General Abba Space-time Block Code Algorithm And Its Hardware Implementation

Space-time processing has always been an active area in the communication field. In recent years, it demand higher transmission rates and higher quality due to the explosive development of the wireless communication, the traditional Time-Frequency signal processing has been very difficult to meet these needs. Fortunately, using multiple antennas at both transmits and receives in wireless communication systems can increase system capacity and improve spectral efficiency effectively, and it is also an effective means of anti-fading. Which structure we call multiple-input multiple-output, MIMO for short. Naturally, the space-time coding based on multi-antenna system bear the brunt of becoming a research hotspot, and it is considered the key technology to next-generation mobile communication.In a number of space-time coding technique, the orthogonal space-time block code (OSTBC) is able to achieve full transmit diversity gain and full-rate, and its lower complexity of decoding algorithm; these advantages make it an important coding techniques in MIMO system. From the development of space-time block code, the research base on its performance has become increasingly saturated, more research is focused on improving their coding structure and reduce decoding complexity when large-scale antenna configuration. The generalized ABBA space-time block code of this study is a new proposed quasi-orthogonal space-time block codes, which can achieve full-rate and full-diversity, and it also can be constructed and applied to any number of antenna array configuration. What's more, the GABBA STBC overcome the OSTBC existing shortcomings that the complex signal can not be achieved full-rate transmission when the antennas are greater than 2. And its decoding using quasi-orthogonal decoding algorithm, the decoding performance loss small and decoding complexity increases linearly with the number of antennas. In addition, these articles combine the GABBA space-time block codes and OFDM modulation technologies, to overcome the multipath effects of wireless communication.Channel coding technology as an important means to improve the reliability of communication systems has been widespread concern. The low density parity check codes which approach the Shannon limit, because this good properties and low decoding complexity, it is being more and more attention. This article will combine the GABBA space-time code technology with Q-ary LDPC channel coding technology to reduce the system bit error rate, and joint optimization to improve the system performance.In this paper, the research about the FPGA implementation of GABBA also been done. Combine with an example of 4 transmit antennas and 4 receive antennas GABBA system, given a concrete realization process of encoding and decoding, and also proposed a number of methods to optimal design.This study about the GABBA can be extended to other more sophisticated communication systems, such as combining with pre-coded used in the mult-point collaborative communication systems.