121 Generalized Versions of Turbo Decoding in the Framework of Bayesian Networks and Pearl's Belief Propagation Algorithm Peyman Meshkat and John D. Villasenor Electrical Engineering Department University of California, Los Angeles Abstract| We use the framework of Bayesian networks to introduce generalizations of the traditional turbo decoding algorithm. We show that traditional turbo decoding...

In Wyner-Ziv video coding (WZVC), powerful error correcting codes must be used to achieve high compression efficiency; turbo codes are the most commonly used error correcting codes in WZVC. To improve the turbo coding performance in the context of WZVC, this paper proposes a probability updating technique (PUT) acting as an outer loop of the common turbo decoding operation. Whenever a turbo dec...

Turbo codes are one of the most efficient error correcting code which approaches the Shannon limit. However the major drawback of turbo codes is its high latency due to its iterative decoding process. The high throughput in turbo decoder can be achieved by parallelizing several Soft Input Soft Output(SISO) units together. In this way, multiple SISO decoders work

The performance of the turbo codes can be improved by varying parameters such as block size, code polynomial structure and constraint length. This paper proposes a new asymmetric turbo codes that consists of parallel concatenated component codes with mixed type generator polynomials and also different constraint lengths. This scheme optimizes the BER performance of asymmetric turbo codes of bot...

In this paper, a modified optimal power allocation scheme for different bits in turbo encoder has been proposed to improve the performance of Turbo Codes system in High Speed Downlink Packet Access (HSDPA) service. In a typical turbo code in HSDPA system, an encoder with code rate of 1/3 was used with bit repetition scheme or puncturing system to achieve code rate of 1/4. In this study, the aut...

This survey paper presents various decoders for wireless sensor networks. Also reviewed many algorithms used for decoding purposes. Turbo codes have been recognized as a milestone in the channel coding theory. These are a class of error correcting codes that come closer to Shannon’s limit than any other class of error correcting codes. Due to their outstanding error-correcting capabilities, tur...

In this paper, an efficient partial incremental redundancy (P-IR) scheme is proposed for an H-ARQ using block type low density parity check (B-LDPC) codes. The performance of the proposed P-IR scheme is evaluated in an HSDPA system using IEEE 802.16e B-LDPC codes. Simulation results show that the proposed H-ARQ using IEEE 802.16e BLDPC codes outperforms the H-ARQ using 3GPP turbo codes. key wor...

Abstract: In this paper the desired turbo coding rates providing methods using the puncturing process and also the effect of this process on BER and FER performances are presented. The performances of the RSC turbo codes with puncturing and without puncturing having the same component codes are compared. The methods of the parity bits puncturing are investigated. In all cases we used the same m...

Today’s mobile information society has a steady demand for everincreasing data rates and better quality-of-service in wireless systems. To meet this demand standards organizations involved with the wireless industry are increasingly relying on modern high-performance channel codes such as low-density parity-check (LDPC) and turbo codes. These forward error-correction codes achieve near-optimal ...