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AssigneeSiemens Aktiengesellschaft
InventorsThomas Haustein, Eduard Jorswieck, Volker Jungnickel, Udo Krueger, Volker Pohl, Clemens v. Helmolt, Gerhard Wunder
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The invention relates to a signal processing method which optimizes the bit error rate under pragmatic conditions. The signalling method is optimally matched to the radio channel, variable with time, in rapid sequence by means of linear operations. Uplink and downplink transmission sides are determined by an excess of antennae on the downplink transmission side. The estimations of the channel matrix in the one transmission direction, necessary for the matching of the transmitter, can, in the absence of common-channel distortions with the condition of channel reciprocity, be directly obtained from the estimations for the other transmission direction. By means of a suitable linear combination of the transmission signals and, optionally, also the received signals, an error-free bi-directional transmission of data streams can be achieved in Rayleigh and Rice channels with significantly lower transmission powers than in purely receiver-side linear signal processing.
An adaptive signal processing method for a bidirectional wireless transmission of digital data streams in uplink and downlink transmission directions over a MIMO channel with n antennae at one an m antennae at the other side of the channel and with transmission-side signal preprocessing of the transmission signals x and receiving-side signal postprocessing of the received signals y, both being based upon an estimation of the complex-valued channel matrix, whereby
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