Performance Evaluation of the Layered Space-Time Receiver Using the QR Detection Method

The conventional V-BLAST detection is a single flow algorithm that consists of the two major operations: 1) the finding of the ordering index and 2) the nulling and symbol cancellation process. This paper focuses on the second operation and provides an alternative way for the nulling and symbol cancellation process using the QR decomposition to modify the V-BLAST algorithm for another way of effective detection. The decomposition of the channel matrix into the orthonormal matrix Q and the triangular matrix R have created a way of achieving symbol cancellation by means of backward substitution. Results are presented for various system configurations that demonstrate the performance of rearranging the channel matrix using the proposed method as compared to random ordering.