Relay-Assisted Carrier Aggregation (RACA) Uplink System for Enhancing Data Rate of Extended Reality (XR)

In Extended Reality (XR) applications, high data rates and low latency are crucial for immersive experiences. Uplink transmission in XR is challenging due to the limited antennas and power of lightweight XR devices. To improve data transmission rates, we investigate a relay-assisted carrier aggregat...

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Bibliographic Details
Published in:IEEE transactions on vehicular technology 2024-12, p.1-14
Main Authors: Chen, Chi-Wei, Tsai, Wen-Chiao, Tsai, Lung-Sheng, Wu, An-Yeu
Format: Article
Language:English
Subjects:
Amplify-and-forward (AF) relay
Antenna arrays
Antennas
Bandwidth
carrier aggregation
Extended Reality (XR)
Frequency conversion
Frequency division multiplexing
Optimization
Protocols
rank augmentation
Relays
Signal to noise ratio
Transmitting antennas
weighted mean square error minimization (WMMSE)
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Summary:In Extended Reality (XR) applications, high data rates and low latency are crucial for immersive experiences. Uplink transmission in XR is challenging due to the limited antennas and power of lightweight XR devices. To improve data transmission rates, we investigate a relay-assisted carrier aggregation (RACA) system. The XR device simultaneously transmits data to an access point (AP) and a relay in proximity over low-frequency and high-frequency bands, respectively. Then, the relay down-converts and amplifies the signals to the AP, effectively acting as an additional transmit antenna for the XR device. In this paper, we propose two algorithms to maximize the data rate of the XR device in their respective protocols. In the centralized protocol, the rate maximization problem is equivalently transformed as a weighted mean square error minimization (WMMSE) problem which can be solved iteratively by alternative optimization. In the distributed protocol, the rate maximization problem is decomposed into two independent subproblems where the rate of the direct link and the rate of the relay link are maximized by singular value decomposition (SVD)- based methods with water-filling (WF). Simulation results show that the rate of the RACA system is improved by 32% compared to that of the conventional carrier aggregation scheme.
ISSN:0018-9545
1939-9359
DOI:10.1109/TVT.2024.3523969