Cyclic interleaving scheme for an IFDMA system

Kumar, J. Arun; Stuwart, S. Lenty

doi:10.1007/s12243-020-00748-5

Cited by 7 publications

(6 citation statements)

References 23 publications

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“…But the conventional interleaving with MMSE-FDE achieves only marginal diversity gain because the multipaths are only partially resolvable. Furthermore, the proposed scheme enhances the data rate by L times and retains similar BER performance, compared to Arun Kumar and Lenty Stuwart, 20 with modest increase in complexity.…”

Section: Conventional Versus Proposed System Performancementioning

confidence: 94%

“…Figure 11 depicts the advantage of the proposed method with the existing researched result 20 in terms of the BER metric. The simulation is carried out for the parameters N ¼ 63, M ¼ 6, and k r = À100 dB with the variable transmission of multiple data streams L ¼ 1, 2, 3, 5, 7, and 9 ð Þ for a specific SNR of 10 dB.…”

Section: Diversity Order Calculationsmentioning

confidence: 99%

“…A novel cyclic interleaving scheme for single data stream transmission in an IFDMA system is developed. 20 The scheme ensures ISI minimization and performs efficient detection of users' data with reduced complexity. A robust frequency-domain decision feedback equalization technique that jointly mitigates ISI and phase noise is introduced by Iqbal et al 21 Furthermore, highly reliable symbols are fed back eventually lowering the error propagation in the decision feedback equalization technique at the expense of increased computational complexity.…”

mentioning

confidence: 99%

“…The proposed scheme ensures simple ISI equalization and efficient multiuser detection compared to other complex methods. Also, the present scheme leverages the available spreading codes to enhance the overall performance compared to Arun Kumar and Lenty Stuwart, 20 which utilize only limited spreading codes. More specifically, the proposed scheme serves as an extension of Arun Kumar and Lenty Stuwart, 20 and the present scheme improves spectral efficiency compared to the single data stream transmission system.…”

mentioning

confidence: 99%

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Intersymbol interference resilient interleaving architecture for multi‐stream interleaved frequency division multiple access system

Kumar¹,

Stuwart

2022

Int J Communication

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A multi-stream cyclic interleaving architecture for an interleaved frequency division multiple access (IFDMA) system is proposed. The proposed scheme exploits the full benefits of maximal length sequence (m-sequence), in contrast to single data stream transmission scheme proposed in earlier works, thereby allowing simultaneous transmission of multiple data streams by each user. The cyclic spreading allows the separation of multiple data streams for each user in addition to intersymbol interference (ISI) minimization. The assignment of orthogonal subcarriers to each user compensates multiuser interference (MUI). The increase in the number of data stream transmission improves the data rate of the system. The proposed scheme employs maximal ratio combining (MRC) to maximize the instantaneous signal-to-noise ratio (SNR) of the multipath signal. The performances of the proposed interleaving scheme are compared with the minimum mean square error frequency domain equalization (MMSE-FDE)-based conventional interleaving scheme. Despite the simultaneous transmission of multiple data streams, the proposed scheme retains the performance of single data stream transmission.

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Section: Conventional Versus Proposed System Performancementioning

confidence: 94%

Section: Diversity Order Calculationsmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Intersymbol interference resilient interleaving architecture for multi‐stream interleaved frequency division multiple access system

Kumar¹,

Stuwart

2022

Int J Communication

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“…A cyclic interleaving scheme has also been proposed for single-carrier transmission. 24 This innovative scheme achieved multipath orthogonality within a challenging Rayleigh channel environment, surpassing conventional interleaving methods. The cyclic nature of the spreading code played a crucial role in eliminating the ISI.…”

Section: Introductionmentioning

confidence: 99%

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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CFO and PAPR Analysis for Single‐ and Multistream CIFDMA System

Kumar,

Stuwart

2024

Int J Communication

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The paper investigates the performance of a cyclic interleaved frequency division multiple access (CIFDMA) system proposed in our earlier works. In our present study, the carrier frequency offset (CFO) and the peak‐to‐average power ratio (PAPR) analysis are done for the proposed CIFDMA, supporting single and multiple data stream transmissions. The proposed system is analyzed without employing any compensation technique needed to alleviate the effect of CFO and PAPR. The CIFDMA delivers superior performance over the conventional IFDMA system under low and moderate CFOs. Besides, the bit error ratio (BER) versus signal‐to‐noise ratio (SNR) performance comparisons for constant and random CFOs reveal the dominance of the proposed system over the conventional system for both single and multiple data stream transmissions. The PAPR performance of the proposed system is superior to the orthogonal frequency division multiple access (OFDMA) system. However, the PAPR of the proposed system escalates by an acceptable margin to that of the conventional system, and the deviation in the PAPR value falls within the acceptable range. The simulation results conclude that the proposed CIFDMA system will better replace the conventional IFDMA system for next‐generation communications.

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Cyclic interleaving scheme for an IFDMA system

Cited by 7 publications

References 23 publications

Intersymbol interference resilient interleaving architecture for multi‐stream interleaved frequency division multiple access system

Intersymbol interference resilient interleaving architecture for multi‐stream interleaved frequency division multiple access system

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

CFO and PAPR Analysis for Single‐ and Multistream CIFDMA System

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