Robust Rate-Maximization Precoder Design for VFDM System
Robust Rate-Maximization Precoder Design for VFDM System
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DOI：
10.1109/tvt.2020.2964327
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发表时间：
2020-01
影响因子：
6.8
通讯作者：
Wenliang Liu;Qi Feng;Jiyong Pang;Qiyu Hu;Rui Yin;Guanding Yu
中科院分区：
文献类型：
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作者：
Wenliang Liu;Qi Feng;Jiyong Pang;Qiyu Hu;Rui Yin;Guanding Yu
新的无线电(NR)系统最近被提议与长期演进(LTE)系统一起部署，以提高无线通信容量。范德蒙德-子空间频分复用(VFDM)是一种适用于这种双层网络的有效技术，通过该技术，NR发射机可以重复使用LTE系统的频谱，同时保证LTE不受干扰。在本文中，我们首先研究了变频分多址系统中的健壮率最大化问题。在信道状态信息(CSI)不完全的情况下，对预编码器进行了优化，使其既满足对LTE系统的无干扰，又满足NR系统的速率最大化。为了解决这类非凸问题，提出了一种基于块坐标下降(BCD)和惩罚对偶分解(PDD)方法的迭代算法。仿真结果表明，与传统的基于奇异值分解的可变频分复用技术相比，该算法在稳健性和可达到率方面具有明显的优势。
The new radio (NR) system is recently proposed to deploy alongside the long term evolution (LTE) system to improve the wireless communication capacity. The Vandermonde-subspace frequency division multiplexing (VFDM) is an efficient technique for such a two tier network, whereby the NR transmitter can reuse the frequency spectrum of LTE system meanwhile guaranteeing interference free to LTE. In this paper, we first investigate the robust rate-maximization problem in the VFDM system. In the condition of imperfect channel state information (CSI), the precoder is optimized to satisfy both non-interference to LTE system and rate-maximization in the NR system. To tackle the challenge in solving such a non-convex problem, an iterative algorithm is proposed based on the block coordinate descent (BCD) and penalty dual decomposition (PDD) methods. Finally, simulation results demonstrate the superiority of the proposed algorithm in terms of robustness and achievable rate over the conventional SVD-based VFDM technique.