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As a special class of space-time code, space-time trellis coding (STTC) can achieve the best compromise of coding complexity, performance and bandwidth efficiency. In the paper, we present a MIMO-OFDM system model basing on the STTC. Firstly, we generally describe the framework and the basic principles of the STTC-MIMO-OFDM system. Then simulation is performed under the case of different time delay,...
The multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) communication systems can provide high data rate. Since channel estimation is an integral part of the receiver designs in coherent MIMO-OFDM systems, it is important to understand the basis of the channel estimation technologies. The basic system models are constructed for the MIMO-OFDM communication systems...
Inter symbol interference (ISI) and Inter carrier interference (ICI) are widespread in the orthogonal frequency division multiplexing (OFDM) communication systems. This paper mainly discusses the ISI mitigation in MIMO-OFDM systems. Combining with the V-BLAST method, we use a decision feedback technique for ISI cancelation and a cyclic reconstruction technique for ICI removal. Simulation results show...
Space Time Trellis Code is based on a combination of the delay diversity and the TCM Codes. It is helpful to use Space Time Trellis Code to improve the wireless transmission rate and the reliability. The model, the encoding method and the decoding algorithm of the Space Time Trellis Code systems are discussed in this paper. Then, the trellis of Space Time Trellis Code is analyzed and the coding process...
This paper introduces the famous transmit diversity antenna scheme called Alamouli at first. And then, it considers the theory of the Space Time Block Code (STBC) and compares several different methods about the STBC decoding scheme. At last, simulations are used to examine the accuracy of the STBC coding and decoding schemes.
Inter carrier interference (ICI) are widespread in the orthogonal frequency division multiplexing (OFDM) communication systems. This paper mainly discusses two ICI self-cancellation algorithms, the data-conversion based ICI self-cancellation algorithm and the data-conjugate based ICI self-cancellation algorithm. The properties and the application environments are also given. Simulation results show...
Layered space-time code technique is a good scheme to improve the wireless transmission rate and reliability. The paper discusses four detection algorithms for the Vertical-Bell Laboratories Layered Space-Time (V-BLAST) system. Then, it analyzes the process of algorithms in detail and simulates them. The bit error rate (BER) for the four detection algorithms in different channel situations are compared.
In cellular network, the deployment of the relay station can bring spatial diversity to increase link capacity and improve communication performance. In this paper, we consider an optimal power allocation scheme for the source and the relay to minimize the bit error rate (BER) at the destination under the power and outage constraint in cooperative relay system. Simulation results show that the BER...
A framework of video transmissions over 3G wireless channels based on RCPC and FEC is proposed, which can cope with the bit error and packet loss occurred in transmission. The bit error model and packet loss model are used to estimate the bit error rate and packet loss rate, with which the RCPC code and FEC code is adjusted, and the datum are divided into the same length packet to be transmitted....
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