in this paper, we propose space-time block codes based on constituent intersectant orthogonal designs. after channel model is formulated, we studied the space-time block codes from constituent intersectant orthogonal designs. at last we made simulations for the space-time block codes from complex orthogonal design and the space-time block codes from constituent intersectant orthogonal design to...

In this paper we propose a sub-block retransmission scheme for ARQ and hybrid ARQ schemes. When the channel is quiet the sub-block retransmission scheme behaves like a conventional ARQ or hybrid ARQ scheme. As the channel is becoming noisy, the data block is divided into small sub-blocks for transmission. Each sub-block is encoded for error control by an appropriate shortened code and the code ...

Block diagram languages provide an effective approach to developing Digital Signal Processing applications. The tools that support block diagram languages use existing compilation systems to produce code. The inefficiencies of the compilation systems are compounded with inefficiencies interfacing to them. Generation of intermediate code direct from the block diagram bypasses these inefficiencie...

l . INTRODUCTION A class of double error correcting linear convolutional codes are given. T h e codes are derived from double-error-correct ing tr iple-error-detect ing extended BCH codes. T h e codes being proposed are not covered by previous works ([7], [2], [3]). Error propagation in the proposed codes is discussed. For the sake of simplicity of arguments only binary codes are discussed. Ext...

In this paper we present a new Turbo analog error correcting coding scheme for real valued signals that are corrupted by impulsive noise. This Turbo code improves Donoho’s deterministic construction by using a probabilistic approach. More specifically, our construction corrects more errors than the matrices of Donoho by allowing a vanishingly small probability of error (with the increase in blo...

In this correspondence, we investigate two important structural properties of block 2tary PSK modulation codes, namely: linear structure and phase symmetry. For an AWGN channel, the error performance of a modulation code depends on its squared Euclidean distance distribution. Linear structure of a code makes the error performance analysis much easier. Phase symmetry of a code is important in re...

Quasi-Orthogonal Space-Time Block Code presents an up-to-date, comprehensive and in-depth discussion of an important emerging class of space-time codes, called the Quasi-Orthogonal STBC (QO-STBC). Used in Multiple-Input Multiple-Output (MIMO) communication systems, they provide transmit diversity with higher code rates than the well-known orthogonal STBC (OSTBC), yet at lower decoding complexit...

Transmission power adaptations are considered in a space-time block code (STBC) system utilizing feedback channel gain informations. We investigate the optimal power adaptation scheme that minimizes the average BER subject a fixed average transmission power constraint. We present the power gain provided by the optimal adaptation scheme over the conventional STBC without power adaptation. The po...