| Huang Xinlin(黄新林),Wang Gang,Liao Quanrui,Sun Qingquan.[J].高技术通讯(英文),2011,17(1):25~31 |
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| A novel Haar wavelet-based precoded BPSK-OFDM system with reduced PAPR |
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| DOI： |
| 中文关键词: |
| 英文关键词: peak-to-average power ratio (PAPR), Haar wavelet, BPSK, precoded OFDM. |
| 基金项目: |
| Author Name | Affiliation | | Huang Xinlin(黄新林) | | | Wang Gang | | | Liao Quanrui | | | Sun Qingquan | |
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| 中文摘要: |
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| 英文摘要: |
| The performance of OFDM systems may be degraded when intersymbol interference (ISI) channels have spectral nulls. Recently, the precoded OFDM was proposed to combat this problem. However, due to inserting (M-K) zeros between each two sets of K consecutive information symbols, the average transmitting power of the precoded OFDM system reduces by 10log10(M/K) dB compared with the conventional OFDM system. Under the same points inverse fast Fourier transformation (IFFT), the precoded OFDM system has a higher peak-to-average power ratio (PAPR) compared with the conventional OFDM system. This paper proposes a novel precoded BPSK-OFDM system based on Haar wavelet transformation. The Haar wavelet transformation operating decomposition over the vector information symbols produced by a precoder shows that half of the information symbols are zeros and the rest are either 2 or -2. Then, we have the peak power and PAPR reduced by 10log102≈3dB at most compared with the precoded OFDM system. Finally, we compare PAPR of the proposed OFDM system with the precoded OFDM and the conventional OFDM system. |
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