Time-domain signal combining with cyclic delay and phase shift for PAPR reduction in OFDM systems

2015 IEEE 81st Vehicular Technology Conference (VTC Spring)

2015

In this paper, a peak-to-average power ratio (PAPR) reduction scheme without side information (SI) is propossed. Cyclic-selective mapping (cyclic-SLM) has been applied to reduce the PAPR of a transmit orthogonal frequency division multiplexing (OFDM) signal. The cyclic-SLM generates a signal candidate by combining an original signal and its cyclic shifted signal. The Cyclic SLM requires side information regarding the cyclic shift to recover the signal while it will reduce the throughput of a wireless OFDM system. The propossed scheme applies delayed correlation based estimation to omit the transmision of the SI. In the receiver side, the amount of the cyclic shift is estimated with exploiting the correlation between a guard interval sequence and a received signal. Numerical results show that the cyclic-SLM with the delayed correlation (DC) provides significant PAPR reduction while it realizes the accuracy of the shift estimation close to 100 % at E b /N0 of 8 dB. It also achieves the PAPR that is equivalent to the conventional SLM and the bit error rate degradation is slightly different from that with perfect shift estimation.Index Terms-Peak-to-average power ratio (PAPR), selective mapping (SLM), cyclic-SLM, delayed correlation

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“…The cyclic-SLM process has been proposed to reduce the complexity of LC-SLM [5]. The cyclic-SLM uses a time domain signal combining with cyclic delay and phase shift (TSC-CP).…”

Section: B Cyclic-selective Mappingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

PAPR Reduction Using Cyclic-Selective Mapping with Delayed Correlation in Time Domain

2015 IEEE 81st Vehicular Technology Conference (VTC Spring)

2015

show abstract

“…The cyclic-SLM process has been proposed to reduce the complexity of the LC-SLM [5]. The cyclic-SLM uses a time domain signal combining with a cyclic shift and a phase shift (TSC-CP).…”

Section: B Cyclic-selective Mappingmentioning

confidence: 99%

“…The SLM still demands high computational complexity because it needs multiple inverse fast Fourier transform (IFFT) blocks at a transmitter. Low-complexity SLM (LC-SLM) with two IFFT blocks has also been proposed to overcome this issue [3]- [5]. To reduce the complexity further, a cyclic-SLM scheme has been proposed in [5] which only uses one IFFT and time domain signals with cyclic shifts and phase shifts.…”

Section: Introductionmentioning

confidence: 99%

“…Low-complexity SLM (LC-SLM) with two IFFT blocks has also been proposed to overcome this issue [3]- [5]. To reduce the complexity further, a cyclic-SLM scheme has been proposed in [5] which only uses one IFFT and time domain signals with cyclic shifts and phase shifts. Both of them need side information (SI) to detect the signal in the reciever side.…”

Section: Introductionmentioning

confidence: 99%

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Time domain cyclic-selective mapping for PAPR reduction using delayed correlation with matched filter in OFDM system

2015 22nd International Conference on Telecommunications (ICT)

2015

The cyclic-SLM which implements delayed correlation with a matched filter (DC-MF) is proposed in this paper. The cyclic-SLM reduces a peak-to-average power ratio (PAPR) on an orthogonal frequency divison multiplexing (OFDM) signal. This scheme combines the original OFDM signal and its cyclic shifted ones. However, it needs side information (SI) of the cyclic shifts to recover the original signal that decreases the throughput of a wireless OFDM system. The DC-MF estimates the amount of a shift in a receiver side by multipling a recieved signal with its conjugates of the guard interval (GI) sequence in the time domain . Numerical results obtained through computer simulation show that the cyclic-SLM with the DC-MF significantly reduces the PAPR by around 2.5 dB as compared to the original signal. It also achieves the accuracy rate of the amount of the shift close to 100 % and the BER of 10 −4 at E b /N0 = 8.8 dB that is close to the perfect shift estimation.

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Shift Estimation with Delayed Correlation Cyclic-Selective Mapping (Cyclic-SLM) PAPR Reduction in OFDM System

2016

Wireless Pers Commun