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Massive connectivity is one of the main requirements of the fifth generation (5G) multiple access, and sparse code multiple access (SCMA) as a new non-orthogonal multiple access technique in frequency domain will probably meet the requirement. The sparsity of codewords is the key feature of SCMA, which can enable codewords to be overloaded. In this paper, we evaluate the performance of overloading...
Joint energy saving resource allocation and user scheduling scheme in orthogonal frequency division multiple access (OFDMA) relay networks is considered. Different from allocating resources for users, we allocate resources for packets in the priority queue. Before resource allocation, a scheduling scheme is carried out to assign different priorities to the packets in the queue to guarantee the fairness...
Network coding is significantly able to save system resources for wireless networks, and has been widely studied for the 802.11 wireless local area network and traditional cellular networks. The relay technology was introduced in 802.16j, 802.16m, and Long Term Evolution-Advanced (LTE-A) standards. Recently, the application of network coding to multi-hop wireless relay networks has been taken into...
Orthogonal frequency division multiple access (OFDMA)-based multi-hop cellular networks, benefited from the relay and OFDM technologies, have a lot of advantages over traditional wireless cellular networks including better network coverage via relay station (RS), the flexibility and adaptation in radio resource allocation. In this paper, the radio resource allocation for wireless relay links in OFDMA-based...
Being a new feature of next generation of wireless networks, MMR (mobile multi-hop relay) is proposed for the purpose of coverage extension and throughput enhancement in IMT-Advanced, IEEE 802.16j/m. Besides, with the help of relay, the system energy consumption could be well saved. In this paper, an energy saving scheduling scheme is proposed for OFDMA based two-hop relay systems. The novel scheme...
Motivated by the advantages of relaying, multi-hop relay (MR) architecture has been considered in the IEEE 802.16 networks, where the relay stations (RSs) were introduced into the conventional cellular networks to exploiting spatial reuse and to combating the shadowing at high radio frequency. In the current MR networks, the communication path has not been optimized, especially for two SSs attached...
For the next generation wireless communication systems, inter-cell interference (ICI) is the primary cause of performance degradation in cell edge mobile stations of OFDMA multi-hop cellular networks with the frequency reuse pattern (1, 3, 1). This paper introduces a new fractional frequency reuse scheme to assign radio resources in OFDMA multi-hop networks to reduce inter-cell interference and maintain...
In this paper, an Administrable Shortcut Transmission (AST) scheme in two-hop relay networks which enables two Subscriber Stations (SSs) within the same Relay Station (RS) communicate directly via RS's forwarding has been investigated. The scenario of AST scheme in two-hop relay networks and a path selection algorithm based on the minimum slot number with AST scheme are put forward. The simulation...
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