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Non-orthogonal multiple access (NOMA), which improves spectrum efficiency and system throughput, is one of the promising radio access techniques for 5G. In this paper, NOMA is combined with spatial multiplexing multiple-input multiple-output (MIMO) technology for enhanced spectral efficiency. In multi-stream MIMO signaling, we considered stronger far user's MIMO signal when detecting the near user's...
Iterative tree search algorithms like K-Best or sphere decoder algorithms are promising candidates for the upcoming wireless communications systems. In this paper a square root and division free Givens rotation (SDFG) algorithm is merged into a common sphere decoder algorithm to decrease the entire complexity. Furthermore, the algorithm is speeded up due to parallelizing the computation by taking...
In recent literature, an increasing radii algorithm (IRA) is introduced to decode the signals in multiple-input multiple-output (MIMO) systems. It is developed from the idea of sphere decoder (SD) and can achieve near-maximum likelihood (ML) decoding performance with relatively lower complexity than the SD by taking the noise statistics into consideration. In this paper, an improved IRA (IIRA) is...
In this paper, we propose a multiple phase decoder (MPD) for MIMO communication systems with M-PSK signals. The proposed decoder is based on a phase descent search (PDS) algorithm. The PDS algorithm is based on coordinate descent iterations and constraints elements of the solution to have unit magnitudes. In the MPD, the PDS algorithm is used multiple times with different initializations. The solution...
In this work, we are interested in the decoding of MIMO systems by using sequential decoders. These ones consist on tree search algorithms and were originally used to decode binary codes. They were rediscovered and adapted to MIMO systems by Murugan and al. We are interested here in the stack decoder. We propose a new sequential decoder that we call the spherical-bound stack decoder (SB-Stack) combining...
Soft iterative detection and decoding techniques have been shown to be able to achieve near-capacity performance in multiple antenna systems. To obtain the optimal soft information by marginalizing over the entire observation space is intractable; and it is not clear what the best way to obtain the suboptimal soft information is. In this talk, an improved scheme is proposed which can be adapted to...
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