QAM spread spectrum demodulation system

Details QAM spread spectrum demodulation system QAM spread spectrum demodulation system

1996-07-31

2000-07-11

Bocure, Tesfaldet

Pulse or digital communications

Receivers

Angle modulation

375373, 329304, H04L 2714, H04L 2716

Patent

active

060884029

ABSTRACT:
A demodulation arrangement is disclosed which comprises a mixing circuit for deriving in-phase (I) and quadrature (Q) signals in a digital form from a received signal. The I and Q signals can then be input to a look-up table configured to output at least a data output value corresponding to a symbol constellation point and a corresponding phase output value, both selectable using. A phase processor is arranged to receive the phase output value and to calculate a phase angle value of the received signal. The phase angle value is returned as a further input to the look-up table to supplement the I and Q signals for selection of at least the data output value.

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