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A serially concatenated code with an interleaver consists of the cascade of an outer code, an interleaver permuting the outer codewords' bits, and an inner code whose input words are the permuted outer codewords. The construction can be generalized to h cascaded codes separated by h − 1 interleavers. We obtain upper bounds to the average maximum-likelihood(More)
A parallel concatenated coding scheme consists of two simple constituent systematic encoders linked by an interleaver. The input bits to the rst encoder are scrambled by the interleaver before entering the second encoder. The codeword of the parallel concatenated code consists of the input bits to the rst encoder followed by the parity check bits of both(More)
— Concatcnateci coding schemes consist of the combination of two or more simple co flslil[4ctlt rflcoder.v and intcrlcavcrs. The parallel concatenation known as " tLlrbo code " has been shown to yiclcl remarkable cociing gains close to theoretical limits, yet admitting a relatively simple iterative clccocling tcchniqLlc. The recently proposed serial(More)
57 Absfracr-Conventional techniques attempting to compensate for the influence of linear and nonlinear distortion in digital satellite channels include optimization of channel filtering. With conventional linear filtering it has been experienced that there is still room for considerable improvement, so that it appears reasonable to investigate some forms of(More)
Concatenated coding schemes with interleavers consist of a combination of two simple constituent encoders and an interleaver. The parallel concatenation known as " turbo code " has been shown to yield remarkable coding gains close to theoretical limits, yet admitting a relatively simple iterative decoding technique. The recently proposed serial(More)
A parallel concatenated convolutional coding scheme consists of two constituent systematic convolutional encoders linked by an interleaver. The information bits at the input of the rst encoder are scrambled by the interleaver before entering the second encoder. The codewords of the parallel concatenated code consist of the information bits followed by the(More)
Soft-input soft-output building blocks modules are presented to construct and iteratively decode in a distributed fashion code networks, a new concept that includes, and generalizes, various forms of concatenated coding schemes. Among the modules, a central role is played by the SISO module and the underlying algorithm: it consists of a four-port device(More)
In this paper, we propose a new solution to parallel con-catenation of trellis codes with multilevel amplitude/phase modulations and a suitable bit by bit iterative decoding structure. Examples are given for throughput 2 and 4 bits/sec/Hz with 8PSK, 16QAM, and 64QAM modulations. For parallel concatenated trellis codes in the examples, rate 2/3 and 4/5, 8,(More)