Near maximum likelihood spatial multiplexing receiver
AssigneeQualcomm Technologies International, Ltd.
InventorsHong Wan, Fei Tong, Erik Lindskog
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Abstract
This invention is related to a low-complexity MIMO detector in a wireless communication system with near optimal performance. An initial symbol estimation is performed for a received symbol vector. The soft information of the received symbol vector can be more accurately calculated using every candidate symbol vector of a combined set of candidate symbol vectors, wherein the combined set is generated based on the initial estimation. By combining aspects of both the linear detection and the ML detection, the complexity of the proposed detector becomes orders of magnitude lower than that of a ML detector, but the performance is very close to that of an ML detector.
Claims18
A method for detecting transmitted data in a multiple-input multiple-output (MIMO) receiver, the method comprising:
- estimating, by an initial symbol estimation circuit, an initial symbol for each symbol of a transmitted symbol vector based on a corresponding received symbol vector;
- generating, by a candidate symbol set generation circuit, a candidate symbol set for each estimated initial symbol of the transmitted symbol vector;
- generating a combined set of candidate symbol vectors based, at least in part, on a union of candidate symbol sets corresponding to the estimated initial symbols and symbols determined by a zero-forcing decision feedback equalizer;
- and
- determining transmitted data bits of the transmitted symbol vector using the combined set of candidate symbol vectors.
A multiple-input multiple-output (MIMO) detection apparatus for a wireless communication receiver, comprising:
- an estimation circuit configured to perform initial symbol estimation for each symbol of a transmitted symbol vector based, at least in part, on a corresponding received symbol vector;
- a candidate symbol set circuit configured to generate a candidate symbol set for each initially estimated symbol of the transmitted symbol vector, wherein a number of candidate symbols is included in each candidate symbol set,
- a plurality of decision feedback equalizers (DFEs) configured to generate a combined candidate set of candidate symbol vectors, wherein each DFE uses a respective candidate symbol in the candidate symbol set, and
- a likelihood calculator configured to determine transmitted bits of the transmitted symbol vector using the combined candidate set of candidate symbol vectors.
Dependencies are inferred from the claim text.