Two Novel Downlink Precoding Schemes for TDD Massive MIMO Systems
-
摘要: 针对时分双工大规模MIMO系统，该文提出两种新的下行链路预编码方案，即新最大比合并(NMRC)和新迫零(NZF)方案，通过理论分析得到两种新预编码方案下目标用户和非目标用户的下行链路信干噪比和频谱效率的表达式，并与传统的迫零(ZF)和最大比合并(MRC)预编码的下行链路信干噪比、频谱效率和误码率性能进行比较。仿真结果表明，所提出的NMRC和NZF预编码与传统的MRC和ZF预编码相比，在不增加运算复杂度的前提下可以获得更好的性能，而且新的预编码方案在提高目标用户性能的同时，对其他非目标用户的性能也有一定的改善。Abstract: For time-division duplex massive MIMO systems, two new downlink precoding schemes are proposed, namely New Maximum Ratio Combining (NMRC) and New Zero-Forcing (NZF) scheme. Through theoretical analysis, the expressions of downlink signal to interference plus noise ratio and spectral efficiency of target users and non-target users under two new precoding schemes are obtained, and compared with traditional Zero-Forcing (ZF) and Maximum Ratio Combining (MRC) Precoding schemes for downlink signal to interference plus noise ratio, spectrum efficiency and bit error rate performance. The simulation results show that the proposed NMRC and NZF precoding can achieve better performance without increasing the computational complexity compared with the traditional MRC and ZF precoding. Moreover, the new precoding schemes improve the performance of target users while improving the performance of other non-target users.
-
[1] CHEN Zhilin, SOHRABI F, and YU Wei. Multi-cell sparse activity detection for massive random access: Massive MIMO versus cooperative MIMO[J]. IEEE Transactions on Wireless Communications, 2019, 18(8): 4060–4074. doi: 10.1109/TWC.2019.2920823 [2] NGO H Q, LARSSON E G, and MARZETTA T L. Energy and spectral efficiency of very large multiuser MIMO systems[J]. IEEE Transactions on Communications, 2013, 61(4): 1436–1449. doi: 10.1109/TCOMM.2013.020413.110848 [3] ATZENI I, ARNAU J, and DEBBAH M. Fractional pilot reuse in massive MIMO systems[C]. 2015 IEEE International Conference on Communication Workshop (ICCW), London, UK, 2015: 1030–1035. [4] ZHI Hui and DING Xiaoguang. Pilot allocation scheme based on coalition game for TDD massive MIMO systems[J]. EURASIP Journal on Wireless Communications and Networking, 2019, 2019: 60. doi: 10.1186/s13638-019-1372-x [5] GAO He, ZHANG Tiankui, FENG Chunyan, et al. Clustering based pilot allocation algorithm for mitigating pilot contamination in massive MIMO systems[C]. 2018 Asia-Pacific Microwave Conference (APMC), Kyoto, Japan, 2018: 878–880. [6] SRINIVAS B, MAWATWAL K, SEN D, et al. An iterative semi-blind channel estimation scheme and uplink spectral efficiency of pilot contaminated one-bit massive MIMO systems[J]. IEEE Transactions on Vehicular Technology, 2019, 68(8): 7854–7868. doi: 10.1109/TVT.2019.2926037 [7] GONG Zijun, LI Cheng, and JIANG Fan. Pilot decontamination in noncooperative massive MIMO cellular networks based on spatial filtering[J]. IEEE Transactions on Wireless Communications, 2019, 18(2): 1419–1433. doi: 10.1109/TWC.2019.2892775 [8] NEUPANE K, HADDAD R J, and MOORE D L. Secrecy analysis of massive MIMO systems with MRT precoding using normalization methods[C]. SoutheastCon 2018, Petersburg, Russia, 2018: 1–6. [9] CHEN Xihan, LIU An, CAI Yunlong, et al. Randomized two-timescale hybrid precoding for downlink multicell massive MIMO systems[J]. IEEE Transactions on Signal Processing, 2019, 67(16): 4152–4167. doi: 10.1109/TSP.2019.2926017 [10] CHEN J C. Efficient constant envelope precoding with quantized phases for massive MU-MIMO downlink systems[J]. IEEE Transactions on Vehicular Technology, 2019, 68(4): 4059–4063. doi: 10.1109/TVT.2019.2898902 [11] LI Xueru, BJORNSON E, LARSSON E G, et al. A multi-cell MMSE precoder for massive MIMO systems and new large system analysis[C]. 2015 IEEE Global Communications Conference (GLOBECOM), San Diego, USA, 2015: 1–6. [12] ZAYANI R, SHAÏEK H, and ROVIRAS D. Efficient precoding for massive MIMO downlink under PA nonlinearities[J]. IEEE Communications Letters, 2019, 23(9): 1611–1615. doi: 10.1109/LCOMM.2019.2924001 [13] REN Yuwei, XU Guixian, WANG Yingmin, et al. Low-complexity ZF precoding method for downlink of massive MIMO system[J]. Electronics Letters, 2015, 51(5): 421–423. doi: 10.1049/el.2014.3602 [14] KHANSEFID A and MINN H. Achievable downlink rates of MRC and ZF precoders in massive MIMO with uplink and downlink pilot contamination[J]. IEEE Transactions on Communications, 2015, 63(12): 4849–4864. doi: 10.1109/TCOMM.2015.2482965 [15] JOSE J, ASHIKHMIN A, MARZETTA T L, et al. Pilot contamination and precoding in multi-cell TDD systems[J]. IEEE Transactions on Wireless Communications, 2011, 10(8): 2640–2651. doi: 10.1109/TWC.2011.060711.101155 [16] JU Meiyan, XU Lu, JIN Lu, et al. Data aided channel estimation for massive MIMO with pilot contamination[C]. 2017 IEEE International Conference on Communications (ICC), Paris, France, 2017: 1–6. [17] ZHI Hui and HU Yanjun. Novel multi-cell precoding schemes for TDD massive MIMO systems[J]. Wireless Personal Communications, 2017, 97(4): 6111–6129. doi: 10.1007/s11277-017-4829-4 [18] PROAKIS J G, 著. 张力军, 张宗橙, 郑宝玉, 等译. 数字通信[M]. 4版. 北京: 电子工业出版社, 2003: 186–187.PROAKIS J G, Write. ZHANG Lijun, ZHANG Zongcheng, ZHENG Baoyu, et al., translation. Digital Communications[M]. 4th ed. Beijing: Publishing House of Electronics Industry, 2003: 186–187. -
下载:
图(7)
计量
- 文章访问数: 941
- HTML全文浏览量: 399
- PDF下载量: 87
- 被引次数: 0
下载:
