PROCESS FOR COMPUTING CHANNEL QUALITY INDICATOR (CQI) IN A SPATIAL MULTIPLEXED MIMO WIRELESS COMMUNICATION SYSTEM USING NON LINEAR DETECTION

摘要

A process for computing Channel Quality Indicator (CQI) in a receiver for a spatial multiplexed Multiple Input Multiple Output (MIMO) wireless communication system, said receiver including a non linear detector, said process involving the steps of: - estimating (10) a channel matrix H at the receiver; - computing (20) H^H H; - computing (30) Cholesky factor C, with C being a triangular matrix having diagonal elements ck k and satisfying the following equation: H^HH = C^HC; - computing (40) per stream Signal-to-interference Ratio (SINR) by C12 applying the formula: (formula) with σ² being the noise variance; - computing (50) per stream channel capacity C_k by applying the formula: C_k = Iog₂(l + SINR_k); - quantizing (60) the Channel Quality Indicator (CQI) according to the computed per stream channel capacity C_k; - reporting (70) the quantized CQI to the transmitter. The process is particularly adapted to non linear detection process based on the use of a Sphere Decoder.