This paper presents a new family of turbo codes called multi-non-binary turbo codes (MNBTCs) that generalizes the concept of turbo codes to multi-non-binary (MNB) parallel concatenated convolutional codes (PCCC). An MNBTC incorporates, as component encoders, recursive and systematic multi-non-binary convolutional encoders. The more compact data structure for these encoders confers some advantag...

Turbo codes enable high quality communication links by offering exceptional error correction capabilities. Turbo coding is proposed in the coming Universal Mobile Telecommunication Systems (UMTS) standard by the 3GPP for high data rates channels. Direct realization of the Turbo decoder algorithm in hardware encounters many challenges, such as algorithm complexity, large silicon area, high power...

AND TURBO CODES Javier Garcia-Frias and John D. Villasenor Electrical Engineering Department University of California, Los Angeles Abstract|Hidden Markov models have been widely used to statistically characterize sources and channels in communication systems. In this paper we will consider their application in the context of turbo codes. We will describe simpli ed techniques for modifying a dec...

nels was computed. Wiberg [3] in his dissertation has W e model the density of extrinsic information in iterative turbo decoders by Gaussian density functions. This model is verified by experimental measurements. We consider evolution of these density functions through the iterative turbo decoder as a nonlinear dynamical system with feedback. Iterative decoding of turbo codes and of serially co...

Multi carrier modulation (MCM) technique is essential for next generation wireless mobile communication system, which achieves high data rate with high spectral efficiency and high flexibility. Orthogonal Frequency Division multiplexing (OFDM) introduces multicarrier concept in Code Division Multiple Access (CDMA) to give rise to novel concept of MC-CDMA system. The OFDM mitigates multiple acce...

Fading in wireless environments is a major obstacle to reliable communications. In order to mitigate the e ects of fading, channel coding is often employed. In this thesis, the performance and design of the channel coding technique, turbo codes, [1] is examined over Rayleigh fading channels. The thesis considers coherent BPSK signaling over both time-correlated and fully-interleaved Rayleigh, s...

Wireless communication at near-capacity transmission throughputs is facilitated by employing sophisticated Error Correction Codes (ECCs), such as turbo codes. However, real time communication at high transmission throughputs is only possible if the challenge of implementing turbo decoders having equally high processing throughputs can be overcome. This motivates the implementation of turbo deco...

Bit interleaved coded modulation employing asymmetric turbo codes is investigated. An asymmetric turbo code uses two different constituent codes. The benefit of using different constituent codes is that they may complement each other during iterative decoding of the asymmetric turbo code. This can be visualized using the input-output extrinsic information transfer (EXIT) chart based on mutual i...

Absfract-It has long been recognized that graphical representations of parallel concatenated codes contain loops. These loops make it extremely difficult to use the standard, probabilistic methods for graphs to obtain any insight as to the functionality of turbo decoding. Graphbased techniques do, however, lead to useful extensions and generalizations of the turbo decoding concept. In this pape...

Turbo codes have gained considerable attention since their introduction by Berrou and al. in 1993 due to their near capacity performance and low decoding complexity. The conventional turbo code is a parallel concatenation of two identical recursive systematic convolutional encoders separated by a pseudo-random interleaver. In this work, we propose a modified three Dimensional Turbo Code (3D-TCs...