Mode selective quadrature amplitude modulation communication...

Details Mode selective quadrature amplitude modulation communication... Mode selective quadrature amplitude modulation communication...

H - Electricity

04

L

H04L 27/38 (2006.01) H04L 27/00 (2006.01) H04L 27/34 (2006.01) H04L 1/00 (2006.01)

Patent

CA 2091814

A quadrature amplitude modulation (QAM) communication system is provided in which data can be communicated in any one of a plurality of QAM modes, such as 16-QAM, 32-QAM, and 64-QAM (30). A receiver (70) detects the particular QAM mode transmitted on a trial and error basis, by attempting to decode the received data using different QAM modes until a synchronization condition is detected. The synchronization condition can require that a plurality of different synchronization tests be met. In a specific embodiment, a first synchronization test is met when a renormalization rate of a trellis decoder (90) is below a threshold value. A second synchronization test is met when a first synchronization word is detected in the received data. A third and final synchronization test is met when a second synchronization word is detected in the received data. In order to reduce the cost of the receiver, most of the QAM mode dependent components (76, 80, 84, 90, 98, 102) are implemented using look-up tables stored in PROMs.

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