequency bins, and wherein M is an integer greater than or equal to 2 and N is a positive integer, the apparatus comprising;

    a joint timing recovery unit that performs joint coarse signal timing estimation and joint frequency offset estimation on digital data corresponding to each of the M signals;

    M Fast Fourier Transform (FFT) units that each convert the digital data for one of the M signals into frequency domain information in the form of sub-carrier data for each of N frequency bins for that one M signal and that output the frequency domain information for each of the M signals; and

    a combiner that weights and combines the frequency domain information of the M FFT units to thereby generate the combined output signal having reduced circuit impairments and channel effects,wherein the joint timing recovery unit that performs joint timing estimation determines a coarse end time for P consecutive Shorts within the M signals,wherein the joint timing recovery unit determines the coarse end time using self correlation of some of the P Shorts within the M signals,wherein the joint timing recovery unit includes a joint coarse signal time estimation unit that performs the joint coarse signal timing estimation on each of the M signals, the joint coarse signal time estimation unit comprising;

    M self-correlation units, wherein each self-correlation unit independently self-correlates the some of the P Shorts in one of the M signals after the automatic gain control unit indicates the start of the M signals and outputs for the one M signal a self correlation signal that is the self-correlation of the P Shorts, wherein P is a positive integer;

    M weighting units that weight the self correlation outputs based on the signal strength;

    a summer that sums the M weighted self correlation signals to obtain a weighted summed self correlation signal;

    a normalizing unit that normalizes the weighted summed self correlation signal, thereby outputting a normalized self correlation signal; and

    a coarse timing estimation unit that receives the normalized self correlation signal and obtains, for the M signals, the end time for the P Shorts in the M signals by comparing the normalized self correlation signal power to a threshold.

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×