An Improved Dropping Algorithm for Line-of-Sight Massive MIMO With Tomlinson–Harashima Precoding
| Autor: | Ulf Gustavsson, Frans M. J. Willems, Amirashkan Farsaei, Alex Alvarado |
|---|---|
| Přispěvatelé: | Information and Communication Theory Lab, Signal Processing Systems, Center for Wireless Technology Eindhoven |
| Rok vydání: | 2019 |
| Předmět: |
line-of-sight
Spatial correlation Correlated users Computer science MIMO 020206 networking & telecommunications Tomlinson-Harashima precoding 02 engineering and technology Precoding Computer Science Applications Power (physics) Modeling and Simulation massive MIMO 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Algorithm max-min power control Computer Science::Information Theory Power control Communication channel |
| Zdroj: | IEEE Communication Letters IEEE Communications Letters, 23(11):8794605, 2099-2103. Institute of Electrical and Electronics Engineers |
| ISSN: | 2373-7891 1089-7798 |
| Popis: | One of the problems in line-of-sight massive MIMO is that a few users can have correlated channel vectors. To alleviate this problem, a dropping algorithm has been proposed in the literature, which drops some of the correlated users to make the spatial correlation among the remaining users be less than a certain threshold. Thresholds were found by running a large number of simulations. In this letter, the same dropping algorithm is analyzed for a known nonlinear precoder: Tomlinson-Harashima precoder. Instead of simulation-based thresholds, closed-form analytical expressions are derived in this letter for two power allocation schemes: max-min and equal received power control schemes. It is shown that the derived thresholds are optimal in terms of achievable sum-rate when there is only one correlated pair of users. For channels with multiple pairs of correlated users, simulation results show that using the derived thresholds improves the 5th percentile sum-rate. Due to the fairness criterion of max-min, the improvement for max-min power control is much higher than equal received power control. |
| Databáze: | OpenAIRE |
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