Turbo codes

Armed with soft-input soft-output decoding, powerful turbo code was born. We briefly discuss parallel-concatenated turbo coding. Iterative or turbo principle is. These codes have been invented at.

What are turbo codes ? Turbo codes, which belong to a class of Shannon-capacity approaching error. Turbo code is a kind of error correction code (ECC) with nice performance of checking and correcting errors.

It is widely used in mobile communications and. They are based on the transmission of the initial message in. Conventional turbo codes are parallel concatenated recursive systematic convolutional codes. Two convolutional encoders are connected by a large enough.

The trellis of the code describes its valid codewords in terms of paths through a trellis with labelled edges. A fourth way of describing some block codes, the. An Introduction to Coding Theory. In its simple form, a turbo encoder consists of two constituent systematic encoders joined together by means of an interleaver.

It discusses the underlying concepts and presents. The error correction capability of a convolutional code increases when the length of the encoding register increases.

The new error correction coding scheme, named turbo codes, has revolutionized error-correction coding. This is shown in Figure 7. The new scheme let engineers design systems that are. The Turbo code concept was first introduced by C. The name was derived from an iterative decoding algorithm used to decode these codes.

Recursive systematic convolutional (RSC) codes and nonuniform interleavers commonly used in turbo code encoder design are analyzed. Fundamentals such as. An algorithm for improved error correction of the data protected using standard security mechanisms, like Message Authentication Codes. The two recursive convolutional codes are called the constituent codes of the turbo code.

The outputs of the constituent encoders are punctured and repeated to. An approach is provided for encoding information bits to output a coded signal using turbo code encoding with a low code rate. Classical turbo codes, introduced by Berrou et al.

CTCs use highly-powerful iterative decoding to achieve performance. Convolutional Turbo Codes (CTCs). The success of LDPC and turbo codes is mainly due to the efficient iterative decoding algorithm.

Many efficient VLSI architectures for LDPC decoders have been. The performance of turbo codes in quasi- static fading channels both with and without antenna diversity is investigated. The structure of the consituent codes and the turbo interleaver are defined in the specifications.

In particular, simple analytic techniques. TURBO_DEC_STD is an iterative soft metric turbo decoder with. Sadjadpour "Maximum a posteriori decoding algorithms for turbo codes ", Proc.