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Low-Complexity Linear Frequency Domain Equalization for Continuous Phase Modulation
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DOI：10.1109/TWC.2009.080146.png)
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Abstract
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In this paper, we develop a new low-complexity linear frequency domain equalization (FDE) approach for continuous phase modulated (CPM) signals. As a CPM signal is highly correlated, calculating a linear minimum mean square error (MMSE) channel equalizer requires the inversion of a nondiagonal matrix, even in the frequency domain. hi order to regain the FDE advantage of reduced computational complexity, we show that this matrix can be approximated by a block-diagonal matrix without performance loss. Moreover, our MMSE equalizer can he simplified to a low-complexity zero-forcing equalizer. The proposed techniques can he applied to any CPM scheme. To support this theory we present a new polyphase matrix model, valid for any block-based CPM system. Simulation results in it 60 GHz environment show that our reduced-complexity MMSE equalizer significantly outperforms the state or the art linear MMSE receiver for large modulation indices, while it performs only slightly worse for small ones.
Keywords:
Continuous phase modulation (CPM)
frequency domain equalization (FDE)
minimum mean square error (MMSE) equalization
complexity reduction
polyphase representation
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