A Novel Detection Method for Double-ABBA Quasi-Orthogonal Space-Time Code with Low Complexity and High Performance

In this paper, a novel detection method with self-interference reduction for double-ABBA (DABBA) quasi- orthogonal space-time code (QOSTC) is proposed, which utilizes low-dimension MMSE detection and symbols expectation (or symbols from MMSE detector) feedback in open-model. The symbols´ expectations, which are derived from bit-wise soft-information (BWSI) from channel decoder, are used in self-interference reduction for low-order modulation, such as QPSK. By utilizing the expectation derived from BWSI (or symbols from MMSE detector) and equivalent space-time channel effectively, its performance, such as PER and throughput, is better than conventional MMSE detection and it´s complexity is lower, because the matrix´s dimensions in MMSE detection are lower, so the scheme is more realizable in chip architecture. And the proposed detection scheme can also be used in other QOSTC.