Joint interference mitigation approach using space‐time pilot design in large‐scale antenna systems
| Autor: | Yang Zhang, Pengbiao Wang, Rong Li, Xiaokai Liu, Chenglin Zhao |
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| Rok vydání: | 2016 |
| Předmět: |
Computer science
Space time 05 social sciences Real-time computing Duplex (telecommunications) 050801 communication & media studies 020206 networking & telecommunications 02 engineering and technology Interference (wave propagation) Computer Science Applications Base station 0508 media and communications Time-division multiplexing 0202 electrical engineering electronic engineering information engineering Cellular network Maximal-ratio combining Network performance Time domain Electrical and Electronic Engineering Simulation Communication channel |
| Zdroj: | IET Communications. 10:253-262 |
| ISSN: | 1751-8636 |
| Popis: | This study addresses the problem of interference mitigation in multi-cell time division duplex cellular networks with large-scale antennas. Network performance in such systems is hampered by pilot contamination effect, which results in the inter-cell interference. To mitigate the interference, the authors propose a space-time pilot design-based approach to jointly eliminate interference from both time domain and space domain. The authors’ space-time pilot design divides a cellular network into different groups which proceed channel estimation alternately in time. Moreover, a low-rate coordination assisted pilot assignment scheme is added into each cell group during its pilot phase. This pilot assignment scheme relies on the minimum mean square of the updated Bayesian channel estimation. It can make use of the second-order statistical information about the users' channel vectors within the same group to assign an identical pilot sequence to users that tend to interfere with each other at a lower level. On the basis of space-time pilot design, the base station can proceed the maximal ratio transmitting and maximal ratio combining. With rigorous theoretic proof, their joint approach is able to significantly decrease interference. Simulations verified its excellent performance promotion. |
| Databáze: | OpenAIRE |
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