Research On The Key Technology Of V-BLAST Receiver Over MIMO Channels

It is the highest goal of humanity intercommunion to communicate with anybody, by any way, and anywhere. Of course, this grand goal is a stern challenge for the future wireless communications system. The MIMO technology can enormously improve the frequency spectrum efficiency and the wireless link quality for the wireless communications system by employing multiple antenna at both transmitter and receiver. It is regarded as the one of most promising technologies in the future wireless communications field.The Vertical Bell Labs Layered Space-Time (V-BLAST) technology is the first MIMO experiment system, is also the most representative MIMO system. V-BLAST scheme can achieve very high spectral efficiency, and can be implemented easily. Therefore it adopted by 3 GPP standard, has also become a research focus. However, so far the most research about V-BLAST is limited to narrowband model. A lot of detection algorithms for V-BLAST in a flat-fading channel is proposed, but these algorithms have some shortcomings. Some algorithms with good detection performance have a higher computational burden. At the same time, for some algorithms with lower computational complexity, its detection performance is not satisfying. In addition, in order to implement the high speed wireless multimedia communication, it is necessary to enhance the data transmission rate further. So MIMO channels in V-BLAST system become frequency-selective channel inevitably. Hence, extend the research on V-BLAST from flat-fading environment to frequency-selective fading environment has a necessity very much. However, existing detection algorithms for V-BLAST over frequency-selective channels have a shortcoming that is the higher computational burden. Therefore, the objective of this thesis is to improve MIMO system performance from the angle of computational complexity. Both detection and receive technologies for V-BLAST are key research direction of this thesis.The innovations and research contents of this thesis are as the follows: 1) For the V-BLAST in flat-fading channel, originally detection algorithms and a...