The Alamouti transmit diversity scheme assumes that the channel remain constant during the length of the code word period. However, in time selective channel, this assumption does not hold good and leads to inter transmit antenna interferences (ITAI). To combat the ITAI effects, we have analyzed various conventional signal detection methods which include diagonalized maximum likelihood (DML), QR decomposition based maximum likelihood (QRD-ML) and ML. But the QRD-ML method suffers from error floor if the initial signal is not detected correctly and it also has high computational complexity due to the implementation of ML method. Hence, in this paper, we have proposed a low complexity order QRD (OQRD) method which eliminates the error floor by detecting and cancelling the strongest signal before the detection of weakest signal. To further improve the system performance, we have cascaded the OQRD method with parallel interference cancellation (PIC). Simulation results show that our proposed OQRD and OQRD-PIC methods achieve performance close to the optimal ML method.
Combined Order QRD with PIC Based Signal Detection Method for High Mobility STBC System
01.06.2017
284842 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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