The selection of the component codes of turbo codes has a major influence on the performance of these codes. In this paper we propose a new type of asymmetric turbo codes for medium length of interleaver, based on the selection algorithm for the generating polynomials matched to a largest spread QPP interleaver. From the performance results one can observe that the new asymmetric turbo codes pe...

The question raised in [15] is answered how to naturally model widely used forms of recursion by abstract machines. We show that turbo ASMs as defined in [7] allow one to faithfully reflect the common intuitive single-agent understanding of recursion. The argument is illustrated by turbo ASMs for Mergesort and Quicksort. Using turbo ASMs for returning function values allows one to seamlessly in...

| In this paper, we develop an iterative multiuser receiver for decoding Turbo coded synchronous CDMA signals in both Gaussian and non-Gaussian noise. A soft-input soft-output non-linear multiuser detector is combined with a set of single user channel decoders in an iterative detec-tion/decoding structure. The non-linear multiuser detector utilizes the prior probabilities of each user's bits to...

The publication of turbo codes in 1993 proved that there were error-correcting codes with performance close to the theoretical limit and which can be used in industrial products. Quickly, turbo codes have been adopted in several standards such as DVB-RCS, UMTS, CDMA2000 and 3GPP-LTE. The increasing demand for high throughput applications in broadband applications until 1 Gb/s and beyond is stro...

We propose a new class of information-coupled (IC) Turbo codes to improve the transport block (TB) error rate performance for long-term evolution (LTE) systems, while keeping the hybrid automatic repeat request protocol and the Turbo decoder for each code block (CB) unchanged. In the proposed codes, every two consecutive CBs in a TB are coupled together by sharing a few common information bits....

Due to their near Shannon-capacity performance, turbo codes have received a considerable amount of attention since their introduction [1]. They are particularly attractive for cellular communication systems and have been included in the specifications for both the WCDMA (UMTS) and cdma2000 third-generation cellular standards. At this time, the reasons for the superior performance of turbo codes...

Single-carrier linear modulation techniques combined with frequency-domain equalization provide a viable alternative to multicarrier techniques for combating multipath fading in channels with large delay spread. Such modulations tolerate frequency offset and have well controlled peak to average power ratio. They have comparable complexity to orthogonal frequency division multiplexing (OFDM) sys...

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 ...

Availability of channel state information (CSI) at any communication receiver is important for accurate detection and decoding of transmitted signals. Different types of algorithms have been proposed for the estimation of channel impulse response (CIR) of a time varying channel among which are the least mean square (LMS) and the recursive least square (RLS) algorithms. In this paper we propose ...

This paper compares the performance of a Turbo coded OFDM wireless link for SISO, SIMO, MISO and MIMO system with uncoded OFDM wireless link for SISO, SIMO, MISO and MIMO system in the in the presence of rayleigh fading. Turbo encoder encodes the input information bits and sends to QPSK or 16 QAM or 64 QAM modulator. Modulated symbols are mapped by STBC. Outputs of STBC are split into n streams...