A method to reduce the probability of clipping in DMT-based transceivers

Mestdagh, D.; Spruyt, P.

doi:10.1109/26.539761

Cited by 105 publications

(51 citation statements)

References 7 publications

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“…where * denotes the circular convolution, ((n) N ) denotes n modulo N and R n is the rectangular sequence which is elements are selected out and put in a sequence set Q from which to choose M sequences to build M OFDM candidate signals according to (11). Hence, the IP-PTS for real-valued OFDM signals can be written as,…”

Section: Ip-pts For Real-valued Ofdm Systemsmentioning

confidence: 99%

“…Most of the existing methods, e.g., selected mapping (SLM) [5], [6], partial transmit sequences (PTS) [7], [8], [9], that have been developed until now are based on complexvalued OFDM systems. For real-valued OFDM systems, a few methods for PAPR reduction have also been proposed, such as amplitude clipping and filtering [1], [10], a SLM-like method [11], tone reservation [1], [12], etc. Tone reservation method is thought of as to be well suited for DMT ADSL over twisted pair copper because there are several subcarriers which have too low SNR for sending any information and are available for PAPR reduction.…”

Section: Introductionmentioning

confidence: 99%

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PAPR reduction for real baseband OFDM signals

Wu²,

Carlemalm-Logothetis³

2006

2006 8th International Conference on Signal Processing

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Abstract： Application of partial transmit sequences (PTS) method for the reduction of peak-to-average power ratio (PAPR) in real-valued OFDM systems is considered in this paper. When directly applying the existing PTS schemes (established based on complex-valued systems) to realvalued systems, one may encounter a difficulty in constructing phase sequences sets that are used to generate the candidates to be chosen for transmission. To overcome the difficulty, the approaches are proposed for two PTS schemes, the adjacent partition (AP-PTS) and the interleaved partition (IP-PTS), to be able to apply to real-valued systems. For the AP-PTS, the difficulty, i.e., the requirement of conjugate symmetry on the phase sequences, is circumvented by re-arranging the data sequence. For the IP-PTS, direct constructing phase sequences sets is avoided; instead the real-valued time domain sequences sets are constructed that correspond to the IDFT of the phase sequences sets, and then used to directly generate the real-valued OFDM candidate signals in the time domain. A distinct feature of the IP-PTS is that only one IDFT is necessary to generate the candidate OFDM signals. Simulations are carried out to evaluate the performance of the AP-PTS and IP-PTS schemes. The results show that both schemes can effectively reduce the PAPR of a real-valued OFDM system.

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Section: Ip-pts For Real-valued Ofdm Systemsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

PAPR reduction for real baseband OFDM signals

Wu²,

Carlemalm-Logothetis³

2006

2006 8th International Conference on Signal Processing

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“…To deal with the high PAPR a number of approaches have been proposed. such as clipping [19] tone reservation ,and Selected mapping(SLM) All of the mentioned schemes need an accurate PAPR calculation based on over sampling.…”

Section: Introductionmentioning

confidence: 99%

PAPR Reduction in OFDM Via Separation of Complex Baseband Signal

Gupta¹,

Mishra²,

Nema³

2011

IJCA

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OFDM system is the stronger base for the future wir eless c o m m u n i c a t i o n . The one w i t h the lowest peak to average power ratio (PAPR) among these OFDM signal sequences are selected for transmission. One major Disadvantage of OFDM is the high peak-to-average Power ratio (PAPR). One investigated technique Selected Mapping (SLM) is PAPR reduction techniques for Orthogonal Frequency Division Multiplexing (OFDM). By analyzing separation of complex baseband signal in this paper we proposed a Modernize SLM algorithm (MSLM) scheme to reduce the PAPR by using the complex signal to separate into real & imaginary parts and use as a individually phase sequence multiply real part as well as imaginary part of complex signal. Finally select the minimum PAPR signal which is achieved by real & imaginary part and then combine both of the approach and find one of the lowest peak to average power ratio among these OFDM signal sequences for transmission. After applying different simulation on the MATLAB software it produces less complexity and improved performance.

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“…This expectation value is the value that we expect to measure most often if repeated measurements were made on the system. The PAPR also can be expressed in dB as in equation (2).…”

Section: Peak To Average Power Ratio (Papr)mentioning

confidence: 99%

“…For example, selective mapping or transformation [1], [2] may statistically reduce the PAPR with a relatively simple implementation cost.…”

Section: Fig 1 Basic Principle Of Ofdm Systemmentioning

confidence: 99%