In this paper, we investigate a coded solution to compensate for the nonlinear distortion of TDMA satellite waveforms. Based on a Volterra-type channel model and the turbo principle, we present a turbo-like system that includes a simple rate-1 encoder at the transmit side in addition to a conventional channel encoder; the receive side iteratively equalizes the nonlinear channel effect and decod...

— In order to have reliable communication, channel coding is often employed. Turbo code as a powerful coding technique has been widely studied and used in communication systems. Turbo coding is an advanced forward error correction algorithm. A standard component in third generation (3G) wireless communication systems. Third generation (3G) mobile communication systems aim to provide a variety o...

In this paper, we define a stopping set of turbo codes with the iterative decoding in the binary erasure channel. Based on the stopping set analysis, we study the block and bit erasure probabilities of turbo codes and the performance degradation of the iterative decoding against the maximum-likelihood decoding. The error floor performance of turbo codes with the iterative decoding is dominated ...

For the construction of low rate turbo– codes, the concept of multiple parallel concatenated codes, i.e. the “multiple–turbo–code” has been successfully employed e.g. in [13, 16]. Analysis of this structure has been done via simulations [16] or the analysis of equivalent coding schemes [13]. In this paper we extend the method of EXIT charts [5], that has been applied to multiple–turbo–codes con...

It is known that one of the essential building blocks of turbo codes is the interleaver and its design using random, semi-random (S-Random) and deterministic permutations. In this paper, two new types of turbo code interleavers, Enhanced Block S-Random (EBSR) interleaver is proposed. The design algorithm for the new interleaver is described in depth, and the simulation results are compared to t...

 Turbo-detection applies the “turboprinciple” to iterative equalization and decoding of data transmitted via frequency selective channels. The performance of turbo-detection strongly depends on the ISI (Intersymbol Interference) introduced by the modulator and the waveform channel. In order to achieve higher data rates within GSM (Global System for Mobile Communications), 8PSK modulation will ...

Turbo-Codes will most likely be employed in future radio systems as a channel coding scheme for highrate data services. However, Turbo-Decoding is a comparatively complex task. To obtain efficient decoder implementations, the system design space has to be explored on multiple levels. In this paper, we span the system design space for Turbo-Codes and describe a method of exploration, while focus...

Turbo coding is the most commonly used error correcting scheme in wireless systems resulting in maximum coding gain. In this paper, a comparative study of the symbol-bysymbol maximum a posteriori (MAP) algorithm, its logarithmic versions, namely, Log-MAP and Max-Log-MAP decoding algorithms used in SISO Turbo Decoders are analyzed. The performance of Turbo coding algorithms are carried out in te...

We propose a method for jointly performing timing recovery and turbo equalization on partial response channels with error-correction codes. The proposed detector uses soft decisions from previous turbo iterations to improve timing estimates before the next, and each iteration is only marginally more complex than that of a conventional turbo equalizer. As compared to a conventional receiver with...