Multiple input/multiple output communication method based on distributed transmission sources
First Claim
1. A multiple input/multiple output (MIMO) communication method based on distributed transmission sources in a centralized base station system for transmitting a downlink data stream in a MIMO mode between M transmitting antennas and a mobile terminal within their coverage area, wherein said mobile terminal has P receiving antennas, M>
- 1 and P>
1, a first and second channels from at least two transmitting antennas of the M transmitting antennas to one of said P receiving antennas have different multipath distributions, said method comprising;
transmitting a different sub-data stream of M sub-data streams obtained by dividing said downlink data stream from said M transmitting antennas respectively to said mobile terminal by using the same spreading code;
estimating a multipath channel matrix, corresponding to P receiving antennas of the mobile terminal, of channels from said M transmitting antennas to the receiving antenna, which use the spreading code;
And processing transmitted signals corresponding to said M sub-data streams received by the receiving antenna based on said multipath channel matrix of each receiving antenna, to restore said downlink data stream, wherein said step of estimating the multipath channel matrix of each receiving antenna corresponding to the spreading code comprising;
measuring the total number of all the multipath received components, each having a different delay, of actually received transmitted signals corresponding to the spreading code; and
constructing the multipath channel matrix by taking the number of delays as the multipath number of the MIMO system, so that if the signal transmitted by one of the transmitting antennas to the receiving antenna has no multipath component corresponding to one of the delays, the channel parameter corresponding to the transmitting antenna, the receiving antenna and the delay is set as 0, and said transmitting step comprising;
adjusting the gain of said M sub-data streams based on the average signal quality measurement of uplink signals from the mobile terminal to said M transmitting antennas, so that average path losses of respective downlink channels are substantially equal.
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Abstract
A MIMO method based on distributed transmission sources for transmitting a downlink data stream between M transmitting antennas and a mobile terminal having P receiving antennas, M and P>1, channels from at least two transmitting antennas to one of receiving antennas have different multipath distributions, said method comprises transmitting corresponding M substreams to the mobile terminal by using the same spreading code; estimating the multipath channel matrix; and processing the signal according to the multipath channel matrix to restore the downlink data stream, the estimating including measuring the total number of actual multipath received components having different delays in the transmitted signals; constructing the multipath channel matrix by taking the number as the multipath number, so that if the signal transmitted by one of the transmitting antennas to the receiving antenna has no multipath component corresponding to one of the delays, the channel parameter corresponding to the transmitting antenna, the receiving antenna and the delay is set as 0, the transmitting comprises adjusting the gain of said M sub-data streams based on the average signal quality measurement of uplink signals from the mobile terminal to said M transmitting antennas, so that average path losses of respective downlink channels are substantially equal.
75 Citations
10 Claims
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1. A multiple input/multiple output (MIMO) communication method based on distributed transmission sources in a centralized base station system for transmitting a downlink data stream in a MIMO mode between M transmitting antennas and a mobile terminal within their coverage area, wherein said mobile terminal has P receiving antennas, M>
- 1 and P>
1, a first and second channels from at least two transmitting antennas of the M transmitting antennas to one of said P receiving antennas have different multipath distributions, said method comprising;
transmitting a different sub-data stream of M sub-data streams obtained by dividing said downlink data stream from said M transmitting antennas respectively to said mobile terminal by using the same spreading code;
estimating a multipath channel matrix, corresponding to P receiving antennas of the mobile terminal, of channels from said M transmitting antennas to the receiving antenna, which use the spreading code;
Andprocessing transmitted signals corresponding to said M sub-data streams received by the receiving antenna based on said multipath channel matrix of each receiving antenna, to restore said downlink data stream, wherein said step of estimating the multipath channel matrix of each receiving antenna corresponding to the spreading code comprising;
measuring the total number of all the multipath received components, each having a different delay, of actually received transmitted signals corresponding to the spreading code; and
constructing the multipath channel matrix by taking the number of delays as the multipath number of the MIMO system, so that if the signal transmitted by one of the transmitting antennas to the receiving antenna has no multipath component corresponding to one of the delays, the channel parameter corresponding to the transmitting antenna, the receiving antenna and the delay is set as 0, and said transmitting step comprising;
adjusting the gain of said M sub-data streams based on the average signal quality measurement of uplink signals from the mobile terminal to said M transmitting antennas, so that average path losses of respective downlink channels are substantially equal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
- 1 and P>
Specification