A Constant-Gap Result on the Multi-Antenna Broadcast Channels with Linearly Precoded Rate Splitting

Abstract : In this paper, we consider a simple downlink channel with a multi-antenna base station and two single-antenna receivers. We assume that the channel is deterministic and known to all the nodes. Our contribution is two-fold. First, we show that linear precoding with private streams can have unbounded gap to the capacity of the channel. Second, we show that using rate-splitting with a simple power allocation one can achieve the sum capacity to within a constant gap for any channel realization.
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https://hal.archives-ouvertes.fr/hal-01912264
Contributor : Zheng Li <>
Submitted on : Monday, November 5, 2018 - 12:01:18 PM
Last modification on : Friday, April 12, 2019 - 1:12:05 PM

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Sheng Yang, Zheng Li. A Constant-Gap Result on the Multi-Antenna Broadcast Channels with Linearly Precoded Rate Splitting. 19th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC 2018), Jun 2018, Kalamata, Greece. ⟨10.1109/SPAWC.2018.8446000⟩. ⟨hal-01912264⟩

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