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, the received multiple input/multiple output signal having been transmitted by a transmitter over multiple spatial streams through a transmission channel, the method comprising:
receiving a first signal on a first spatial stream and receiving a second signal on a second spatial stream, wherein the first signal is associated with one or more first data values, and wherein the second signal is associated with one or more second data values; determining a distance value between the received second signal and each possible second data value, the determining for each of the possible second data values including:
calculating a first coordinate value that identifies coordinates for a hypothetical first signal according to a first one of the possible second data value;quantizing the first coordinate value to a nearest constellation point;repeating the calculating step and quantizing step for each of the possible second data values to generate a plurality of constellation points, one constellation point being associated with each of the possible second data values;determining the distance value between the received second signal and each of the possible second data values using the calculated constellation point associated with the possible second data value being considered, one distance value being associated with each of the possible second data values; and determining a log-likelihood ratio based on the determined distance value associated with each of the possible second data values.