Wireless device and wireless communication method
AssigneeFujitsu Limited
InventorTakashi Seyama
Life of this patent
Estimating the term…
Abstract
A wireless device, including: an antenna configured to receive a reception signal, a processor configured to convert the reception signal into a first signal that includes a product of an upper triangular matrix and a transmission signal, to detect a first region, to which the first signal belongs, on an IQ plane, a memory configured to store a symbol ranking table that stores symbol candidates in an order of shorter distance from a region center, up to an order that is equal to a rank upper limit value that is set to be lower than a modulation multi-level number of the transmission signal, wherein the processor is further configured to select a first symbol candidate based on the first region and the symbol ranking table.
Claims6
A wireless device, comprising:
- N antennas configured to receive a reception signal including modulation symbols, N being a natural number that is more than 1;
- a processor configured to:
- convert the reception signal into a specified signal that includes a product of an upper triangular matrix and a transmission signal corresponding to the reception signal, and
- perform a processing of kth stage for 1≦k≦N in order, the processing of kth stage including:
- (a) detecting each of areas to which each of kth processed signals belongs on an IQ plane, each of the kth processed signals being obtained by cancelling at least one symbol candidate included in each of surviving paths of (k−1)th stage from the specified signal, and
- (b) selecting a first number of surviving paths of kth stage from surviving path candidates of kth stage, each of the surviving path candidates of kth stage being each of combinations of each of the surviving paths of (k−1)th stage and each of a second number of symbol candidates in a corresponding symbol candidate set of kth stage, each of symbol candidate sets of kth stage being specified based on each of the detected areas, the first number of surviving paths of kth stage being selected based on each of cumulative metrics of each of the surviving paths of (k−1)th stage and each of ranks of each of symbol candidates in the corresponding symbol candidate set,
- wherein the second number is less than a modulation level of the modulation symbols included in the reception signal.
A wireless communication method by a wireless device, comprising:
- receiving a reception signal including modulation symbols;
- converting the reception signal into a specified signal that includes a product of an upper triangular matrix and a transmission signal corresponding to the reception signal, and
- perform a processing of kth stage for 1<=k<=N, wherein N being a natural number that is more than 1, in order the processing of kth stage including:
- (a) detecting each of areas to which each of kth processed signals belongs on an IQ plane, each of the kth processed signals being obtained by cancelling at least one symbol candidate included in each of surviving paths of (k−1)th stage from the specified signal, and
- (b) selecting a first number of surviving paths of kth stage from surviving path candidates of kth stage, each of the surviving path candidates of kth stage being each of combinations of each of the surviving paths of (k−1)th stage and each of a second number of symbol candidates in a corresponding symbol candidate set of kth stage, each of symbol candidate sets of kth stage being specified based on each of the detected areas, the first number of surviving paths of kth stage being selected based on each of cumulative metrics of each of the surviving paths of (k−1)th stage and each of ranks of each of symbol candidates in the corresponding symbol candidate set,
- wherein the second number is less than a modulation level of the modulation symbols included in the reception signal.
Dependencies are inferred from the claim text.