Coding to reduce both PAR and PICR of an OFDM signal

Sathananthan, K.; Tellambura, Chintha

doi:10.1109/lcomm.2002.802065

Cited by 38 publications

(26 citation statements)

References 11 publications

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“…Based on this, it is claimed in [19] that the distribution of the PMEPR can be approximated by Pr PMEPR (20) for large and where . However, (20) cannot be true since it implies that the number of codewords that have a constant PMEPR of (independent of ) is given by (21) which clearly goes to zero as tends to infinity. This contradicts Corollary 1.…”

Section: Codes With Constant Pmeprmentioning

confidence: 99%

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Existence of Codes With Constant PMEPR and Related Design

Sharif

Hassibi

2004

IEEE Trans. Signal Process.

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Abstract-Recently, several coding methods have been proposed to reduce the high peak-to-mean envelope ratio (PMEPR) of multicarrier signals. It has also been shown that with probability one, the PMEPR of any random codeword chosen from a symmetric quadrature amplitude modulation/phase shift keying (QAM/PSK) constellation is log for large , where is the number of subcarriers. Therefore, the question is how much reduction beyond log can one asymptotically achieve with coding, and what is the price in terms of the rate loss? In this paper, by optimally choosing the sign of each subcarrier, we prove the existence of -ary codes of constant PMEPR for sufficiently large and with a rate loss of at most log 2. We also obtain a Varsharmov-Gilbert-type upper bound on the rate of a code, given its minimum Hamming distance with constant PMEPR, for large . Since ours is an existence result, we also study the problem of designing signs for PMEPR reduction. Motivated by a derandomization algorithm suggested by Spencer, we propose a deterministic and efficient algorithm to design signs such that the PMEPR of the resulting codeword is less than log for any , where is a constant independent of . For symmetric -ary constellations, this algorithm constructs a code with rate 1 log 2 and with PMEPR of log with simple encoding and decoding. Simulation results for our algorithm are presented.Index Terms-Coding, multicarrier signals, peak-to-mean envelope power ratio (PMEPR), orthogonal frequency division multiplexing (OFDM).

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Section: Codes With Constant Pmeprmentioning

confidence: 99%

“…We can also consider the joint PMEPR and intercarrier interference (ICI) reduction in OFDM systems that has been recently addressed in [21]. In Section VI-A, we consider the peak to average power ratio (PAPR) in multiple antenna systems employing LD codes [12].…”

Section: Other Applicationsmentioning

confidence: 99%

Existence of Codes With Constant PMEPR and Related Design

Sharif

Hassibi

2004

IEEE Trans. Signal Process.

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“…The most widely known techniques in this category are based on selective mapping [21]- [24], phase shifting [24]- [28], or some form of coding [29]- [33]. Selective mapping and phase shifting offer a considerable reduction of the PAR, but at the price of a significant increase of the overall system complexity.…”

Section: Introductionmentioning

confidence: 99%

Turbo-Coded OFDM Transmission Over a Nonlinear Channel

Nikopour

Khandani

Jamali

2005

IEEE Trans. Veh. Technol.

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In this paper, deliberate level clipping and Turbo-coding are combined to achieve an Orthogonal Frequency Division Multiplexing (OFDM) transmission system with a low Peak-to-Average power Ratio (PAR) and a good performance. Using the linear approximation technique, we first modify the metric computation for the Turbo-decoding in order to consider the distortion effects of the nonlinearity, caused by the Cartesian clipping. The linear approximation of the nonlinear device is based on the Minimum Mean Square Error (MMSE) criterion. By exploiting the linear model, the receiver calculates a modified metric considering the effects of the nonlinearity. Also, this paper introduces a modified Turbo-decoder which simultaneously performs the data estimation and signal reconstruction. In other words, the Turbo-decoder iteratively recovers the clipped signal by using the estimated data, and then improves the data estimation by using the newly recovered signal. Numerical results are presented showing an improvement in the performance of the OFDM transmission system over the nonlinear channel, an increase in the efficiency of the High Power Amplifier (HPA), and/or an expansion of the transmitter coverage area.

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“…It includes selective mapping (SLM) [9], partial transmit sequence (PTS) [10,11], and tone reservation (TR) [12]. The coding algorithm [13] limits the signals that can be used for transmission, only the signals whose peak value is lower than the maximum peak threshold are allowed to be sent. Among these technologies, Active Constellation Extension (ACE) technique is one of most effective methods.…”

mentioning

confidence: 99%

Overlapped Segmental Active Constellation Extension for the PAPR Reduction of the OFDM-OQAM System

Vangala¹,

Anuradha²

2016

IJISA

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Abstract-Orthogonal frequency division multiplexing with Offset Quadrature Amplitude Modulation (OFDM-OQAM) technique has drawn significant interests in recent years. However, most of the existing OFDM peakto-average ratio (PAPR) reduction schemes cannot be used in the OFDM-OQAM system directly. In this paper, a modified scheme called overlapped segmental Active Constellation Extension (OS-ACE) is proposed to deal with the high PAPR problem specifically in the OFDM-OQAM system. For the proposed OS-ACE scheme, the input signals are divided into a number of overlapped segments and then the ACE operation is processed on each segment. Simulation results show that the modified scheme used in the OFDM-OQAM system can provide better performance than conventional ACE scheme directly used in the OFDM-OQAM system, and even outperforms conventional ACE scheme applied in the OFDM system.

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Coding to reduce both PAR and PICR of an OFDM signal

Cited by 38 publications

References 11 publications

Existence of Codes With Constant PMEPR and Related Design

Existence of Codes With Constant PMEPR and Related Design

Turbo-Coded OFDM Transmission Over a Nonlinear Channel

Overlapped Segmental Active Constellation Extension for the PAPR Reduction of the OFDM-OQAM System

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