Patent ID: 7693238
Filing Date: 2010-04-06
Classification: H04B,H04L

Abstract:
1. A method for V-BLAST (Vertical Bell Labs Layered Space Time) detection, the V-BLAST system being a Multiple-Input Multiple-Output (MIMO) system that includes multiple transmitting and receiving antennas, the data being transmitted from the multiple transmitting antennas simultaneously as multiple data layers, each data layer being derived from same signal constellation, the data received at a receiver being in the form of a vector, the method comprising the steps of: a. calculating a matrix on the basis of channel matrix of the V-BLAST system; b. updating the channel matrix by deleting a column that corresponds to a maximum diagonal entry of the matrix, the maximum diagonal entry corresponding to a minimum post-detection Signal to Noise Ratio (SNR); c. calculating γ updated received vectors for a data layer, the data layer corresponding to the maximum diagonal entry, γ being the size of the signal constellation, the updated received vectors being calculated for all possible constellation points of the signal constellation of the data layer, the data layer corresponding to the maximum diagonal entry corresponds to the minimum post-detection SNR; d. performing Successive Interference Cancellation (SIC) iterations for each updated received vector for decoding the remaining data layers, the SIC being performed using the updated channel matrix until each data layer is decoded; e. obtaining a set of reduced possible solution vectors from the SIC iterations; and f. detecting a solution vector nearest to the received vector from the set of the reduced possible solution vectors, the nearest vector being detected by performing Maximum Likelihood (ML) search on the obtained set of the reduced possible solution vectors.