Patent ID: 8077788
Filing Date: 2011-12-13
Classification: H04B

Abstract:
1. A method comprising: providing a look-up table that comprises distance information corresponding to a distance between a potential candidate symbol and a most proximate competing symbol for each bit of a plurality of potential candidate symbols; receiving a plurality of candidate symbols that are provided in a maximum likelihood solution and correspond to a plurality of antenna layers of a multiple input multiple output (MIMO) wireless communication system; selecting a first candidate symbol from the plurality, of candidate symbols, wherein the first candidate symbol corresponds to a first potential candidate symbol of the plurality of candidate symbols; obtaining the distance information for each bit of the first potential candidate symbol from the look-up table; determining likelihood indicium for each bit of the first candidate symbol as a function of the distance information for each bit of the first potential candidate symbol, wherein the likelihood indicium for a given bit is indicative of a likelihood that a value for the given bit is a logic 1 or a logic 0; determining a product of a maximum likelihood solution vector comprising the plurality of candidate signals and an overall channel matrix; and subtracting the product from the received signal vector to determine a residual noise vector, wherein the likelihood indicium for each bit is a further function of the residual noise vector.