Methods and apparatus for MIMO detection

摘要

A transmitted signal estimate based on signals received in a layer i within a multiple input, multiple output transmission system and based upon selected constellation points for other, previously processed layers is quantized to a nearest constellation point. A list of candidates headed by the nearest constellation point and with remaining candidates presorted by proximity to the head is selected, for each such quantized estimate based on constellation point selections for previously processed layers. To select K best candidates for the transmitted signal estimates of the current layer i, the proximity of the candidates at the head of each list to the signal estimate for the current layer are compared, and the closest candidate is selected. The list containing the selected candidate is advanced, and proximity of the transmitted signal estimate to all list heads is again evaluated and the closest candidate selected.

主权项

1. A method, comprising:
in a multiple input, multiple output (MIMO) transmission system having L layers, selecting a plurality of constellation point candidates for a first layer; and for each other i-th layer of the L layers, selecting a plurality of lists of constellation point candidates with a head of each list being a transmitted signal estimate for a current layer quantized to the constellation, wherein remaining constellation point candidates within each of the lists are presorted according to proximity to the head of the respective list, wherein the transmitted signal estimate for the current layer is derived based on a corresponding set of one or more constellation point candidates for prior layers, and wherein the K candidates for the i-th layer are selected by
selecting, among the heads of the selected plurality of lists, one candidate based upon proximity to the corresponding transmitted signal estimate, andadvancing remaining candidates in the list from which the selected candidate was chosen toward the head of that list, wherein the selecting and advancing are performed iteratively until K candidates for the i-th layer have been selected, where L, i and K are integers.