Power Allocation and Performance Analysis in Overlay Cognitive Cooperative V2V Communication System With Outdated CSI

Liang, Xiaolin; Li, Yingjie; Cao, Wangbin; Zhao, Shuhuan; Liu, Shuaiqi; Zhao, Xiongwen

doi:10.1109/tits.2022.3170352

Cited by 6 publications

(1 citation statement)

References 29 publications

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“…The performance of both BLP and SLP are sensitive to channel uncertainties due for example to channel estimation errors, quantization noise or latency-related effects [28]- [30]. To mitigate the impact of such errors, robust designs are needed that properly model the errors and account for their effect in the optimization of the precoders.…”

Section: Introductionmentioning

confidence: 99%

Robust Symbol Level Precoding for Overlay Cognitive Radio Networks

Liu

Masouros

Swindlehurst

2024

IEEE Trans. Wireless Commun.

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This paper focuses on designing robust symbol-level precoding (SLP) in an overlay cognitive radio (CR) network, where the primary and secondary networks transmit signals concurrently. When the primary base station (PBS) shares data and perfect channel state information (CSI) with the cognitive base station (CBS), we derive an SLP approach that minimizes the CR transmission power and satisfies symbol-wise Safety Margin (SM) constraints of both primary users (PUs) and cognitive users (CUs). The resulting optimization has a quadratic objective and linear inequality (LI) constraints, which can be solved by standard convex methods. For the case of imperfect CSI from the PBS, we propose robust SLP schemes. First, with a norm-bounded CSI error model to approximate the uncertain channels, we adopt a max-min philosophy to conservatively achieve robust SLP constraints. Second, we use the additive quantization noise model (AQNM) to describe the quantized PBS CSI and employ a stochastic constraint to formulate the problem. Both robust approaches also result in a quadratic objective with LI constraints. Simulation results show that, rather than simply trying to eliminate the network's cross-interference, the proposed robust SLP schemes enable the primary and secondary networks to aid each other in meeting their quality of service constraints.

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Section: Introductionmentioning

confidence: 99%