Computation of the continuous-time PAR of an OFDM signal with BPSK subcarriers

Tellambura, Chintha

doi:10.1109/4234.922754

Cited by 342 publications

(137 citation statements)

References 6 publications

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“…It is shown in [19] that β = 4 can provide sufficiently accurate PAPR results. The PAPR computed from the β-times oversampled time domain sequence p βN is given by…”

Section: Peak-to-average Power Ratio Reductionmentioning

confidence: 99%

Frequency Offset Estimation for OFDM Systems with a Novel Frequency Domain Training Sequence

Jiang¹

2006

IEICE Transactions on Communications

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SUMMARY A novel frequency domain training sequence and the corresponding carrier frequency offset (CFO) estimator are proposed for orthogonal frequency division multiplexing (OFDM) systems over frequency-selective fading channels. The proposed frequency domain training sequence comprises two types of pilot tones, namely distinctively spaced pilot tones with high energies and uniformly spaced ones with low energies. Based on the distinctively spaced pilot tones, integer CFO estimation is accomplished. After the subcarriers occupied by the distinctively spaced pilot tones and their adjacent subcarriers are nulled for the sake of interference cancellation, fractional CFO estimation is executed according to the uniformly spaced pilot tones. By exploiting a predefined lookup table making the best of the structure of the distinctively spaced pilot tones, computational complexity of the proposed CFO estimator can be decreased considerably. With the aid of the uniformly spaced pilot tones generated from Chu sequence with cyclically orthogonal property, the ability of the proposed estimator to combat multipath effect is enhanced to a great extent. Simulation results illustrate the good performance of the proposed CFO estimator.

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“…It is shown in [19] that β = 4 can provide sufficiently accurate PAPR results. The PAPR computed from the β-times oversampled time domain sequence p βN is given by…”

Section: Peak-to-average Power Ratio Reductionmentioning

confidence: 99%

Frequency Offset Estimation for OFDM Systems with a Novel Frequency Domain Training Sequence

Jiang¹

2006

IEICE Transactions on Communications

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“…This approximation practise was correspondingly used in literature [10]. In this paper, M-QAM signals were not considered because Equation 12 cannot be used for the M-QAM constellations, as stated in [11, 12, 13, 14, 15, and 16] and as proven in [17,18,19]. The upper limits for M-QAM are given in the literatures [20,21] …”

Section: The Proposed Methodsmentioning

confidence: 99%

PAPR Reduction of OFDM Systems using 2D Inverse Discrete Fourier Transform

Hassoon¹,

Ruhaima²,

Alghrairi³

2017

IJCA

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A tow-dimensional (2D) orthogonal frequency division multiplexing (OFDM) system with peak-to-average power ratio (PAPR), a multicarrier system, is an important part of wireless communications engineering. Since these signals divide the bandwidth into other sub channels n, so the OFDM signals accomplish top data rates. Although, High peak-toaverage power ratio (PAPR) of the transmit signal is a major problem of multicarrier transmission such as orthogonal frequency division multiplexing (OFDM). To make fewer the PAPR values, There are many of techniques have been introduced, including selected mapping and amplitude clipping. The method that produces the least bit-error rate (BER) performance, its method is Amplitude clipping and filtering which is the simplest method. And from the other side, SLM although it presents a computational complexity, it is considered the most suitable and distortion less. In this research, a new technique is proposed based on twodimensional discrete Fourier transform (2D-DFT). In this paper we present a new method that reduces the computational complexities and distortion less compared to the SLM method. The M-PSK mapping types show from theoretical analysis that the PAPR can be reduced to something like 0.0 dB, as proven mathematically and by computer simulations.

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“…By sampling ( ) defined in (3) at frequency = / , where is the oversampling factor, the discrete-time LDS-OFDM symbol can be written as; It is shown in [10] that = 4 can provide adequately precise PAPR results. The PAPR calculated from the times oversampled time domain signal's samples is given by;…”

Section: Papr Of Lds-ofdmmentioning

confidence: 99%