A Co-Existence Power Domain Non-Orthogonal Multiple Access Using Walsh-Hadamard and Pseudo-Noise Waveforms

Shalini, R. Baby; Stuwart, S. Lenty

doi:10.1007/s11277-022-09606-0

Cited by 4 publications

(3 citation statements)

References 23 publications

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“…Additionally, the utilization of cyclic interleaving in a multiple-access system with two distinct waveform signals promoted fairness among users, particularly those experiencing extreme channel conditions. 26 The primary objective of this scheme was to address the challenge of ISI elimination within multipath channels.…”

Section: Introductionmentioning

confidence: 99%

“…The primary objective of this study is to enhance the multipath diversity in a time-dispersive channel. Our previous works [21][22][23][24][25][26] introduced an m-sequence-based simple cyclic scheme to explore the inherent diversity in multipath propagation. The recently proposed cyclic interleaving architecture was suitably modified to incorporate IDMA, NOMA, single-carrier frequency division multiple access (SC-FDMA), SC-FDMA NOMA, and co-existing carrier schemes.…”

Section: Introductionmentioning

confidence: 99%

“…Here, cyclic‐frequency division was performed on the transmitter side, which aided multipath combining using MRC and, in turn, enhanced the performance of users at the cell edge. Additionally, the utilization of cyclic interleaving in a multiple‐access system with two distinct waveform signals promoted fairness among users, particularly those experiencing extreme channel conditions 26 . The primary objective of this scheme was to address the challenge of ISI elimination within multipath channels.…”

Section: Introductionmentioning

confidence: 99%

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Identical code‐data cyclic shift transmission for time‐dispersive channel

Vasudevan,

Stuwart

2024

Trans Emerging Tel Tech

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Multiple access techniques working on time‐dispersive channels must employ spreading codes with good correlation properties to minimize multipath interference and multiple access interference. Popular spreading codes, such as the Walsh‐Hadamard code (orthogonal) and maximal length sequence (m‐sequence) (semi‐orthogonal), suffer from intersymbol interference (ISI). ISI increases owing to the poor autocorrelation properties of the spreading codes, resulting in a deteriorated bit‐error‐rate (BER) performance. Recently, a cyclic interleaving transmission has been proposed to enhance multipath diversity in the presence of ISI. In this study, an identical code‐data cyclic shift (ICDCS) transmission scheme is introduced to achieve improved multipath diversity in time‐dispersive channels. The proposed ICDCS transmission is designed based on cyclically shifting identical codes and data. The code and data involved in the first set of spreading are cyclically shifted for the next set of spreading, and the two sets are blended to perform cyclic interleaving. The data are despread from each multipath component at the receiver using different codes derived from a single m‐sequence through identical code cyclic shifting (ICCS). Consequently, multipath diversity increases, resulting in a significant reduction in the BER. ICDCS transmission effectively utilizes all multipath components and the codes derived from the ICCS to mitigate ISI. The simulation results confirm that the proposed ICDCS transmission significantly enhances the multipath diversity compared to the conventional cyclic interleaving transmission scheme.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Identical code‐data cyclic shift transmission for time‐dispersive channel

Vasudevan,

Stuwart

2024

Trans Emerging Tel Tech

Self Cite

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An Identical Code–Data Based Nonorthogonal Multiple Access

Vasudevan,

Stuwart

2024

Int J Communication

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Nonorthogonal multiple access (NOMA) is a promising technique operating with limited resources. NOMA can be executed in both power and code domains. Cyclic interleaved NOMA strategies are debated in recent literature, combining power and code domains. Identical code cyclic shift (ICCS) transmission is viewed to be a bridge between code division access and NOMA. We propose identical code–data cyclic shift NOMA (ICDCS‐NOMA) in which the code and data are cyclically shifted in distinction to simple cyclic interleaved transmission introduced in our earlier work and the ICCS transmission. The cell‐edge user in a NOMA pair engages its signal transmission using ICDCS; in contrast, the cell‐center user prefers simple cyclic interleaved transmission. The spread data stream and its cyclic shifted version are blended in ICDCS, followed by cyclic interleaving. A distinct and extreme fading channel pair is assumed with the same number of paths for the edge and center users. Diversity combining multipath signals is embraced at the edge user terminal, and frequency domain equalization (FDE)/matched filter (MF) receiver is employed at the center user. The simulation indicates the dominance of the proposed ICDCS‐NOMA transmission in terms of the attained diversity gain over the conventional, ICCS, and simple cyclic interleaved transmissions.

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Decorrelative successive interference cancellation for cyclic interleaved frequency division multiplexing

Anuthirsha,

Stuwart

2024

Telecommun Syst

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A Co-Existence Power Domain Non-Orthogonal Multiple Access Using Walsh-Hadamard and Pseudo-Noise Waveforms

Cited by 4 publications

References 23 publications

Identical code‐data cyclic shift transmission for time‐dispersive channel

Identical code‐data cyclic shift transmission for time‐dispersive channel

An Identical Code–Data Based Nonorthogonal Multiple Access

Decorrelative successive interference cancellation for cyclic interleaved frequency division multiplexing

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