Power Spectral Analysis of UW-OFDM Systems

Rajabzadeh, Morteza; Steendam, Heidi

doi:10.1109/tcomm.2017.2728058

Cited by 15 publications

(11 citation statements)

References 25 publications

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“…Similar to most of the works on UW-OFDM, e.g. [1], [6] and [7], we consider the system parameters N = 64, N d = 36, N z = 12 and N r = N u = 16, unless stated otherwise. The complete set of system parameters can be found in [6,Table I].…”

Section: Simulation Resultsmentioning

confidence: 99%

“…To make the insertion of the UW possible, a TD data block is generated that contains zeros at the positions of the UW by adding redundancy in the frequency domain using a generator matrix. This redundancy results in several advantageous properties such as inherent diversity gain resulting in outstanding bit error rate (BER) performance [5], and lower out-of-band radiation (OOBR) than for CP-OFDM [6]. Yet, these advantageous properties come at some cost: to fully exploit the introduced diversity gain, UW-OFDM needs more sophisticated data detectors compared to conventional CP-OFDM [1], [7].…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Simulation Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Precoding for PAPR Reduction in UW-OFDM

Rajabzadeh

Steendam

2021

IEEE Commun. Lett.

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“…where 0 U is a zero matrix with size U × U. By replacing (7) into (6), we have z n 0 = d n 0 , which means that the desired symbols are obtained without any interference. Furthermore, if the channel is not ideal, but it can be assumed flat and time invariant through overlapped adjacent time instants and subcarriers, by using a simple one-tap equaliser before despreading, the channel effect can be properly eliminated.…”

Section: Spread-ofdm/oqam System Modelmentioning

confidence: 99%

“…Firstly, the large spectral side lobes in the OFDM signal lead to a poor performance in time variant channels or channels with large Doppler shift [4][5][6]. Furthermore, a cyclic prefix (CP) is appended to each OFDM block to prevent the inter-block-interference, which reduces the bandwidth efficiency [4][5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…OFDM/offset quadrature amplitude modulation(OQAM) is an alternative multicarrier technique, which by using a well-localised prototype filter, shapes the transmitted symbol blocks [8,9], and can overcome the mentioned drawbacks of OFDM [4][5][6][7][8][9]. However, OFDM/OQAM suffers from an inherent interference, which appears even in distortion-free channels.…”

Section: Introductionmentioning

confidence: 99%

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