Method and apparatus for implementing carrierless amplitude/phas

Details Method and apparatus for implementing carrierless amplitude/phas Method and apparatus for implementing carrierless amplitude/phas

1994-11-08

1997-03-04

Chin, Stephen

Pulse or digital communications

Transceivers

375261, 370201, H04L 516, H04L 512

Patent

active

056087551

ABSTRACT:
A method and apparatus for (1) transmitting large amounts of data between a least a first and second station over a twisted pair, (2) reducing cross talk in a network using carrierless amplitude modulation and phase modulation encoding (CAP) with independent data clock source at each station, (3) providing a relatively simple and fast data detection apparatus, (4) maintaining synchronization between stations during idle periods while minimizing cross talk, (5) providing a technique to allow filters to be trained during idle periods, and (6) providing a technique which allows automatic gain control to be used with CAP. Particular signalling symbols are associated with each of the following conditions: (1) idle state, (2) preamble, (3) start of frame detection, (4) test condition, (5) each possible combination of five binary bits representing 32 different data symbols, and (6) jam condition. For example, a unique pair of the four inner most points on the CAP 36 constellation are used for indicating idle mode. All four inner most points are used for testing the link and training the filters in the receiver.

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