OFDM Based New Transform with BER Performance Improvement across Multipath Transmission

Ahmed, Mohammed Sh.; Boussakta, S.; Sharif, B.S.; Tsimenidis, Charalampos C.

doi:10.1109/icc.2010.5502327

Cited by 16 publications

(7 citation statements)

References 6 publications

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“…Arranging the samples in the proper order can be achieved by changing the position of the most significant bit from right to left. Similarly, v (1) , v (2) and v (3) can be obtained by applying d (1) ; d (2) and d (3) to sections S 1 ; S 2 and S 2 , respectively. Thus (60) Due to the alignment of the nonzero elements in all the partitions, it is apparent that v (0) and v (1) branches cannot be used to reduce the PAPR because they do not add up with any other non-zero element in other branches.…”

Section: Proposed T-pts-ii Schemementioning

confidence: 99%

“…Thus (60) Due to the alignment of the nonzero elements in all the partitions, it is apparent that v (0) and v (1) branches cannot be used to reduce the PAPR because they do not add up with any other non-zero element in other branches. Moreover, to avoid superposition of samples having the same sign, which may lead to large peak power, multiplying either v (2) or v (3) by phase optimization vector, but not both, is sufficient to minimize the PAPR. Finally, all vectors are combined together to compose the transmitted data sequence,…”

Section: Proposed T-pts-ii Schemementioning

confidence: 99%

“…rate (BER) improvement over single carrier systems. However, as described in [2] and [3], OFDM can be exploited to provide full diversity without spectral losses by using the T-transform, which spreads each data symbol over all subcarriers.…”

mentioning

confidence: 99%

“…The proposed approach adopts the T-transform instead of the IFFT, which leads to PAPR and complexity reduction, as well as BER improvement. The T-transform was developed originally in [40] and used in OFDM to improve the BER over multipath channels, and jointly reduce the PAPR and complexity of the IFFT [2], [3]. Although the T-transform may achieve a noticeable PAPR reduction, the obtained reduction is very far from the PAPR of single carrier systems.…”

mentioning

confidence: 99%

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Efficient Design of Selective Mapping and Partial Transmit Sequence Using T-OFDM

Ahmed

Boussakta

Al-Dweik

et al. 2020

IEEE Trans. Veh. Technol.

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Selective mapping (SLM) and partial transmit sequence (PTS) are attractive schemes for mitigating the high peak power inherent in orthogonal frequency division multiplexing (OFDM) signals. However, the high computational complexity and redundant side information (SI) bits have been identified as the main limitations for such techniques. The high computational complexity is mainly due to the need to perform several inverse fast Fourier transforms (IFFTs), and phase optimization process at the transmitter side. Therefore, this paper presents new SLM and PTS designs using a low complexity T-transform rather than IFFT. The use of the T-transform with SLM achieves a considerable computational complexity and peak-to-average power ratio (PAPR) reduction. Furthermore, we apply the Ttransform to PTS and derive two different configurations that compromise the SI requirements and PAPR reduction. All the proposed schemes do not affect the original power spectrum of OFDM signals. The complexity analysis show that the proposed schemes have much lower complexity as compared to conventional schemes. Moreover, simulation results demonstrate that the proposed schemes are resilient to dispersion arising from multipath propagation, which is due to the frequency diversity introduced by the T-transform.Index Terms-Orthogonal frequency division multiplexing (OFDM), peak-to-average poer ratio (PAPR), selective mapping (SLM), partial transmitted sequence (PTS), T-transform.

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Section: Proposed T-pts-ii Schemementioning

confidence: 99%

Section: Proposed T-pts-ii Schemementioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Efficient Design of Selective Mapping and Partial Transmit Sequence Using T-OFDM

Ahmed

Boussakta

Al-Dweik

et al. 2020

IEEE Trans. Veh. Technol.

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“…For example, the fast algorithms for calculating cascaded WHTs and DFTs are studied in [16]- [19], in which WHTs and DFTs are calculated jointly at a lower complexity than when calculating WHTs and DFTs separately. In [20]- [21], the fast algorithm was applied to the WHT-OFDM system, termed as T-transform, to implement the system more efficiently. In addition, it was shown that the peak-to-average power ratio (PAPR) of the WHT-OFDM signal is improved.…”

Section: Introductionmentioning

confidence: 99%

Low Complexity Discrete Hartley Transform Precoded OFDM System over Frequency-Selective Fading Channel

Ouyang¹,

Jin²,

Jin³

2015

ETRI J

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Orthogonal frequency‐division multiplexing (OFDM) suffers from spectral nulls of frequency‐selective fading channels. Linear precoded (LP‐) OFDM is an effective method that guarantees symbol detectability by spreading the frequency‐domain symbols over the whole spectrum. This paper proposes a computationally efficient and low‐cost implementation for discrete Hartley transform (DHT) precoded OFDM systems. Compared to conventional DHT‐OFDM systems, at the transmitter, both the DHT and the inverse discrete Fourier transform are replaced by a one‐level butterfly structure that involves only one addition per symbol to generate the time‐domain DHT‐OFDM signal. At the receiver, only the DHT is required to recover the distorted signal with a single‐tap equalizer in contrast to both the DHT and the DFT in the conventional DHT‐OFDM. Theoretical analysis of DHT‐OFDM with linear equalizers is presented and confirmed by numerical simulation. It is shown that the proposed DHT‐OFDM system achieves similar performance when compared to other LP‐OFDMs but exhibits a lower implementation complexity and peak‐to‐average power ratio.

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Efficient modulation scheme for OFDM system with ZP and MMSE equalizer

Leftah

Boussakta

2013

2013 IEEE International Conference on Communications (ICC)

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OFDM Based New Transform with BER Performance Improvement across Multipath Transmission

Cited by 16 publications

References 6 publications

Efficient Design of Selective Mapping and Partial Transmit Sequence Using T-OFDM

Efficient Design of Selective Mapping and Partial Transmit Sequence Using T-OFDM

Low Complexity Discrete Hartley Transform Precoded OFDM System over Frequency-Selective Fading Channel

Efficient modulation scheme for OFDM system with ZP and MMSE equalizer

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