| 摘要 |
RAKE-based receivers utilize lattice reduction for improving symbol estimation accuracy. Channel response estimates and received signal streams are transformed from a constellation lattice basis to an integer lattice basis to increase the orthogonality of symbol estimation decision regions. In one embodiment, received signal streams are processed by generating despread signal samples from received signal streams transmitted using different spreading codes (200). Channel response associated with the different received signal streams is estimated (204) and transformed from a first lattice basis to a second lattice basis having greater orthogonality between decision regions than the first lattice basis (206). The despread signal samples are aligned to the second lattice (202) and combining weights generated based on the transformed channel response estimate (208). Symbol estimation decision statistics are generated based on the combining weights and the aligned despread signal samples (210). Soft bit values are generated for decoding based on the symbol estimation decision statistics (212). |
