Staged demodulation and decoding

Iterative Decoding / Demodulation

A receiver structure suitable for coded M-ary DPSK signals on static and time-varying channels is investigated. The transmitter consists of a convolutional code, an interleaver, and a diierential encoder, and hence represents a type of \serial turbo code". In the receiver, the kernel is an a posteriori probability (APP) demodulator. A priori information is accepted and reliability outputs are p...

On Joint Decoding and Random CDMA Demodulation

We consider a CDMA system on an additive white Gaussian noise (AWGN) channel with K concurrent users. Each user transmits equal-rate data and employs an LDPC error control code (ECC). Each user’s bits are modulated with a random spreading waveform. These spreading waveforms are furthermore partitioned in M sections which are in turn interleaved and spread in time. This creates a rate 1/M repeti...

Joint noncoherent demodulation and decoding for fast Rayleigh fading channels

Multiuser demodulation and iterative decoding for frequency-hopped networks

Demodulation and decoding for frequency-hopped spread-spectrum multiple-access (FH/SSMA) systems have been traditionally conducted by conventional single-user (noncollaborative) demodulation and errors and erasures correcting decoding techniques. In this paper, we study the demodulation and decoding aspects of collaborative multiuser reception for FH/SSMA and propose methods which increase the ...

"Turbo DPSK": iterative differential PSK demodulation and channel decoding

Multiple-symbol differential detection is known to fill the gap between conventional differential detection of PSK ( -DPSK) and coherent detection of -PSK with differential encoding ( -DEPSK). Emphasis has been so far on soft-input/hard-output detectors applied in uncoded systems. In this paper, we investigate a receiver structure suitable for coded DPSK signals on static and time-varying chann...