Multiplex communications – Communication techniques for information carried in plural... – Combining or distributing information via time channels
Patent
1997-10-06
2000-09-05
Horabik, Michael
Multiplex communications
Communication techniques for information carried in plural...
Combining or distributing information via time channels
370522, 370250, 370458, H04J 312
Patent
active
061153958
ABSTRACT:
A method of detecting the presence of signal impairments that introduce distortion in one or more time slots of a communication link by comparing a received training sequence of signal points with hypothetical received signal points, where the hypothetical points are predistorted versions of the training sequence, and are based on the known, predetermined training sequence of signal points. A detection matrix is formed where one dimension of the matrix corresponds to a time slot within a frame, preferably six time slots to a frame, and the other dimension corresponds to a particular impairment, or combination of impairments. The individual signal impairments are generally one or more of the following: robbed bit signaling where the robbed bit is replaced with a logic `0`; robbed bit signaling where the robbed bit is replaced with a logic `1`; robbed bit signaling where the robbed bit is replaced with a logic `1/2`; 3 dB digital attenuator; 6 dB digital attenuator. The hypotheses are based on individual impairments and combinations/permutations of these impairments. The minimum value of each column (corresponding to a time slot within the frame) of the detection matrix indicates the type of impairment in that time slot.
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Alelyunas Carl H.
Lery Scott A.
Norrell Andrew L.
Parizhsky Vladimir G.
Waldron Mark A.
3Com Corporation
Horabik Michael
Jones Prenell
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