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Article Dans Une Revue IEEE Transactions on Wireless Communications Année : 2023

Vector Coded Caching Multiplicatively Increases the Throughput of Realistic Downlink Systems

Hui Zhao
Antonio Bazco-Nogueras
Petros Elia

Résumé

The recent introduction of vector coded caching has revealed that multi-rank transmissions in the presence of receiver-side cache content can dramatically ameliorate the file-size bottleneck of coded caching and substantially boost performance in error-free wire-like channels. In this work, we employ largematrix analysis to explore the effect of vector coded caching in realistic wireless multi-antenna downlink systems. For a given downlink MISO system already optimized to exploit both multiplexing and beamforming gains, and for a fixed set of antenna and SNR resources, our analysis answers a simple question: What is the multiplicative throughput boost obtained from introducing reasonably-sized receiver-side caches that can prestore information content? The derived closed-form expressions capture various linear precoders, and a variety of practical considerations such as power dissemination across signals, realistic SNR values, as well as feedback costs. The schemes are very simple (we simply collapse precoding vectors into a single vector), and the recorded gains are notable. For example, for 32 transmit antennas, a received SNR of 20 dB, a coherence bandwidth of 300 kHz, a coherence period of 40 ms, and under realistic file-size and cache-size constraints, vector coded caching is here shown to offer a multiplicative throughput boost of about 310% with ZF/RZF precoding and a 430% boost in the performance of already optimized MF-based (cacheless) systems. Interestingly, vector coded caching also accelerates channel hardening to the benefit of feedback acquisition, often surpassing 540% gains over traditional hardening-constrained cacheless downlink systems.
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Dates et versions

hal-04139626 , version 1 (23-06-2023)

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Citer

Hui Zhao, Antonio Bazco-Nogueras, Petros Elia. Vector Coded Caching Multiplicatively Increases the Throughput of Realistic Downlink Systems. IEEE Transactions on Wireless Communications, 2023, 22 (4), pp.2683-2698. ⟨10.1109/TWC.2022.3213475⟩. ⟨hal-04139626⟩

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