参考文献/References:
[1] Zuo J, Zhang J, Yuen C, et al. Multicell multiuser massive MIMO transmission with downlink training and pilot contamination precoding[J]. IEEE Transactions on Vehicular Technology, 2016, 65(8): 6301-6314. DOI:10.1109/tvt.2015.2475284.
[2] Larsson E,Edfors O, Tufvesson F, et al. Massive MIMO for next generation wireless systems[J]. IEEE Communications Magazine, 2014, 52(2): 186-195. DOI:10.1109/mcom.2014.6736761.
[3] Saleh A A M, Rustako A, Roman R. Distributed antennas for indoor radio communications[J]. IEEE Transactions on Communications, 1987, 35(12): 1245-1251. DOI:10.1109/tcom.1987.1096716.
[4] Li J, Wang D, You X, et al. Spectral efficiency analysis of single-cell multi-user large-scale distributed antenna system[J]. IET Communications, 2014, 8(12): 2213-2221. DOI:10.1049/iet-com.2013.0855.
[5] You X H, Wang D M,Sheng B, et al. Cooperative distributed antenna systems for mobile communications[J]. IEEE Wireless Communications, 2010, 17(3): 35-43. DOI:10.1109/mwc.2010.5490977.
[6] Lu L, Li G Y,Swindlehurst A L, et al. An overview of massive MIMO: Benefits and challenges[J]. IEEE Journal of Selected Topics in Signal Processing, 2014, 8(5): 742-758. DOI:10.1109/jstsp.2014.2317671.
[7] Bjornson E, Larsson E G,Marzetta T L. Massive MIMO: Ten myths and one critical question[J]. IEEE Communications Magazine, 2016, 54(2): 114-123. DOI:10.1109/mcom.2016.7402270.
[8] Interdonato G, Ngo H Q, Larsson E G, et al. How much do downlink pilots improve cell-free massive MIMO?[C]// Global Communications Conference. Washington DC, USA, 2016: 1-7.
[9] Ngo H Q, Larsson E G,Marzetta T L. Massive MU-MIMO downlink TDD systems with linear precoding and downlink pilots[C]// 2013 51st Annual Allerton Conference on Communication, Control, and Computing. Monticello, Illinois, USA,2013: 293-298.
[10] Truong K T, Heath R W. Effects of channel aging in massive MIMO systems[J]. Journal of Communications and Networks, 2013, 15(4): 338-351. DOI:10.1109/jcn.2013.000065.