Approaching the Matched Filter Bound with Unique Word OFDM

Haselmayr, Werner; Hofbauer, Christian; Huemer, Mario; Springer, Andreas

doi:10.1109/icc.2019.8761639

Cited by 5 publications

(5 citation statements)

References 13 publications

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“…The assumption of a Gaussian distribution for w seems justified, given that v ∼ CN (0, N σ 2 n I), cf. (17), and considering the law of large numbers in case of ∆ k , cf. (25).…”

Section: Appendix a Derivation Of Signaling Model For Llr Calculationmentioning

confidence: 99%

“…The introduction of the unique word within the discrete Fourier transform (DFT) interval requires the introduction of redundancy in the frequency domain. This redundancy can advantageously be utilized to provide several beneficial properties, such as superior spectral shaping characteristics [2], [3], [4], [5], [6] or outstanding bit error ratio (BER) performance for linear [7], [8], [2], [9], [10], [11], non-linear [12], [13], [14], [15] as well as iterative [16], [17] receivers 1 .…”

Section: Introductionmentioning

confidence: 99%

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Impact of a Carrier Frequency Offset on Unique Word OFDM

Hofbauer

Haselmayr

Bernhard

et al. 2020

2020 IEEE 31st Annual International Symposium on Personal, Indoor and Mobile Radio Communications

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Word-orthogonal frequency division multiplexing (UW-OFDM) is known to provide various performance benefits over conventional cyclic prefix (CP) based OFDM. Most important, UW-OFDM features excellent spectral sidelobe suppression properties and an outstanding bit error ratio (BER) performance. Carrier frequency offset (CFO) induced impairments denote a challenging task for OFDM systems of any kind. In this work we investigate the CFO effects on UW-OFDM and compare it to conventional multi-carrier and single-carrier systems. Different CFO compensation approaches with different computational complexity are considered throughout this work and assessed against each other. A mean squared error analysis carried out after data estimation reveals a significant higher robustness of UW-OFDM over CP-OFDM against CFO effects. Additionally, the conducted BER simulations generally support this conclusion for various scenarios, ranging from uncoded to coded transmission in a frequency selective environment.

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“…The assumption of a Gaussian distribution for w seems justified, given that v ∼ CN (0, N σ 2 n I), cf. (17), and considering the law of large numbers in case of ∆ k , cf. (25).…”

Section: Appendix a Derivation Of Signaling Model For Llr Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Impact of a Carrier Frequency Offset on Unique Word OFDM

Hofbauer

Haselmayr

Bernhard

et al. 2020

2020 IEEE 31st Annual International Symposium on Personal, Indoor and Mobile Radio Communications

Self Cite

View full text Add to dashboard Cite

show abstract

“…The two different factors influencing the resulting energy of the pilots are the positions of the pilot subcarriers determined by P p within G p , and the values of the pilot symbols p. Since it has been shown in [35] that a uniform distribution of the pilot subcarriers over the available bandwidth is beneficial, we fix the position of the pilots accordingly. Hence, the positions are not available as a degree of freedom to minimize (16). In other words, the design of G p is fixed and there is no possibility left for optimization of the generator matrix, leaving the values of the pilot symbols p as only optimization parameters.…”

Section: B Optimization Of Pilot Dependent Termmentioning

confidence: 99%

“…The introduction of the unique word within the discrete Fourier transform (DFT) interval requires the introduction of redundancy in the frequency domain. This redundancy can advantageously be utilized to provide several beneficial properties, such as superior spectral shaping characteristics [2], [3], [4], [5], [6] or outstanding bit error ratio (BER) performance for linear [7], [8], [2], [9], [10], [11], non-linear [12], [13], [14] as well as iterative [15], [16] receivers 1 .…”

Section: Introductionmentioning

confidence: 99%

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

Hofbauer,

Haselmayr,

Bernhard

et al. 2020

Preprint

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Unique word-orthogonal frequency division multiplexing (UW-OFDM) is known to provide various performance benefits over conventional OFDM using cyclic prefixes (CP). Most important, UW-OFDM features excellent spectral sidelobe suppression properties and an outstanding bit error ratio performance. Current research has mainly focused on principle performance bounds of UW-OFDM, with less attention on challenges aside from idealized communication scenarios, such as system parameter estimation tasks. In this work we present an approach for including frequency pilots tones into the UW-OFDM signaling scheme, which can then be utilized for these estimation tasks. Suitable optimization criteria are presented and interactions of pilots with data symbols are highlighted. Pilot tone based estimation of a carrier frequency offset (CFO) is conducted as an estimation example, revealing considerable differences to conventional OFDM. Simulation results in a multipath environment demonstrate a significantly increased estimation accuracy in UW-OFDM over CP-OFDM, which becomes even more dominant with an increasing CFO. This performance difference is due to the inherent redundancy present in an UW-OFDM signal.

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