In-Service BER Based Estimation of OFDM PAPR and CFO-induced Peak Phase Deviation

Lipovac, Adriana; Mihaljević, Ante

doi:10.24138/jcomss.v15i1.614

Cited by 2 publications

(3 citation statements)

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“…Among the drawbacks of the orthogonal frequency-division multiplexing (OFDM) transmission over wireless channel, carrier frequency offset (CFO) and (large) peak-to-average power ratio (PAPR) dominantly degrade the transmission performance, and therefore require utmost attention in the state-of-the-art wireless networks of fourth and fifth generation -4G and 5G, respectively, as well as with 6G to come in the foreseeable future [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

“…With this regard, CFO hinders the carrier frequency synchronization between transmitter and receiver, which degrades mutual orthogonality of OFDM subcarriers, and thus causes inter-carrier interference (ICI) [2][3][4][5]. On the other hand, when the overly high PAPR of the OFDM signal surpasses the dynamic range of the transmitter output high-power output amplifier (HPA), the latter is thus forced into saturation operating regime which causes clipping of peak signal values [6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

“…Various techniques have been proposed for CFO and high-PAPR mitigation [2][3][4][5][6][7][8][9][10][11][12][13], which, for the latter, range from HPA linearization by inserting a digital predistorter (DPD) whose expansion characteristics is inverse to the compression one of the HPA [10], through neural network based approach [13], to peak amplitude clipping of the OFDM signal to be transmitted, as a simple and frequently applied method for PAPR reduction [9], [11].…”

Section: Introductionmentioning

confidence: 99%

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Closed-Form Enhanced Detection of Clipped OFDM Symbol

Lipovac,

Mihaljević,

Lipovac

2024

IEEE Access

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Large peak-to-average power ratio (PAPR) and carrier frequency offset (CFO) are dominant impairments of the orthogonal frequency-division multiplexing (OFDM) symbol transmission that is applied within the state-of-the-art wireless operator networks. In this work, we deal with consequences of the amplitude peak clipping that is commonly used at the transmitter to reduce the PAPR of the OFDM symbol, and thus prevent its non-linear distortion which would otherwise be imposed by the output highpower amplifier (HPA). Accordingly, regardless of the clipping generating mechanism at the transmitter being either inherent (related to the HPA) or deliberate (due to PAPR reduction), the clipped incoming OFDM symbol at the receiver may lead to degraded detection accuracy and transmission performance. However, the methods that have been applied so far at the receiver for compensating non-linear distortion due to clipping, are quite complex and computationally demanding. On the contrary, we propose effective mitigation of the problem to be performed at the receiver, by deriving the closed-form enhanced detection criterion, which requires common measurements of the mean and the rms values, as well as the autocorrelation of the received OFDM symbol comprising both un-clipped and clipped sections. Such improved detection was shown to significantly reduce the side effects of clipping, and restore satisfactory transmission performance -the bit error rate (BER) in particular. The proposed analytical model was preliminarily verified by versatile Monte-Carlo simulations and professional industry-standard vector signal analysis (VSA) test system, as well as by BER testing. The evident convergence of the three methods' test results leads to the conclusion that the proposed clipped OFDM symbol detection method provides clear improvement with respect to the conventional one.

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Section: Introductionmentioning

confidence: 99%