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

Unlike the usual turbo codes, “unifilar turbo codes” are based on only one underlying trellis code. If terminated (i.e., as block codes), they perform as well as (ordinary) turbo codes; if not termina ted (i.e., as convolutional codes), they are attractive for continuous transmission under tight delay

The current paper addresses the issue of estimating the sampling instant in turbo receivers. The proposed synchronizer is based on the expectation-maximization (EM) algorithm and takes benefit from the soft information delivered by the turbo system. Performance Interpolator Anti−aliasing Turbo Demodulator Matched filter a posteriori information Discrete Time 1 Ts rl r(t)

This paper deals with “Turbo codes”. The turbo code encoder is built using a parallel concatenation of two RSC codes and associated decoder is SOVA. Simulation carried out for different BER, iterations, constraint lengths and frame sizes (FS) to show performance properties of turbo codes in AWGN channel and using binary shift keying modulation. .

Power line channel often suffers from impulsive interferences generated by electrical appliances. Therefore, power line communication (PLC) makes the degradation due to such the impulsive interferences. Middleton’s Class A noise model is frequently utilized for the modeling of such the impulsive noise environment. In this paper, we deal with turbo decoding for turbo codes over additive white Cl...

In this article, we describe the information geometrical understanding of the belief propagation decoder, especially of the turbo decoding. The turbo decoding was proposed by Berrou et al. early in 90’s, and many studies have been appeared on this practical and powerful error correcting code. Even though many experimental results support the potential of the turbo decoding, there is not suffici...

In this paper we present an improved error correction approach for digital audio watermarking. It uses a turbo coding algorithm that takes into account temporal variations of the host audio’s statistical properties, using a turbo decoder that estimates the unknown host audio distribution in the watermarked audio. Experimental results showed nearly one order of magnitude of the BER decrease duri...

For evolution of the GSM/EDGE radio access network (RAN), the use of higher order modulation like 16and 32-ary quadrature amplitude modulation (QAM) is considered in standardization for increased peak data rates and reduced transmission delays. In this paper, an optimized receiver design for different packet data transmission schemes is proposed. Turbo coding and turbo equalization is discussed...

Since their discovery in 1993, turbo codes have been found to provide excellent performance with relatively low complexity. Turbo codes have been added to the Consultative Committee for Space Data Systems (CCSDS) standards for telemetry channel coding, and turbo encoders are being included in spaceflight hardware and software. This article describes the design of the prototype turbo decoder for...