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Wireless communication system using block filtering and fast equalization-demodulation and method of operation

  • US 7,075,967 B2
  • Filed: 04/20/2001
  • Issued: 07/11/2006
  • Est. Priority Date: 01/19/2001
  • Status: Expired due to Term
First Claim
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1. For use in a base station (BS) of a fixed wireless network capable of communicating with a plurality of subscriber transceivers via time division duplex (TDD) channels, a BS transceiver comprising:

  • a receiver front-end capable of receiving data burst transmissions from said plurality of subscriber transceivers in an uplink portion of a TDD channel, wherein said receiver front-end demodulates said received data burst transmissions into a digital baseband signal in-phase I signal and a digital baseband quadrature (Q) signal;

    a first frequency domain feedforward equalization filter capable of receiving said I signal and performing a Fast Fourier Transform on a block of N symbols in said I signal to produce a first symbol estimate sequence;

    a second frequency domain feedforward equalization filter capable of receiving said Q signal and performing a Fast Fourier Transform on a block of N symbols in said Q signal to produce a second symbol estimate sequence;

    an adder capable of receiving said first symbol estimate sequence on a first input and said second symbol estimate sequence on a second input and producing a combined symbol estimate sequence;

    a slicer capable of receiving and quantizing said combined symbol estimate sequence to produce a sequence of decided symbols; and

    a time domain RAKE feedback filter capable of receiving said sequence of decided symbols and generating a symbol correction sequence that is applied to a third input of said adder.

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