Low complexity technique for log-likelihood ratio computation

摘要

Systems and methods for detecting data in a multiple input/multiple output signal. The method includes receiving a first signal associated with a first data value and a second signal associated with a second data value. A distance value between the received second signal and each possible second data value is calculated. Coordinates for a hypothetical first signal in light of a first possible second data value are calculated, and the first coordinate value is quantized to a nearest constellation point. A distance value between the received second signal and each possible second data value is calculated using the calculated constellation points. A determination is made of a log-likelihood ratio based on the determined distance values.

主权项

1. A method of detecting data in a received multiple input/multiple output signal that is transmitted by a transmitter over multiple spatial streams through a transmission channel, the method comprising:
receiving, on a first spatial stream, a first signal that is associated with one or more first data values; receiving a channel matrix representing combined effects of (i) the transmission channel and (ii) a spatial mapping of the transmitter on a transmitted signal; permutating columns of the channel matrix; determining a distance value between the received first signal and each of the possible first data values, by
calculating a second coordinate value that identifies coordinates for a hypothetical second signal according to each of the possible first data values,quantizing the second coordinate value to a nearest second constellation point,repeating the calculating and the quantizing for each of the possible first data values to generate a plurality of second constellation points, one second constellation point being associated with each of the possible first data values, anddetermining the distance value between the received first signal and each of the possible first data values using elements of (i) the permutated columns of the channel matrix and (ii) the second constellation point associated with the possible first data value being considered, wherein one distance value is associated with each of the possible first data values.