ABSTRACT
As explained in Chapter 2, continuous phase modulation (CPM) can be used as a signal transformer to solve the peak-to-average power ratio (PAPR) problem. Using CPM, the high PAPR OFDM (orthogonal frequency division multiplexing) signal is transformed to a constant envelope signal (i.e., 0 dB PAPR). In this chapter, we first study the performance of the CPM-based OFDM (CPM-OFDM) system. Then we propose a CPM-based single-carrier frequency domain equalization (CPM-SC-FDE) structure for broadband wireless communication systems [18,80]. The proposed structure combines the advantages of the low complexity of SC-FDE, in addition to exploiting the channel frequency diversity and the power efficiency of CPM. Both the CPM-OFDM system and the proposed system are implemented with FDE to avoid the complexity of the equalization. Two types of frequency domain equalizers are considered and compared for performance evaluation of both systems; the zero forcing (ZF) equalizer and the minimum mean square error (MMSE) equalizer. Simulation experiments are performed for a variety of multipath fading channels.
