Wireless communication system and receiving device
First Claim
1. A wireless communication system in which a transmitting device having a plurality of transmitting antennas and a receiving device having a plurality of receiving antennas communicate in an orthogonal frequency division multiplexing system,said transmitting device comprising:
- a status acquiring unit acquiring a channel matrix generated by previous signals from said receiving device;
a partition unit partitioning a transmission data sequence into a plurality of data streams; and
a mapping unit mapping each of the plurality of data streams to each of the plurality of transmitting antennas by using, for a precoding matrix, columns, corresponding to a stream count of the plurality of data streams, of a right singular matrix acquired by singular value decomposition of the channel matrix, andsaid receiving device comprising;
an estimation unit estimating a present channel status from received signals and generating a present channel matrix representing the present channel status; and
a decoding unit Viterbi-decoding the received signals by weighting a path metric by using a weighting coefficient corresponding to a signal-to-noise ratio obtained from the present channel matrix.
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Abstract
The present invention is to provide a wireless communication system and a receiving device each capable of restraining a circuit scale and obtaining an excellent error rate performance. In a wireless communication system in which a transmitting device and a receiving device communicate in an orthogonal frequency division multiplexing system, the transmitting device includes a partition unit partitioning a transmission data sequence into a plurality of data streams and a mapping unit mapping the plurality of data streams to each of transmitting antennas by using, for a precoding matrix, columns, corresponding to a stream count of the plurality of data streams, of a right singular matrix acquired by singular value decomposition of a channel matrix, and the receiving device includes a decoding unit that Viterbi-decodes the received signals by weighting a path metric by using a weighting coefficient corresponding to a signal-to-noise ratio obtained from the present channel matrix.
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Citations
10 Claims
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1. A wireless communication system in which a transmitting device having a plurality of transmitting antennas and a receiving device having a plurality of receiving antennas communicate in an orthogonal frequency division multiplexing system,
said transmitting device comprising: -
a status acquiring unit acquiring a channel matrix generated by previous signals from said receiving device; a partition unit partitioning a transmission data sequence into a plurality of data streams; and a mapping unit mapping each of the plurality of data streams to each of the plurality of transmitting antennas by using, for a precoding matrix, columns, corresponding to a stream count of the plurality of data streams, of a right singular matrix acquired by singular value decomposition of the channel matrix, and said receiving device comprising; an estimation unit estimating a present channel status from received signals and generating a present channel matrix representing the present channel status; and a decoding unit Viterbi-decoding the received signals by weighting a path metric by using a weighting coefficient corresponding to a signal-to-noise ratio obtained from the present channel matrix. - View Dependent Claims (2, 3, 4, 5)
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6. A receiving device communicating with a transmitting device partitioning a transmission data sequence into a plurality of data streams and transmitting the plurality of data streams by mapping to a plurality of transmitting antennas in an orthogonal frequency division multiplexing system, comprising:
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an estimation unit estimating a present channel status from received signals and generating a present channel matrix representing the present channel status; and a decoding unit Viterbi-decoding the received signals by weighting a path metric by using a weighting coefficient corresponding to a signal-to-noise ratio obtained from the present channel matrix. - View Dependent Claims (7, 8, 9, 10)
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Specification