High Performance and Low Complexity Equalization Techniques by Multi-H CPM

Continuous phase modulations (CPM) represent a family of non-linear coded modulation schemes characterize by a constant envelope and continuity of the phase. The constant envelopes permit the use of very efficient non-linear power amplifiers in the transmitter, while level phase variations result in a compact spectrum. These modulations are classified as single-h CPM schemes and have been used in a variety of standards, such as GSM, Bluetooth etc. Frequencydomain equalization offers low-complexity, as compared to both the best greatest chances sequence detection and the time-domain equalizer, for a channel with large delay spread. The objective of our explore is to expand FDE techniques for multi-h CPM waveforms. Two FDE receiver architectures are planned for multi-h CPM; one that uses a MF front end and the other that uses a single low-pass filter follow by a sampler For both schemes, show that the sampled output of the receiver filter(s) satisfies a circulate matrix model for general mulit-h CPM waveforms given that the transmitted signal is cyclic for the duration of the block. Similarly, convolution drop can be obtained for variety based (SF-based) approach by truncate the auto-correlation matrix of the multi-h CPM signal. Imitation results are presented for the IRIG-106 Tier-2 dual-h CPM waveform.