Patent ID: 7292654
Filing Date: 2007-11-06
Classification: H04L

Abstract:
1. An apparatus, comprising: at least one soft input-soft output (SISO) demodulator configured to receive input information and feedback information and to produce inner decoded information, wherein said at least one SISO demodulator is configured to perform decoding operations based on a two-state trellis corresponding to a recursive encoder and a signal mapping with four output waveforms in order to produce said inner decoded information, wherein each of the four output waveforms is an average of a corresponding group of full-symbol Feher-Patented Quadrature Phase Shift Keying (FQPSK) waveforms; at least one SISO outer decoder configured to receive a deinterleaved version of said inner decoded information and generate outer decoded information; wherein said feedback information is obtained from the outer decoded information; wherein said apparatus is configured to use the feedback information to iteratively demodulate and decode said input information.