CSI feedback reduction by checking its validity period

Cai, Yuanhang; Xi, Wei; Wang, Zhi; Zhao, Kun; Han, Jinsong; Qian, Chen; Ding, Han; Zhao, Jizhong

doi:10.1145/2973750.2985281

Cited by 2 publications

(2 citation statements)

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“…Some strategies advocate reuse CSI to transmit more data packets according to CSI feature. Gabriel [2] reuses CSI by checking its validity period, which is obtained by Fdistribution test of two CSI samples. RoFi [11] senses the rotation of device using Power Delay Profile (PDP) similarity and achieves rotation-aware CSI feedback while maintaining high throughput.…”

Section: Related Workmentioning

confidence: 99%

“…On the other hand, many novel channel sounding mechanisms are designed to reduce CSI feedback times. Some approaches support CSI share among location-related users [7,21], some [2,11,20] reuse CSI according to the similarity of CSI samples before and after, and some utilize simple CSI or zero CSI feedback strategies [15,16,18,22,23] to access channel. Lacking timely discriminative CSI feedback, however, fuzzy channel estimation can neither resist the effect of multi-path channel fading, nor avoid the accumulative error drift problem over time.…”

Section: Introductionmentioning

confidence: 99%

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TAB: CSI Lossless Compression for MU-MIMO Network

Han

et al. 2021

Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering

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Multi-user MIMO (MU-MIMO) is an important technology to improve data transmission efficiency for future network, such as 5G and WiFi 6, due to its ability of enabling multi-users' concurrent transmissions. To achieve concurrent diversity gains, MU-MIMO network resource allocation relies on the feedback of Channel State Information (CSI) from multiple clients. CSI feedbacks from large user population, however, heavily degrade the throughput of a MU-MIMO network. Pursuing smart CSI feedback, we present a CSI timeliness-aware balanced mechanism, named TAB. It is a novel MU-MIMO protocol to eliminate unnecessary feedback overhead and improve CSI utilization within channel coherence time. TAB is fully compatible with the WiFi 5/6 standard and most state-of-the-art CSI feedback strategies, and is easy to be deployed on existing WiFi systems. Our software-radio based implementation and testbed experimentation demonstrate that TAB substantially improves the throughput of both downlink and uplink MU-MIMO network by 1.5× at least.

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Section: Related Workmentioning

confidence: 99%