Some wireless message systems such as IS54, improved data rates for the GSM evolution (EDGE), universal interoperability for microwave access (WiMAX) and long term evolution (LTE) have adopted low-density parity-check (LDPC), tail-biting convolutional, and turbo codes as the forward error correcting codes (FEC) scheme for data and overhead channels. Therefore, many efficient algorithms have bee...

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...

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...

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...

The performance and design of turbo codes using coherent BPSK signaling on the Rayleigh fading channel is considered. In low signal-to-noise regions, performance analysis uses simulations of typical turbo coding systems. For higher signalto-noise regions beyond simulation capabilities, an average upper bound is used in which the average is over all possible interleaving schemes. Fully interleav...

The general problem of estimating the a posteriori probabilities of the states and transitions of a Markov source observed through a discrete memory less channel is considered. The decoding of linear block and convolutional codes to minimize symbol error probability is shown to be a special case of this problem. An optimal decoding algorithm is derived. In information theory, turbo codes (origi...

In this paper we study adaptive power allocation (PA) policies for improving the performance of convolutional and turbo codes on fading channels. The transmitter has an average power constraint. The fading process can he continuous (e.g. Rayleigh distribution). Perfect channel state information at the transmitter (CSIT) and the receiver (CSIR) are assumed. For convolutional codes, we consider b...

Numerous wireless contact systems such as IS-54, superior data tariff for the GSM succession (EDGE), universal interoperability for microwave access (WiMAX) and long term progression (LTE) have adopted low-density parity-check (LDPC), tail-biting intricacy, and turbo codes as the forward error correcting codes (FEC) method on behalf of information and transparency channels. Consequently, severa...

With the increasing demand for high-speed communications systems, forward error correction (FEC) codes and signal processing techniques receive much attention. FEC is a mathematical method for introducing redundancy in a data stream or data block to protect information symbols against potential errors during transmission through a communications channel. A major breakthrough in FEC was achieved...