Massive MIMO is Very Useful for Pilot-Free Uplink Communications
- Title
- Massive MIMO is Very Useful for Pilot-Free Uplink Communications
- Authors
- LEE, NAMYOON
- Date Issued
- 2019-02-05
- Publisher
- Institute of Electrical and Electronics Engineers Inc.
- Abstract
- Pilot-free (or non-coherent) communications are of great significance for short-packet communications in beyond 5G applications. The absence of pilots brings a fundamental challenge when decoding a message because of no knowledge of channel state information at a receiver. In this paper, we aim to show that a massive number of antennas at a base station (BS) is very useful for pilot-free uplink communications. Specifically, for a single-input multiple-output channel, we show that the spectral efficiency linearly scales with channel coherence time, provided that the number of antennas is infinite. We prove this result by both a variant of binary sparse superposition codes and a compressive covariance sensing-based decoding method. We also present a novel covariance matching pursuit (CMP) decoding method that is computationally efficient yet achieving a nearoptimal decoding performance. By simulations, we demonstrate the proposed decoding algorithm significantly outperforms the existing approximated message-passing based algorithm.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/106493
- Article Type
- Conference
- Citation
- IEEE ITA 2020, 2019-02-05
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