Abstract
This paper investigates the non-orthogonal multiple access (NOMA) based multicasting in wireless caching networks for the performance enhancement of spectral efficiency. Particularly, at the base stations (BSs), upon receiving the requests from the attached user equipments (UEs), a superposed message of the most requested m files is broadcasted by applying NOMA to simultaneously satisfy the demands of multiple UEs, with the power allocation of the files determined by the respective number of requests. Further, at the UEs, two different decoding strategies, i.e., the conventional SIC without cache-aided interference cancellation and the SIC with cache-aided interference cancellation, are considered to facilitate the reliable data reception. To analyze the performance of the proposed NOMA based multicasting scheme, a novel framework is developed based on stochastic geometry. We first derive the probability that an ordered sequence eΨ Y of m files is broadcasted by the typical BS Y with the technique of NOMA. Then, we characterize the coverage probability of i-th file in eΨ Y . Further, we evaluate the average coverage probability of the wireless caching network with the studied NOMA based multicasting. It is shown by simulations that the derived analytical results are validated and the technique of wireless caching can further improve the performance of NOMA.
Highlights
Non-orthogonal multiple access (NOMA) has been identified as one of the key enabling technologies of the fifth generation (5G) communication systems to enhance the spectral efficiency [1]
Different from the conventional orthogonal multiple access approaches, by utilizing the successive interference cancellation (SIC) technique at the receivers, NOMA can support the transmission of a mixture of multiple messages for different users on the same
To analyze the performance of the proposed NOMA based multicasting scheme, a novel framework is developed based on stochastic geometry
Summary
Non-orthogonal multiple access (NOMA) has been identified as one of the key enabling technologies of the fifth generation (5G) communication systems to enhance the spectral efficiency [1]. To enhance the overall spectral efficiency of the wireless caching network, a NOMA based multicasting scheme is proposed. The coverage probability of the i-th file in Y cannot be directly applied to derive the average coverage probability of the studied wireless caching network To address this issue, by utilizing ξq, we transfer the coverage of the i-th file in Y to the i-th file in M, and based on which evaluate the average coverage probability of the proposed NOMA based multicasting scheme. Our numerical results demonstrate the potential gain of joint utilizing the techniques of NOMA and wireless caching to enhance the performance of the wireless networks. X. Song et al.: Coverage Performance Analysis of Wireless Caching Networks With NOMA-Based Multicasting TABLE 1.
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