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Arrangement for canceling interference in transmission systems

  • US 4,982,428 A
  • Filed: 12/29/1988
  • Issued: 01/01/1991
  • Est. Priority Date: 12/29/1988
  • Status: Expired due to Fees
First Claim
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1. In a communication system for exchanging digital symbols between terminals over a bidirectional transmission path, the method for removing a prescribed interference component in a signal received at a terminal comprising the steps of:

  • storing a sequence of successive digital symbols 1, 2, . . . , N applied to the bidirectional transmission path in successive symbol time periods,generating a replica signal representative of the prescribed interference component in the received signal subsequent to the symbol time periods of the stored sequence of successive digital symbols; and

    combining the replica signal with the received signal to cancel the prescribed interference component in the received signal subsequent to the time periods of the sequence of successive digital symbols;

    the step of generating the prescribed interference component replica signal includingselecting the Nth stored symbol in the sequence in each symbol period of the received signal,forming an adaptive gain signal corresponding to the correlation of the replica signal and the signal representative of the received signal with the prescribed interference component removed in each symbol time period,modifying the Nth stored symbol by the adaptive gain signal, and recursively altering the modified Nth symbol with an expontentially decreasing infinite impulse response corresponding to the characteristics of the bidirectional transmission path subsequent to the time period of the Nth digital symbol of the sequence of successive digital symbols.

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