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Multipair Two-Way Half-Duplex DF Relaying With Massive Arrays and Imperfect CSI.
- Source :
- IEEE Transactions on Wireless Communications; May2018, Vol. 17 Issue 5, p3269-3283, 15p
- Publication Year :
- 2018
-
Abstract
- This paper considers a two-way half-duplex decode-and-forward relaying system, where multiple pairs of single-antenna users exchange information via a multiple-antenna relay. Assuming that the channel knowledge is nonideal and the relay employs maximum ratio processing, we derive a large-scale approximation of the sum spectral efficiency (SE) that is tight when the number of relay antennas M becomes very large. Furthermore, we study how the transmit power scales with M to maintain a desired SE. In particular, three special power-scaling cases are discussed and the corresponding asymptotic SE is deduced with clear insights. Our elegant power-scaling laws reveal a tradeoff between the transmit powers of the user/relay and pilot symbol. Finally, we formulate a power allocation problem in terms of maximizing the sum SE and obtain a local optimum by solving a sequence of geometric programming problems. [ABSTRACT FROM PUBLISHER]
Details
- Language :
- English
- ISSN :
- 15361276
- Volume :
- 17
- Issue :
- 5
- Database :
- Complementary Index
- Journal :
- IEEE Transactions on Wireless Communications
- Publication Type :
- Academic Journal
- Accession number :
- 129614673
- Full Text :
- https://doi.org/10.1109/TWC.2018.2808952