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Dynamic DS-CDMA aided by successive interference cancellation for massive grant-free multiple-access

Dynamic DS-CDMA aided by successive interference cancellation for massive grant-free multiple-access
Dynamic DS-CDMA aided by successive interference cancellation for massive grant-free multiple-access

We introduce a dynamic DS-CDMA (DyDS-CDMA) scheme for supporting massive grant-free multiple-Access (mGFMA), where each base-station (BS) or access point (AP) with limited degrees of freedom is expected to control a massive number of devices of ultra densely deployed. We assume that devices become active to transmit data on the basis of time-slots, and during a time-slot, each of devices activates independently and following a common activation probability. A low-complexity detector based on minimum mean-square error and successive interference cancellation, referred to as the MMSE-SICD, is proposed for signal detection in DyDS-CDMA systems. Assuming ideal active device identification and ideal channel estimation of active device, in this paper, we focus on the potential performance achievable by the DyDS-CDMA systems employing the MMSESICD. Our studies reveal that the DyDS-CDMA aided by the MMSE-SICD is high-efficiency for operation in mGFMA environments. Near single-user performance is achievable, when the average number of active devices per time-slot reaches two times of the system's degrees-of-freedom, and hence, the number of active devices of a time-slot may be much higher than two timing the system's degrees-of-freedom.

DS-CDMA, grant-free multiple-Access, interference cancellation, Internet of things, massive connectivity, non-orthogonal multiple-Access, ultra-dense deployment
IEEE
Zhang, Jiatian
ee0c77aa-6bcd-4e08-8ce1-d5bbcd600840
Pan, Peng
56ea394e-58af-4d6f-8bd5-d08784d3a7f8
Yang, Lie Liang
ae425648-d9a3-4b7d-8abd-b3cfea375bc7
Zhang, Jiatian
ee0c77aa-6bcd-4e08-8ce1-d5bbcd600840
Pan, Peng
56ea394e-58af-4d6f-8bd5-d08784d3a7f8
Yang, Lie Liang
ae425648-d9a3-4b7d-8abd-b3cfea375bc7

Zhang, Jiatian, Pan, Peng and Yang, Lie Liang (2018) Dynamic DS-CDMA aided by successive interference cancellation for massive grant-free multiple-access. In 2018 10th International Conference on Wireless Communications and Signal Processing, WCSP 2018. IEEE.. (doi:10.1109/WCSP.2018.8555901).

Record type: Conference or Workshop Item (Paper)

Abstract

We introduce a dynamic DS-CDMA (DyDS-CDMA) scheme for supporting massive grant-free multiple-Access (mGFMA), where each base-station (BS) or access point (AP) with limited degrees of freedom is expected to control a massive number of devices of ultra densely deployed. We assume that devices become active to transmit data on the basis of time-slots, and during a time-slot, each of devices activates independently and following a common activation probability. A low-complexity detector based on minimum mean-square error and successive interference cancellation, referred to as the MMSE-SICD, is proposed for signal detection in DyDS-CDMA systems. Assuming ideal active device identification and ideal channel estimation of active device, in this paper, we focus on the potential performance achievable by the DyDS-CDMA systems employing the MMSESICD. Our studies reveal that the DyDS-CDMA aided by the MMSE-SICD is high-efficiency for operation in mGFMA environments. Near single-user performance is achievable, when the average number of active devices per time-slot reaches two times of the system's degrees-of-freedom, and hence, the number of active devices of a time-slot may be much higher than two timing the system's degrees-of-freedom.

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More information

Published date: 30 November 2018
Venue - Dates: 10th International Conference on Wireless Communications and Signal Processing, WCSP 2018, , Hangzhou, China, 2018-10-18 - 2018-10-20
Keywords: DS-CDMA, grant-free multiple-Access, interference cancellation, Internet of things, massive connectivity, non-orthogonal multiple-Access, ultra-dense deployment

Identifiers

Local EPrints ID: 427612
URI: http://eprints.soton.ac.uk/id/eprint/427612
PURE UUID: 288cbaf8-aeb4-47a5-9406-62599e0418da
ORCID for Lie Liang Yang: ORCID iD orcid.org/0000-0002-2032-9327

Catalogue record

Date deposited: 24 Jan 2019 17:30
Last modified: 16 Mar 2024 03:00

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Contributors

Author: Jiatian Zhang
Author: Peng Pan
Author: Lie Liang Yang ORCID iD

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