On the Inclusion and Utilization of Pilot Tones in Unique Word OFDM

Hofbauer, Christian; Haselmayr, Werner; Bernhard, Hans-Peter; Huemer, Mario

doi:10.1109/tsp.2020.3025730

Cited by 13 publications

(20 citation statements)

References 35 publications

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“…In UW-based frames, the cyclic prefix (CP)-that has a random nature-has been replaced by a deterministic sequence. Hence, the UW not only provides circular channel condition for the OFDM symbol, but also allows per-symbol synchronization and channel estimation [10], [11].…”

Section: Introductionmentioning

confidence: 99%

Performance Comparison of IEEE 802.11p, 802.11bd-draft and a Unique-Word-based PHY in Doubly-Dispersive Channels

Ehsanfar

Moessner

Gizzini

et al. 2022

2022 IEEE Wireless Communications and Networking Conference (WCNC)

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In this paper, we evaluate and make a comparison of the channel estimation performance for three different frame structures of IEEE 802.11p, IEEE 802.11bd-draft and a unique-word (UW)-based physical layer (PHY). As in vehicle-toeverything communication the wireless channel conditions may vary significantly depending on the environment and vehicle velocity, severe fading in both time and frequency domains may occur. Through simulation results, we show that the UWbased PHY achieves an interference-free performance of channel estimation via a low complexity technique, whereas the 802.11bd would need to employ a high complexity approach in order to achieve a comparable estimation performance.

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Section: Introductionmentioning

confidence: 99%

Performance Comparison of IEEE 802.11p, 802.11bd-draft and a Unique-Word-based PHY in Doubly-Dispersive Channels

Ehsanfar

Moessner

Gizzini

et al. 2022

2022 IEEE Wireless Communications and Networking Conference (WCNC)

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“…OFDM variants are broadly classified into cyclic prefix (CP) OFDM, known symbol padding (KSP) OFDM [ 8 , 9 , 10 , 11 ], zero padding (ZP) OFDM [ 12 , 13 ], and unique word (UW) OFDM [ 14 , 15 ]. They all have been the focus of investigation among researchers for the last couple of decades.…”

Section: Introductionmentioning

confidence: 99%

BER Reduction and Capacity Enhancement with Novel Guard Sequence Selection for Multi-Carrier Communication

Ologun

Shah

et al. 2022

Sensors

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Orthogonal frequency division multiplexing (OFDM) is an efficient multicarrier scheme that uses different types of guard intervals such as cyclic prefix (CP) and known symbol padding (KSP) (zero padding (ZP), unique word (UW), etc.) in block formation. Among these guard intervals, CP varies for each block, while other guard intervals remain fixed from block to block. These guard intervals efficiently perform channel estimation, synchronization and remove inter-block interference (IBI); nevertheless, none of the existing schemes develop any relationship between the guard interval (sequence) and the data symbols on different subcarriers of the OFDM block. We present a new idea of selecting the guard interval based on the data symbols of a subset of subcarriers in the block and exploit the high auto-correlation of the selected guard sequence to improve the bit error rate (BER) performance of the system. The results based on a fair comparison show that our enhanced orthogonal frequency division multiplexing (eOFDM) scheme inherits significant improvements in BER and the capacity of a multicarrier system as compared to the existing techniques.

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“…The UW provides the same advantages as a CP: it makes the diagonalization of the channel matrix possible by the discrete Fourier transform (DFT) and circumvents intersymbol interference. On the other hand, as the UW is known, it can be used to estimate the channel or synchronize the signal [2]- [4]. Furthermore, in distinction to CP-OFDM, the UW is already part of the DFT interval.…”

Section: Introductionmentioning

confidence: 99%

Precoding for PAPR Reduction in UW-OFDM

Rajabzadeh

Steendam

2021

IEEE Commun. Lett.

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Unique Word Orthogonal Frequency Division multiplexing (UW-OFDM) is a variant of the multicarrier technique that has shown better bit error performance compared to cyclic prefixed (CP-)OFDM. Like other multicarrier techniques, UW-OFDM suffers from the high peak-to-average-power ratio (PAPR) problem, which is an obstacle ahead of practical implementation of UW-OFDM. In this letter, the generator matrix, which is inherent to UW-OFDM, is not only used to create the specific UW-OFDM system, but also to reduce the PAPR. To do so, a suitable optimization problem is developed, and solved using the Procrustes method. The main advantage of the proposed method is that the built-in generator matrix should be calculated only once for each system setting, and the PAPR reduction (PAPR-R) is achieved without any overhead redundancy. Simulation results are provided for evaluating the PAPR-R performance of the proposed method.

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On the Inclusion and Utilization of Pilot Tones in Unique Word OFDM

Cited by 13 publications

References 35 publications

Performance Comparison of IEEE 802.11p, 802.11bd-draft and a Unique-Word-based PHY in Doubly-Dispersive Channels

Performance Comparison of IEEE 802.11p, 802.11bd-draft and a Unique-Word-based PHY in Doubly-Dispersive Channels

BER Reduction and Capacity Enhancement with Novel Guard Sequence Selection for Multi-Carrier Communication

Precoding for PAPR Reduction in UW-OFDM

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