Performance Analysis of Space Time Block Codes with Channel Coding

Abstract

Wireless systems are rapidly developing to provide high speed multimedia data transfer services that were traditionally offered by wired networks. To support these services, channels with large capacities are required. Theoretical investigations in the past few years have shown that very high capacities can be obtained by employing multiple antenna elements at both the transmitter and the receiver end of a wireless system. In multiple input and multiple output (MIMO) system of wireless communication, Space time block coding (STBC) is one of the attractive technique for high bit-rate and high capacity transmission. The advantage of space-time codes lies in the fact that diversity advantage is obtained by shifting the complexity of adding additional antennas to the transmitter while allowing the complexity of receiver to be reasonably low. Methods for providing transmit diversity in communication over fading channels also been concerned. The advantage of space-time codes lies in the fact that diversity advantage is obtained by shifting the complexity of adding additional antennas to the transmitter while allowing the complexity of receiver to be reasonably low.

Broadband wireless communication must cope with critical performance limiting challenges that include time-selective and frequency-selective channels, as well as power and bandwidth constraints. It has been observed that, STBC technique is not enough to achieve the code rate up to the Shannon limit. In this thesis channel coding is used along with Space time block coding ( STBC).

Recently, Convolutional codes (CC) have attracted much attention as the good error correcting codes achieving the near Shannon limit performance. In this thesis the concatenation scheme of STBC codes and CC (STBC-CC) is proposed and it has been shown that the STBC-CC can achieve the good error rate performance and coding gain. Referring to it as the STBC-CC, we evaluate the bit error rate (BER) of the STBC-CC with multiple transmit antennas in Rayleigh fading environments.