Channel sounding for a spread-spectrum signal

  • US 6,711,204 B2
  • Filed: 07/19/2001
  • Issued: 03/23/2004
  • Est. Priority Date: 01/14/1999
  • Status: Expired due to Term
First Claim
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1. An improvement to a spread-spectrum system having a base station and a plurality of remote stations (RS), with said base station (BS) for transmitting a plurality of BS-spread-spectrum signals at a first frequency and for receiving, at a second frequency, a plurality of RS-spread-spectrum signals transmitted from said plurality of remote stations, respectively, the improvement comprising:

  • said base station for transmitting a BS-channel-sounding signal at the second frequency;

    said plurality of remote stations for receiving the BS-channel-sounding signal at the second frequency, with said base station for transmitting the plurality of BS-spread-spectrum signals at the first frequency outside a correlation bandwidth of the plurality of RS-spread-spectrum signals transmitted by the plurality of remote stations at the second frequency; and

    said plurality of remote stations, responsive to the BS-channel-sounding signal, for compensating to the second frequency the respective plurality of RS-spread-spectrum signals.

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