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Using orthogonal waveforms to enable multiple transmitters to share a single CDM channel

  • US 6,134,215 A
  • Filed: 04/02/1996
  • Issued: 10/17/2000
  • Est. Priority Date: 04/02/1996
  • Status: Expired due to Term
First Claim
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1. A method of enabling a plurality of transmitters to share a single code division multiplexed (CDM) channel in a CDM communications system, each transmitter having a plurality of communications channels for transmitting a plurality of data signals, comprising the steps of:

  • assigning a predefined set of orthogonal channelizing codes to the plurality of transmitters in a predetermined manner;

    at each transmitter;

    channelizing each of the plurality of data signals using one of the orthogonal channelizing codes to produce a plurality of channelized data signals;

    spreading the plurality of channelized data signals using at least one pseudonoise (PN) code to produce a plurality of spread data signals;

    summing the plurality of spread data signals prior to transmission to produce a composite signal; and

    frequency precorrecting the composite signal prior to transmission such that the composite signal is frequency-aligned upon reception.

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