Selecting modulation and coding level and spatial rate for orthogonal frequency domain modulation systems
First Claim
1. A method of optimizing transmission performance in a wireless multiple-input/multiple output (MIMO) system, comprising:
- determining a type of receiver for each possible transmission scheme of the MIMO system;
selecting a transmission rate from a selection of at least two transmission rates based on at least a first transmission scheme and a second transmission scheme in the MIMO system;
within the selected transmission rate, selecting a modulation and coding level, the selected modulation and coding level dictating a minimum probability of data transmission error in the system using the selected transmission rate, wherein the selected transmission rate and selected modulation and coding scheme transmit data within the MIMO system at a rate substantially equal to the broadband signaling capacity of the MIMO system.
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Abstract
Embodiments are directed to a link adaptation method that selects the optimum transmission scheme and modulation and coding signal (MCS) level within a MIMO system, based on optimal maximum throughput on the channels. The method selects the MCS levels and spatial rate values for broadband communication systems based on the instantaneous broadband MIMO-OFDM signaling capacities. The transmission rate over the transmission channel is selected based on a comparison of the capacities achieved under diversity coding and spatial multiplexing MIMO transmission schemes. The effect of a particular receiver type or implementation can also be factored into the signaling capacity. For a fixed target probability of error, the scheme or spatial rate that has the higher instantaneous throughput is selected for transmission.
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Citations
20 Claims
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1. A method of optimizing transmission performance in a wireless multiple-input/multiple output (MIMO) system, comprising:
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determining a type of receiver for each possible transmission scheme of the MIMO system;
selecting a transmission rate from a selection of at least two transmission rates based on at least a first transmission scheme and a second transmission scheme in the MIMO system;
within the selected transmission rate, selecting a modulation and coding level, the selected modulation and coding level dictating a minimum probability of data transmission error in the system using the selected transmission rate, wherein the selected transmission rate and selected modulation and coding scheme transmit data within the MIMO system at a rate substantially equal to the broadband signaling capacity of the MIMO system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of selecting operating characteristics of a multiple input/multiple output (MIMO) system, comprising:
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approximating a signaling capacity of a given channel for at least two possible transmission rates of the MIMO system;
equating the approximated signaling capacity of the given channel to an effective capacity of an Additive White Gaussian Noise (AWGN) channel;
determining an effective signal-to-noise ratio which, over the AWGN channel, provides the same signaling capacity over the given channel;
comparing the effective signal-to-noise ratio for each transmission rate of the at least two possible transmission rates with the other transmission rates of the at least two possible transmission; and
selecting the transmission rate with the highest effective signal-to-noise ratio as the transmission scheme for communication over the MIMO system. - View Dependent Claims (13, 14, 15, 16)
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17. A system comprising:
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a multiple input/multiple output (MIMO) base station;
a MIMO receiver coupled to the base station over a MIMO-OFDM wireless link, the MIMO receiver executing a process configured to;
select a transmission rate from a selection of at least two transmission rates based on at least a first transmission scheme and a second transmission scheme in the system, and select a modulation and coding level within the selected transmission rate, the selected modulation and coding level dictating a minimum probability of data transmission error in the system using the selected transmission rate, wherein the selected transmission rate and selected modulation and coding scheme transmit data within the system at a rate substantially equal to the broadband signaling capacity of the system. - View Dependent Claims (18, 19, 20)
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Specification