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Concurrent OFDM demodulation and turbo decoding for ultra reliable low latency communication

Concurrent OFDM demodulation and turbo decoding for ultra reliable low latency communication
Concurrent OFDM demodulation and turbo decoding for ultra reliable low latency communication

The Ultra-Reliable Low Latency Communication (URLLC) applications have been proposed in recent years, targeting a round-trip end-to-end latency less than 1 ms with high reliability. Therefore, an order of magnitude improvements are needed in all layers of the wireless communication stack. This is a particular challenge for the physical layer, where typically a processing time of the order of microseconds is required for the computationally intensive demodulation and error correction processing, among other operations. Conventionally, the reception of signals, the demodulation processing and the error correction processing are performed consecutively at the receiver. However, this approach is associated with processing times on the order of hundreds of microseconds, preventing URLLC. Therefore, this paper proposes a novel processing architecture, which is capable of performing reception, Orthogonal Frequency Division Multiplexing (OFDM) demodulation and turbo decoding concurrently, rather than consecutively, hence significantly reducing the processing time. In order to achieve concurrent operation, the OFDM demodulation is performed using a novel cumulative Fast Fourier Transform (FFT), which produces successively more reliable estimates of all transmitted symbols in each successive clock cycle. At the same time, a Fully-Parallel Turbo Decoder (FPTD) is used to recover successively more reliable estimates of all bits in each successive clock cycle.

Fast Fourier Transform (FFT), Fully-Parallel Turbo Decoder (FPTD), Orthogonal Frequency Division Multiplexing (OFDM), latency
0018-9545
1281-1290
Xiang, Luping
ee0a15fb-5774-4004-b236-e301d323d786
Maunder, Robert
76099323-7d58-4732-a98f-22a662ccba6c
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Xiang, Luping
ee0a15fb-5774-4004-b236-e301d323d786
Maunder, Robert
76099323-7d58-4732-a98f-22a662ccba6c
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1

Xiang, Luping, Maunder, Robert and Hanzo, Lajos (2020) Concurrent OFDM demodulation and turbo decoding for ultra reliable low latency communication. IEEE Transactions on Vehicular Technology, 69 (2), 1281-1290, [8939423]. (doi:10.1109/TVT.2019.2961746).

Record type: Article

Abstract

The Ultra-Reliable Low Latency Communication (URLLC) applications have been proposed in recent years, targeting a round-trip end-to-end latency less than 1 ms with high reliability. Therefore, an order of magnitude improvements are needed in all layers of the wireless communication stack. This is a particular challenge for the physical layer, where typically a processing time of the order of microseconds is required for the computationally intensive demodulation and error correction processing, among other operations. Conventionally, the reception of signals, the demodulation processing and the error correction processing are performed consecutively at the receiver. However, this approach is associated with processing times on the order of hundreds of microseconds, preventing URLLC. Therefore, this paper proposes a novel processing architecture, which is capable of performing reception, Orthogonal Frequency Division Multiplexing (OFDM) demodulation and turbo decoding concurrently, rather than consecutively, hence significantly reducing the processing time. In order to achieve concurrent operation, the OFDM demodulation is performed using a novel cumulative Fast Fourier Transform (FFT), which produces successively more reliable estimates of all transmitted symbols in each successive clock cycle. At the same time, a Fully-Parallel Turbo Decoder (FPTD) is used to recover successively more reliable estimates of all bits in each successive clock cycle.

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ofdm-fptd-double-1221 - Accepted Manuscript
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Accepted/In Press date: December 2019
e-pub ahead of print date: 23 December 2019
Published date: February 2020
Additional Information: Funding Information: Manuscript received December 21, 2018; revised November 7, 2019; accepted December 18, 2019. Date of publication December 23, 2019; date of current version February 12, 2020. The work of L. Hanzo was supported by the Engineering and Physical Sciences Research Council under Projects EP/Noo4558/1, EP/PO34284/1, COALESCE, of the Royal Society’s Global Challenges Research Fund Grant and also of the European Research Council’s Advanced Fellow Grant QuantCom. The review of this article was coordinated by Prof. I. Bisio. (Corresponding author: Lajos Hanzo.) The authors are with the Electronics and Computer Science, University of Southampton, Southampton SO17 1BJ, U.K. (e-mail: lx1g15@ecs.soton.ac.uk; rm@ecs.soton.ac.uk; lh@ecs.soton.ac.uk). Digital Object Identifier 10.1109/TVT.2019.2961746 Publisher Copyright: © 1967-2012 IEEE.
Keywords: Fast Fourier Transform (FFT), Fully-Parallel Turbo Decoder (FPTD), Orthogonal Frequency Division Multiplexing (OFDM), latency

Identifiers

Local EPrints ID: 436902
URI: http://eprints.soton.ac.uk/id/eprint/436902
ISSN: 0018-9545
PURE UUID: 60b7602d-0f47-4758-a145-ce27f78ddf89
ORCID for Luping Xiang: ORCID iD orcid.org/0000-0003-1465-6708
ORCID for Robert Maunder: ORCID iD orcid.org/0000-0002-7944-2615
ORCID for Lajos Hanzo: ORCID iD orcid.org/0000-0002-2636-5214

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Date deposited: 13 Jan 2020 17:34
Last modified: 13 Aug 2022 01:44

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Contributors

Author: Luping Xiang ORCID iD
Author: Robert Maunder ORCID iD
Author: Lajos Hanzo ORCID iD

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