In this paper, we propose a novel location-based operation strategy for Device-to-Device (D2D) communication which exploits successive interference cancellation (SIC). First, we investigate the characteristics of SIC-enabled D2D, and then propose a new resource selection scheme to fully exploit cellular uplink (UL) resources and downlink (DL) resources using only location information. Second, we propose a new power allocation scheme designed to overcome the problem of excess outages in cellular users. Simulation results show that the proposed schemes show good D2D throughput performance compared to the existing schemes, while guaranteeing reliability for cellular users.

This paper proposes a new multi-user detection scheme for sparse code multiple access (SCMA) system in grant- free scenario. SCMA systems use a message passing algorithm which considers all user equipments (UEs) to be active. However, in a practical system, UEs do not always request resources. A multi-user detection procedure enables the decoder to mitigate interference from proper active UEs and to ignore the signal from inactive UEs. Therefore, we propose a multi-user detection scheme for SCMA system. The simulation results present that the proposed SCMA receiver structure achieves a remarkable enhancement in false alarm probability, miss detection probability.

Full-duplex (FD) systems ideally double the system capacity compared to conventional half-duplex (HD) systems. However, we can obtain that goal only when FD systems always have both downlink (DL) and uplink (UL) traffic loads. This paper sheds new light on whether FD can achieve this promising performance enhancement in more realistic traffic settings. We first provide the sum capacity of the FD system when DL and UL traffic loads are different. In addition, we define the FD gain according to traffic loads and compare FD performance with the HD system which is based on time-division duplex (TDD). We then analyze the effect of traffic loads and residual self- interference (SI) on the FD system. Simulation results and analysis reveal that FD performance decreases in a limited traffic setting.

A procedure is presented for simplifying the flow table of a sequential machine M when, in addition to the given flow table, it is specified that certain input sequences cannot occur. It is assumed that M receives its input from the output of another machine M, and that the restricted sequences are therefore those sequences that M, cannot generate.