NDLI: Constant Envelope OFDM with Channel Coding

Content Provider	IEEE Xplore Digital Library
Author	Ahmed, A.U. Thompson, S.C. Zeidler, J.R.
Copyright Year	2006
Description	Author affiliation: California Univ., San Diego, CA (Ahmed, A.U.; Thompson, S.C.; Zeidler, J.R.)
Abstract	This paper studies the application of convolutional coding to constant envelope orthogonal frequency division multiplexing (CE-OFDM). The noise at the output of the phase demodulator (in the CE-OFDM receiver) is shown to be approximately Gaussian at high SNR and relatively low modulation indices. This allows the use of the conventional metric in the Viterbi decoding algorithm. A bound on the performance of convolutionally coded CE-OFDM is derived and is plotted along side the performance curves obtained through simulation. Both the cases with and without a phase unwrapper are studied. The phase unwrapper results in large bursts of errors at moderate to high modulation indices due to cycle slips. Such burst errors overwhelm the convolutional code and render it useless. Fewer burst errors are generated in the absence of a phase unwrapper. Further adding a simple interleaver is beneficial to counter the burst errors. It is shown that channel coding with interleaving provides good performance for CE-OFDM for low to moderate modulation indices while correcting burst errors due to phase wrapping
Starting Page	1
Ending Page	7
File Size	7639844
Page Count	7
File Format	PDF
ISBN	142440617X
DOI	10.1109/MILCOM.2006.302189
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-10-23
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Channel coding Convolutional codes Phase modulation Gaussian noise Phase noise Demodulation Signal to noise ratio OFDM modulation Viterbi algorithm Decoding
Content Type	Text
Resource Type	Article

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