Patent ID: 6115395
Filing Date: 2000-09-05
Classification: H04J,H04L,H04Q

Abstract:
A method of detecting the presence of signal impairments that introduce distortion in one or more time slots of a communication link comprising the steps of:receiving from the communication link a predetermined training sequence of signal points having a duration of at least one frame, each signal point comprising a sequence of bits, and said at least one frame comprises a plurality of time slots, and said sequence of bits of said received training sequence is distorted by the presence of the signal impairments in the communication link, whereby the distortion alters said sequence of bits;forming at least one impairment hypothesis for each of said plurality of time slots at a receiver, said at least one hypothesis being formed by altering bits of said predetermined training sequence to simulate one of a plurality of signal impairments to be detected;comparing said received training sequence of signal points with said at least one hypotheses; and,detecting the presence of signal impairments in each of said plurality of time slots in response to said comparison.