基于NOMA的D2D辅助中继系统性能分析与优化
|
摘要
本文针对两阶段NOMA(Non-Orthogonal Multiple Access)-D2D(Device-to-Device)辅助中继场景提出了一种功率优化算法,推导分析了各用户的中断概率。构建了以最大化系统各态历经容量为目标的优化问题,由于一、二两阶段通信用户的差异性,重点优化了对提升系统容量起决定作用的第一阶段功率分配因子,分析证明了原优化问题存在极值点,并利用凸函数性质获得了优化的功率分配因子,并且进一步推导分析了各个用户的中断概率。仿真结果表明,理论推导的中断概率值与仿真结果完全一致,证明了推导的正确性,本文提出的功率优化算法能显著提高系统容量,且降低了中断概率。例如当SNR为35 dB时,本文算法可以提高约17.6%的系统容量,而作为辅助中继用户的中断概率大约降低了81.3%。
In this paper, a power optimization algorithm is proposed for the two-stage NOMA(Non-Orthogonal Multiple Access)-D2 D(Device-to-Device)cooperative relay scene, and the outage probability of each user is deduced and analyzed.An optimization problem aiming at maximizing the ergodic capacity of the system is constructed, due to the difference of communication users in the first and second stages, the power distribution factor in the first stage which plays a decisive role in improving system capacity is optimized. The extreme point of the original optimization problem is proved, the optimal power distribution factor is obtained by using the property of convex function, and the outage probability of each user is further deduced and analyzed. The simulation results show that the theoretical outage probability value is completely consistent with the simulation results, which proves the correctness of the derivation. The power optimization algorithm proposed in this paper can significantly improve the system capacity and reduce the outage probability. For example, when SNR is 35 dB, the algorithm in this paper can improve about 17.6% of the system capacity, while the outage probability of cooperative relay user is reduced by about 81.3%.
In this paper, a power optimization algorithm is proposed for the two-stage NOMA(Non-Orthogonal Multiple Access)-D2 D(Device-to-Device)cooperative relay scene, and the outage probability of each user is deduced and analyzed.An optimization problem aiming at maximizing the ergodic capacity of the system is constructed, due to the difference of communication users in the first and second stages, the power distribution factor in the first stage which plays a decisive role in improving system capacity is optimized. The extreme point of the original optimization problem is proved, the optimal power distribution factor is obtained by using the property of convex function, and the outage probability of each user is further deduced and analyzed. The simulation results show that the theoretical outage probability value is completely consistent with the simulation results, which proves the correctness of the derivation. The power optimization algorithm proposed in this paper can significantly improve the system capacity and reduce the outage probability. For example, when SNR is 35 dB, the algorithm in this paper can improve about 17.6% of the system capacity, while the outage probability of cooperative relay user is reduced by about 81.3%.
引文
[1] Dai Linglong, Wang Bichai, Yuan Yifei, et al. Non-Orthogonal Multiple Access for 5G: Solutions, Challenges, Opportunities, and Future Research Trends[J]. IEEE Communications Magazine, 2015, 53(9): 74- 81.
[2] Saito Y, Kishiyama Y, Benjebbour A, et al. Non-Orthogonal Multiple Access(NOMA) for Cellular Future Radio Access[C]//IEEE 77th Vehicular Technology Conference. IEEE, 2013: 1-5.
[3] Li Anxin, Yang Lan, Chen Xianhang, et al. Non-Orthogonal Multiple Access(NOMA) for Future Downlink Radio Access of 5G[C]//China Communications, 2015: 28-37.
[4] Zhang Yi, Wang Huiming, Zheng Tongxing, et al. Energy-Efficient Transmission Design in Non-orthogonal Multiple Access[J]. IEEE Transactions on Vehicular Technology, 2017, 66(3): 2852-2857.
[5] Yang Zhaohui, Xu Wei, Pan Cunhua, et al. On the Optimality of Power Allocation for NOMA Downlinks with Individual QoS Constraints[J]. IEEE Communication Letters, 2017, 21(7): 1649-1652.
[6] 王歌,赵知劲. NOMA系统中利用共轭梯度法的功率分配方案[J]. 信号处理, 2018, 34(9): 1124-1129.Wang Ge, Zhao Zhijin. A Power Allocation Scheme Based on Conjugate Gradient Method in NOMA System[J]. Journal of Signal Processing, 2018, 34(9): 1124-1129.(in Chinese)
[7] Timotheou S, Krikidis I. Fairness for Non-Orthogonal Multiple Access in 5G Systems[J]. IEEE Signal Processing Letters, 2015, 22(10): 1647-1651.
[8] Fang Fang, Zhang Haijun, Chen Julian, et al. Energy-Efficient Resource Scheduling for NOMA Systems With Imperfect Channel State Information[C]//IEEE ICC 2017 Mobile and Wireless Networking. IEEE, 2017: 1-5.
[9] 谭锴, 朱琦. 基于能量采集的译码转发中继系统功率分配算法[J]. 信号处理, 2017, 33(6): 887- 893.Tan Kai, Zhu Qi. The Algorithm of Power Allocation in Decode-and-Forword Relaying System with Energy Harvesting[J]. Journal of Signal Processing, 2017, 33(6): 887- 893.(in Chinese)
[10] Kim J B, Lee I H, Lee J. Capacity Scaling for D2D Aided Cooperative Relaying Systems Using NOMA[J]. IEEE Wireless Communications Letters, 2018, 7(1): 42- 45.
[11] Liu Jiaqi, Xiao Sa, Geoffrey Y L, et al. Optimal Mobile Association and Power Allocation in Device-to-Device-enable Heterogeneous Networks with Non-Orthogonal Multiple Access Protocol[C]//IEEE International Conference on Communications. IEEE, 2018:1- 6.
[12] Chen Bingcai, Chen Yu, Chen Yunfei, et al. A Novel Spectrum Sharing Scheme Assisted by Secondary NOMA Relay[J]. IEEE Wireless Communications Letters, 2018, 7(5): 732-735.
[13] Kim J B, Lee I H. Capacity Analysis of Cooperative Relaying Systems Using Non-Orthogonal Multiple Access[J]. IEEE Communications Letters, 2015, 19(11): 1949-1953.
[14] Chatzigeorgiou I. Bounds on the Lambert Function and Their Application to the Outage Analysis of User Cooperation[J]. IEEE Communications Letters, 2013, 17(8): 1505-1508.
[2] Saito Y, Kishiyama Y, Benjebbour A, et al. Non-Orthogonal Multiple Access(NOMA) for Cellular Future Radio Access[C]//IEEE 77th Vehicular Technology Conference. IEEE, 2013: 1-5.
[3] Li Anxin, Yang Lan, Chen Xianhang, et al. Non-Orthogonal Multiple Access(NOMA) for Future Downlink Radio Access of 5G[C]//China Communications, 2015: 28-37.
[4] Zhang Yi, Wang Huiming, Zheng Tongxing, et al. Energy-Efficient Transmission Design in Non-orthogonal Multiple Access[J]. IEEE Transactions on Vehicular Technology, 2017, 66(3): 2852-2857.
[5] Yang Zhaohui, Xu Wei, Pan Cunhua, et al. On the Optimality of Power Allocation for NOMA Downlinks with Individual QoS Constraints[J]. IEEE Communication Letters, 2017, 21(7): 1649-1652.
[6] 王歌,赵知劲. NOMA系统中利用共轭梯度法的功率分配方案[J]. 信号处理, 2018, 34(9): 1124-1129.Wang Ge, Zhao Zhijin. A Power Allocation Scheme Based on Conjugate Gradient Method in NOMA System[J]. Journal of Signal Processing, 2018, 34(9): 1124-1129.(in Chinese)
[7] Timotheou S, Krikidis I. Fairness for Non-Orthogonal Multiple Access in 5G Systems[J]. IEEE Signal Processing Letters, 2015, 22(10): 1647-1651.
[8] Fang Fang, Zhang Haijun, Chen Julian, et al. Energy-Efficient Resource Scheduling for NOMA Systems With Imperfect Channel State Information[C]//IEEE ICC 2017 Mobile and Wireless Networking. IEEE, 2017: 1-5.
[9] 谭锴, 朱琦. 基于能量采集的译码转发中继系统功率分配算法[J]. 信号处理, 2017, 33(6): 887- 893.Tan Kai, Zhu Qi. The Algorithm of Power Allocation in Decode-and-Forword Relaying System with Energy Harvesting[J]. Journal of Signal Processing, 2017, 33(6): 887- 893.(in Chinese)
[10] Kim J B, Lee I H, Lee J. Capacity Scaling for D2D Aided Cooperative Relaying Systems Using NOMA[J]. IEEE Wireless Communications Letters, 2018, 7(1): 42- 45.
[11] Liu Jiaqi, Xiao Sa, Geoffrey Y L, et al. Optimal Mobile Association and Power Allocation in Device-to-Device-enable Heterogeneous Networks with Non-Orthogonal Multiple Access Protocol[C]//IEEE International Conference on Communications. IEEE, 2018:1- 6.
[12] Chen Bingcai, Chen Yu, Chen Yunfei, et al. A Novel Spectrum Sharing Scheme Assisted by Secondary NOMA Relay[J]. IEEE Wireless Communications Letters, 2018, 7(5): 732-735.
[13] Kim J B, Lee I H. Capacity Analysis of Cooperative Relaying Systems Using Non-Orthogonal Multiple Access[J]. IEEE Communications Letters, 2015, 19(11): 1949-1953.
[14] Chatzigeorgiou I. Bounds on the Lambert Function and Their Application to the Outage Analysis of User Cooperation[J]. IEEE Communications Letters, 2013, 17(8): 1505-1508.