A Low-Complexity Detector for Uplink SCMA by Exploiting Dynamical Superior User Removal Algorithm

A Low Complexity Detection Algorithm for SCMA

Sparse code multiple access (SCMA) is a new multiple access technique which supports massive connectivity. Compared with the current Long Term Evolution (LTE) system, it enables the overloading of active users on limited orthogonal resources and thus meets the requirement of the fifth generation (5G) wireless networks. However, the computation complexity of existing detection algorithms increas...

A low complexity detector for downlink SCMA systems

Sparse Code Multiple Access (SCMA) is a novel non-orthogonal multiple access scheme for 5G systems, in which the logarithm domain message passing algorithm (Log-MPA) is applied at the receiver to achieve near-optimum performance. However, the computational complexity of Log-MPA detector is still a big challenge for practical implementation, especially for energysensitive user equipments in the ...

A Complexity-Reduced Active MS Antenna Selection Algorithm for Uplink Multi-user MIMO/SDM Systems

Near optimum low complexity MMSE multi-user detector

In this paper we propose a novel multiuser detector for the synchronous CDMA system. Its BER performance approaches to the optimum MMSE multiuser detector while the complexity only polynomially increases to the number of active users. We also demonstrate its complexity and performance over optimnm MMSE multiuser detector and decorrelator. In addition to synchronous AWGN channel case, we also pr...

A low complexity transmitter structure for OFDM-FDMA uplink systems

The orthogonal frequency division multiplex (OFDM) transmission technique can efficiently deal with the effects of multi-path propagation in the broadband radio channel. It also has a high system inherent flexibility for designing a multiple access scheme by combining the conventional TDMA, FDMA and CDMA approaches with the OFDM modulation scheme. The FDMA multiple access scheme is especially i...