Rate selection for a multi-carrier MIMO system
First Claim
1. A method of selecting a rate for data transmission in a multi-carrier multiple-input multiple-output (MIMO) communication system, comprising:
- determining an average constrained spectral efficiency for a plurality of subbands of a plurality of spatial channels used for data transmission, the plurality of spatial channels being formed by a MIMO channel in the system;
determining an equivalent signal-to-noise-and-interference ratio (SNR) needed by an equivalent system with an additive white Gaussian noise (AWGN) channel to support the average constrained spectral efficiency; and
selecting the rate for data transmission in the multi-carrier MIMO system based on the equivalent SNR.
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Abstract
To select a rate for data transmission in a multi-carrier MIMO system with a multipath MIMO channel, a post-detection SNR SNRl(k) for each subband k of each spatial channel l is initially determined and used to derive a constrained spectral efficiency Sl(k) based on a constrained spectral efficiency function fsiso(SNRl(k), M) of SNR and modulation scheme M. An average constrained spectral efficiency Savg for all subbands of all spatial channels used for data transmission is next determined based on the constrained spectral efficiencies for the individual subbands/spatial channels. An equivalent SNR needed by an equivalent system with an AWGN channel to support a data rate of Savg is determined based on an inverse constrained spectral efficiency function fsiso−1(Savg, M). A rate is selected for the multi-carrier MIMO system based on the equivalent SNR. The selected rate is the highest rate among all supported rates with a required SNR less than or equal to the equivalent SNR.
167 Citations
29 Claims
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1. A method of selecting a rate for data transmission in a multi-carrier multiple-input multiple-output (MIMO) communication system, comprising:
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determining an average constrained spectral efficiency for a plurality of subbands of a plurality of spatial channels used for data transmission, the plurality of spatial channels being formed by a MIMO channel in the system; determining an equivalent signal-to-noise-and-interference ratio (SNR) needed by an equivalent system with an additive white Gaussian noise (AWGN) channel to support the average constrained spectral efficiency; and selecting the rate for data transmission in the multi-carrier MIMO system based on the equivalent SNR. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. An apparatus in a multi-carrier multiple-input multiple-output (MIMO) communication system, comprising:
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a channel estimator operative to obtain channel estimates for a MIMO channel in the system; and a controller operative to determine an average constrained spectral efficiency for a plurality of subbands of a plurality of spatial channels used for data transmission based on the channel estimates, wherein the plurality of spatial channels are formed by the MIMO channel, determine an equivalent signal-to-noise-and-interference ratio (SNR) needed by an equivalent system with an additive white Gaussian noise (AWGN) channel to support the average constrained spectral efficiency, and select a rate for data transmission in the multi-carrier MIMO system based on the equivalent SNR. - View Dependent Claims (18, 19, 20, 21, 22, 23)
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24. An apparatus in a multi-carrier multiple-input multiple-output (MIMO) communication system, comprising:
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means for determining an average constrained spectral efficiency for a plurality of subbands of a plurality of spatial channels used for data transmission, the plurality of spatial channels being formed by a MIMO channel in the system; means for determining an equivalent signal-to-noise-and-interference ratio (SNR) needed by an equivalent system with an additive white Gaussian noise (AWGN) channel to support the average constrained spectral efficiency; and means for selecting a rate for data transmission in the multi-carrier MIMO system based on the equivalent SNR. - View Dependent Claims (25, 26, 27)
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28. A processor readable media for storing software codes operable in an apparatus to:
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determine an average constrained spectral efficiency for a plurality of subbands of a plurality of spatial channels used for data transmission in a multi-carrier multiple-input multiple-output (MIMO) communication system, the plurality of spatial channels being formed by a MIMO channel in the system; determine an equivalent signal-to-noise-and-interference ratio (SNR) needed by an equivalent system with an additive white Gaussian noise (AWGN) channel to support the average constrained spectral efficiency; and select a rate for data transmission in the multi-carrier MIMO system based on the equivalent SNR. - View Dependent Claims (29)
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Specification