Abstract:

The Vertical Beil Laboratories Layered Space-Time(V-BLAST) is a multiple transmit and receive antenna system that provides very high capacity comparing to single antenna systems. Traditional detection algorithm for V-BLAST is based on Order Successive Interference Cancellation (OSIC) .the error propagation resulting from the low-diversity substreams constraints the overall system performance greatly using the OSIC algorithm. Using the algorithm that low-diversity substreams are iteratively decoded by using decisions form high-diversity substreams the performance is highly improved over the traditional one, but this algorithm needs too much iterative detection. For example, to the MIMO system with n transmit antennas the number of iterative detection are equal to n. The proposed new iterative detection algorithm for V-BLAST needs only three loops iterative detection to get the same high performance. For symmetric system where there is an equal number of transmit and recieive antennas simulation result show that there is a significant performance improvement comparing to the V-BLAST Order Successive Interference Cancellation (OSIC). On the other hand, since the number of iterative detection of the new algorithm is not very large, the complexity of the new algorithm is receivable.

Key words: vertical bell laboratories layered space-time, multiple transmitting and receiving antenna system, iteration detection