Subcarrier based threshold performance enhancement in Constant Envelope OFDM
Subcarrier based threshold performance enhancement in Constant Envelope OFDM
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DOI：
10.1109/milcom.2012.6415730
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发表时间：
2012-10
期刊：
影响因子：
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通讯作者：
Ahsen U. Ahmed;Steve C. Thompson;D. Chi;J. Zeidler
中科院分区：
文献类型：
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作者：
Ahsen U. Ahmed;Steve C. Thompson;D. Chi;J. Zeidler
恒包络OFDM （CE-OFDM）解决了OFDM中峰值平均功率比（PAPR）高的主要问题。然而，由于CE-OFDM是基于角度调制的，它受到众所周知的阈值效应的影响，在低载波噪声比（CNRs）下会导致性能下降。本文研究了阈值效应引起的相位周跳对CE-OFDM中底层相位调制OFDM子载波的影响。我们研究了基于子载波的信噪比（SNR）和误码率（BER）性能，并表明由于阈值效应导致的性能下降在低频子载波上更为显著。最后，我们开发了一种基于低复杂度子载波的技术来减轻相位周跳的影响，从而显著提高性能。
Constant Envelope OFDM (CE-OFDM) addresses the major issue of a high peak-to-average power ratio (PAPR) in OFDM. However, since CE-OFDM is based on angle modulation, it suffers from the well known threshold effect which results in a large performance degradation at low carrier-to-noise ratios (CNRs). In this paper, we study the impact of the threshold effect induced phase cycle slips on the underlying phase modulated OFDM subcarriers in CE-OFDM. We study both the signal-to-noise ratio (SNR) as well as the bit error rate (BER) performance on a subcarrier basis and show that the performance degradation due to the threshold effect is much more significant at lower frequency subcarriers. Finally we develop a low complexity subcarrier based technique to mitigate the effect of the phase cycle slips for significant performance improvement.