![]() ; Lei, Lei ![]() in IEEE Transactions on Green Communications and Networking (2018) Detailed reference viewed: 171 (21 UL)![]() ; Lei, Lei ![]() in 2017 IEEE Global Communications Conference (GLOBECOM) (2017, December) Non-orthogonal multiple access (NOMA) allows multiple users to simultaneously access the same time-frequency resource by using superposition coding and successive interference cancellation (SIC). Thus far ... [more ▼] Non-orthogonal multiple access (NOMA) allows multiple users to simultaneously access the same time-frequency resource by using superposition coding and successive interference cancellation (SIC). Thus far, most papers on NOMA have focused on performance gain for one or sometimes two base stations. In this paper, we study multi-cell NOMA and provide a general framework for user clustering and power allocation, taking into account inter-cell interference, for optimizing resource allocation of NOMA in multi-cell networks of arbitrary topology. We provide a series of theoretical analysis, to algorithmically enable optimization approaches. The resulting algorithmic notion is very general. Namely, we prove that for any performance metric that monotonically increases in the cells’ resource consumption, we have convergence guarantee for global optimum. We apply the framework with its algorithmic concept to a multi-cell scenario to demonstrate the gain of NOMA in achieving significantly higher efficiency. [less ▲] Detailed reference viewed: 232 (23 UL)![]() Lei, Lei ![]() in IEEE International Symposium on Wireless Communication Systems (ISWCS), Bologna, Aug. 2017 (2017, August 31) Detailed reference viewed: 322 (17 UL)![]() Lagunas, Eva ![]() ![]() ![]() in International Conference on Telecommunications and Signal Processing (TSP), Barcelona, Spain, July 2017 (2017, July) Detailed reference viewed: 231 (25 UL)![]() ; Lei, Lei ![]() in IEEE Access (2017) Detailed reference viewed: 154 (8 UL)![]() Lagunas, Eva ![]() ![]() ![]() in ICC Workshop on Satellite Communications: Challenges and Integration in the 5G ecosystem, Paris, France, May 2017 (2017, May) Detailed reference viewed: 255 (23 UL)![]() ; ; Lei, Lei ![]() in IEEE Wireless Communications and Networking Conference (WCNC), 2017 (2017, March 19) This paper investigates a power allocation problem for maximizing energy efficiency (EE) in downlink Coordinated Multi-Point (CoMP) systems with non-orthogonal multiple access (NOMA). First, users’ ... [more ▼] This paper investigates a power allocation problem for maximizing energy efficiency (EE) in downlink Coordinated Multi-Point (CoMP) systems with non-orthogonal multiple access (NOMA). First, users’ achievable data rate and network throughput are analysed under three transmission schemes: 1) all users’ signals are jointly transmitted by coordinated base stations (BSs); 2) only cell-edge users’ signals are jointly transmitted by coordinated BSs; 3) each user’s signals are transmitted by only one BS. Next, we formulate EE maximization problems for the three schemes under the constraints of minimum users’ data rate and maximum BS transmit power. The considered problem is non-convex and hard to tackle. To address it, an iterative sub-optimal algorithm is proposed by adopting fractional programming and difference of convex programming. Numerical results show that the near optimality performance of EE can be achieved by using the proposed algorithm with advantages of fast convergence and low complexity. Three transmission schemes of NOMA have superior EE performance compared with conventional orthogonal multiple access scheme in the same CoMP networks. [less ▲] Detailed reference viewed: 276 (32 UL)![]() Lei, Lei ![]() ![]() ![]() in International Workshop on Signal Processing Advances in Wireless Communications (SPAWC), Sapporo, Japan, July 2017 (2017) Detailed reference viewed: 217 (10 UL) |
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