Iterative detection in MIMO systems
AssigneeTexas Instruments Incorporated
InventorsEko N. Onggosanusi, Anand G. Dabak
Life of this patent
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Abstract
Detection for a MIMO (multiple-input, multiple-output) wireless communications system with symbols iteratively detected in subsets with maximum likelihood hard decisions within subsets. Previously detected subsets of symbols are used to regenerate corresronding input signals for interference cancellation. With a 4-transmitter antenna, 4-receiver antenna system, two subsets of two symbols are possible with the first two symbols detected with zero-forcing or MMSE soft estimates which feed maximum likelihood hard decisions; and the hard decision for the first two symbols are used for interference cancellation followed by zero-forcing or MMSE soft estimates for the second two symbols which then feed further maximum likelihood hard decisions.
Claims11
A method of detection in a multiple-input, multiple-output wireless communication system, comprising the steps of:
- (a) receiving a signal representing a set of P symbols, one symbol transmitted from each of P antennas where P is a positive integer greater than 2;
- (b) jointly estimating a subset of P1 symbols of said set of P symbols where P1 is a positive integer;
- (c) after step (b), jointly estimating a subset of P2 symbols of said set of P symbols where P2 is a positive integer and wherein said subset of P1 symbols and said subset of P2 symbols are members of a partition of said set of P symbols and P1+P2 is greater than 2 and wherein P1=P2=P/2 when there are 2 antennas.
Dependencies are inferred from the claim text.