New Transceiver Designs for Interleaved Frequency-Division Multiple Access

Liew, Soung Chang; Shao, Yulin

doi:10.1109/twc.2020.3015723

Cited by 8 publications

(18 citation statements)

References 16 publications

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“…A quick summary of the content and key results of [20] are as follows: i) In [20], we devise a class of new transceiver designs for IFDMA systems that are significantly less complex than conventional IFDMA transceiver. The simple new designs are founded on a key observation that multiplexing and demultiplexing of IFDMA data streams of different sizes are coincident with the IFFTs and FFTs of different sizes embedded within the Cooley-Tukey recursive FFT [23] decomposition scheme.…”

Section: Overview Of Our Key Resultsmentioning

confidence: 99%

“…ii) In [20], we study the PAPR performance of multi-stream IFDMA benchmarked against Localized FDMA (LFDMA) and OFDMA. It is shown that the minimal partition (the partition results in the minimum number of sub-requests) yields the best PAPR performance.…”

Section: Overview Of Our Key Resultsmentioning

confidence: 99%

“…The current paper focuses on only the resource allocation issues arising from IFDMA and multi-stream IFDMA. The reader is referred to [20] on how issues a) and b) are addressed.…”

Section: Overview Of Our Key Resultsmentioning

confidence: 99%

“…When the prime factorization of M is not unique, we can only choose one of the possible prime factorizations to serve as the architectural bedrock for our digit-reversal subcarrier-allocation algorithm and the transceiver designs (see our companion paper [20]). Intermixing of different factorizations by different users (i.e., different users assume different factorizations) will lead to inconsistencies in the subcarrier allocation, as well as the multiplexing and demultiplexing processes in the transceiver design.…”

Section: Appendix a Digit-reversal Subcarrier Allocation For Composit...mentioning

confidence: 99%

“…In fact, the imposed rigidity of IFDMA belies nice mathematical structures that can be exploited to simplify subcarrier allocation and transceiver design Specifically, (i) the bit-reversal mapping, and (ii) signal modulations of IFDMA streams of different sizes can be interpreted as FFTs of different scales embedded within the overall Cooley-Tukey FFT recursive decomposition scheme. The simple IFDMA transceiver designs inspired by (ii) are treated comprehensively in our companion paper [20]. The main focus of this paper is on subcarrier allocation in IFDMA systems and we will exploit (i) to simplify the process.…”

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confidence: 99%

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Flexible Subcarrier Allocation for Interleaved Frequency Division Multiple Access

Shao,

Liew

2020

Preprint

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Interleaved Frequency Division Multiple Access (IFDMA) and Orthogonal FDMA (OFDMA) belong to a class of signal modulation and multiple-access techniques in which information of multiple users are multiplexed and carried on subcarriers within a shared spectrum. Compared with OFDMA, IFDMA has lower Peak-to-Average Power Ratio (PAPR). However, IFDMA poses two rigid constraints on subcarrier allocation: 1) the subcarriers occupied by a user must be evenly-spaced among the available subcarriers. 2) the number of subcarriers used by a user must be a divisor of the total number of subcarriers. This paper investigates how to overcome these constraints to allow flexible and fine-grained subcarrier allocation in IFDMA. Specifically, we put forth 1) a bit-reversal subcarrier allocation scheme whereby the problem of allocating evenly-spaced subcarriers is transformed to a more intuitive problem of filling contiguous bins; 2) a multi-stream IFDMA scheme whereby a user can have an arbitrary number of subcarriers. For the synchronous scenario in which user requests arrive in a synchronous manner, we show that IFDMA can achieve the same level of flexibility and granularity as OFDMA in subcarrier allocation. For the asynchronous scenario in which user requests arrive and depart asynchronously, we show that the blocking probability of IFDMA is only slightly worse than that of OFDMA: specifically, the gap between the blocking probabilities of IFDMA and OFDMA is only 2.56% at a moderate offered load.

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Section: Overview Of Our Key Resultsmentioning

confidence: 99%

Section: Overview Of Our Key Resultsmentioning

confidence: 99%

“…The current paper focuses on only the resource allocation issues arising from IFDMA and multi-stream IFDMA. The reader is referred to [20] on how issues a) and b) are addressed.…”

Section: Overview Of Our Key Resultsmentioning

confidence: 99%

Section: Appendix a Digit-reversal Subcarrier Allocation For Composit...mentioning

confidence: 99%

mentioning

confidence: 99%

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Flexible Subcarrier Allocation for Interleaved Frequency Division Multiple Access

Shao,

Liew

2020

Preprint

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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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A New Approach for Improving Performance of Localized SC-FDMA LTE Uplink

Nair

Pillai²

2021

2021 2nd International Conference on Advances in Computing, Communication, Embedded and Secure Systems (ACCESS)

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New Transceiver Designs for Interleaved Frequency-Division Multiple Access

Cited by 8 publications

References 16 publications

Flexible Subcarrier Allocation for Interleaved Frequency Division Multiple Access

Flexible Subcarrier Allocation for Interleaved Frequency Division Multiple Access

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

A New Approach for Improving Performance of Localized SC-FDMA LTE Uplink

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