Apparatus and method for decoding a received signal

摘要

An apparatus for decoding a received signal is provided. The received signal has been transmitted by conducting a transmission. The apparatus for decoding includes a detector and a filter application unit. The detector is configured to detect whether the transmission is a SU-MIMO transmission or a MU-MIMO transmission. The filter application unit is configured to apply either a first receive filter or a second different receive filter on the received signal depending on whether the transmission is the SU-MIMO transmission or the MU-MIMO transmission.

主权项

1. An apparatus for filtering a received signal to obtain a filtered signal, wherein the received signal has been transmitted by conducting a transmission, wherein the apparatus comprises:
a detector configured to detect whether the transmission is either a single-user Multiple Input Multiple Output transmission or a multi-user Multiple Input Multiple Output transmission, and a filter application unit, wherein the filter application unit is configured to apply a first receive filter with a first filter characteristic on the received signal to obtain the filtered signal when the transmission is the single-user Multiple Input Multiple Output transmission, and wherein the filter application unit is configured to apply a second receive filter with a second, different filter characteristic on the received signal to obtain the filtered signal when the transmission is the multi-user Multiple Input Multiple Output transmission, wherein the detector is configured to determine whether a ratio of a maximum of main-diagonal coefficients of an interference-plus-noise covariance matrix and an average noise power is greater than one to determine whether the transmission is the multi-user Multiple Input Multiple Output transmission or the single-user Multiple Input Multiple Output transmission, wherein the filter application unit is configured to apply a Minimum-Mean-Square-Error receive filter as the second receive filter on the received signal when the transmission is the multi-user Multiple Input Multiple Output transmission, the Minimum-Mean-Square-Error receive filter being defined according tom_MMSEH=g_1H⁢R_ηη_-1g_1H⁢R_ηη-1⁢g_1 as the second receive filter on the received signal when the transmission is the multi-user Multiple Input Multiple Output transmission, wherein g1 denotes a matrix-vector product H1pi, wherein H1 denotes the channel from an eNodeB to a user equipment, wherein pi denotes a precoding vector recommended by the user equipment, wherein g1H denotes a Hermitian of the matrix-vector product g1, and wherein Rηη−1 denotes an inverse matrix of a covariance matrix Rηη.