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A modulation classification scheme based on Independent Component Analysis (ICA) in conjunction with proposed for MIMO-OFDM signals over frequency selective, time varying channels. The method is blind in the sense that it is assumed that the receiver has no information about the channel and transmitted signals other than that the spatial streams of signals are statistically independent. The processing...
In this paper, we present design methods to optimize nonlinear phase functions of Generalized DFT (GDFT) for minimized auto and cross correlations. It is shown that GDFT offers sizable correlation improvements over DFT, Walsh, and Gold codes. We conclude the paper with a multiuser communications scenario where correlation optimized GDFT outperforms DFT and other known constant modulus codes in BER...
Constant modulus transforms like discrete Fourier transform (DFT), Walsh transform, and Gold codes have been successfully used over several decades in several engineering applications, including discrete multi-tone (DMT), orthogonal frequency division multiplexing (OFDM) and code division multiple access (CDMA) communications systems. In this paper, we present a generalized framework for DFT called...
Constant amplitude transforms like discrete Fourier transform (DFT), Walsh transform, nonlinear phase Walsh-like transforms and Gold codes have been successfully used in many wire-line and wireless communications technologies including code division multiple access (CDMA), discrete multi-tone (DMT), and orthogonal frequency division multiplexing (OFDM) types. In this paper, we present a generalized...
Continuous phase modulation has been favorably considered for use in DS-CDMA communications due to its constant envelope and spectral efficiency over other competing signaling techniques. On the other hand, more recently proposed multi-level orthogonal spreading code families offer better inter- and intra-code correlation properties than the conventional binary code families like Gold and Walsh. This...
Continuous phase modulation has been favorably considered among other modulation types for use in DS-CDMA communications due to its constant envelope and compact spectrum. The purpose of this paper is two-fold. First, a theoretical framework based BER performance calculation of a DS-CDMA system with CPM modulation is presented. Our simulations validate that analytical methodology. Second, BER performances...
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