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OFDM-CPM Performance and FOBP under IEEE802.16 Scenario

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Author(s): Alimohammad Montazeri

Journal: Signal Processing : An International Journal
ISSN 1985-2339

Volume: 3;
Issue: 4;
Start page: 64;
Date: 2009;
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Keywords: OFDM-CPM | PAPR | SUI Multipath Channel Model | IEEE802.16 | Fractional out of band power (FOBP).

ABSTRACT
The application of Orthogonal frequency domain modulation-Continuous Phase Modulation (OFDM-CPM) in multipath Stanford University Interim (SUI) channels is presented in this paper. OFDM-CPM is proposed for IEEE 802.16 standards as an alternative technique of orthogonal frequency division multiplexing (OFDM) in physical layer. It is shown that, in addition to 0dB Peak to Average Power Ratio (PAPR) and power efficiency, un-coded OFDM-CPM exploits the frequency diversity of multipath channel. Taking into account the Input Power Back off (IBO), OFDM-CPM is shown to outperform OFDM at high bit energy-to-noise density ratios (Eb/N0). However, at low Signal to Noise Ratio (SNR), the OFDM-CPM phase demodulator receiver suffers from a threshold effect. In addition, this paper compares the spectral fractional out of band power of OFDM-CPM for different modulation indices.
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