Patent ID: 7532599
Filing Date: 2009-05-12
Classification: H04L

Abstract:
1. A method of allocating a terminal in a spatial multiplexing multi-input multi-output (SM-MIMO) system, the method comprising the steps of: calculating, by each of a plurality of terminals, an effective signal-to-interference noise ratio (SINR) of each of a plurality of channels over each of a plurality of possible detection orders; selecting, by each of the terminals, a detection order that minimizes a highest of error probabilities of the channels from among the detection orders, wherein each of the error probabilities is based on a product of a minimum symbol distance of a modulation scheme to be used in one of the channels and the effective SINR of the one of the channels; transmitting, by each of the terminals, to a base station, the selected detection order and modulation schemes to be used in the channels in accordance with the selected detection order; selecting, by the base station, a terminal with a lowest average of the error probabilities from among the terminals using detection orders received from the terminals; and setting, by the base station, the modulation schemes to be used in the channels, according to the detection order corresponding to the selected terminal, wherein the detection order selecting step comprises selecting the detection order by where i is the index of the detection order, k is the index of a transmit antenna, g M is a constant being the minimum symbol distance of the modulation scheme, γ is a signal-to-interference ratio (SIR) of the one of the channels, and r is a number of the channels with non-zero bits.