TURBO DECODING TECHNIQUES

摘要

Techniques are disclosed for turbo decoding orthogonal frequency division multiplexing (OFDM) symbols. Techniques for combined turbo decoding and equalization are disclosed. The disclosed techniques can be implemented in receivers that receive wired or wireless OFDM signals and produce data and control bits by decoding the received signals. The techniques may be incorporated within an ADSL or a VDSL receiver.

主权项

1. A turbo decoding method for decoding a stream of a plurality orthogonal frequency division multiplexing (OFDM) symbols in which a plurality of constellations are generated by block coding and trellis coding a first number of least significant bits and only block coding a second number of most significant bits, comprising:
receiving the plurality of orthogonal frequency division multiplexing (OFDM) symbols; demodulating the plurality of OFDM symbols to obtain a plurality of signal constellations having variable sizes inputting, to a soft input soft output (SISO) constellation demapper, the plurality of signal constellations, along with information about a number of bits represented by each constellation from the plurality of signal constellations; and operating a soft input soft output (SISO) constellation demapper on constellations of variable sizes to generate an output for subsequent soft decoding.