Method of selecting and switching signal paths in a digital communication system

  • US 5,742,646 A
  • Filed: 05/05/1995
  • Issued: 04/21/1998
  • Est. Priority Date: 05/05/1995
  • Status: Expired due to Term
First Claim
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1. A method of switching from one signal path to another signal path in a digital communication system, the method comprising the steps of:

  • (a) receiving a digital signal in a first signal path in a communication system;

    (b) receiving the digital signal in a second signal path in the communication system;

    (c) estimating the number of bits in error in the digital signal received in each of the first signal path and the second signal path during a predetermined time period before providing the digital signal for forward error correction,wherein at least a predetermined number of bits would be received in error in the predetermined time period if a first bit error rate were exceeded;

    (d) in the event the first bit error rate is not exceeded in signals in either of the first and second signal paths in the predetermined time period, comparing the number of estimated bits in error in the two signal paths after the end of the predetermined time period, andindicating to a switch for selecting one of the two signal paths that the signal path with the lower number of estimated bits in error is to be selected; and

    (e) in the event the first bit error rate is exceeded in a signal in one of the first and second signal paths during the predetermined time period, indicating to the switch that the signal path with the signal with the lower number of bits in error is to be selected before the end of the predetermined time period.

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