Serially concatenated continuous phase modulation for satellite communications
IEEE Transactions on Wireless Communications
Spectrally-efficient continuous phase modulations
IEEE Transactions on Wireless Communications
Time-frequency packing for linear modulations: spectral efficiency and practical detection schemes
IEEE Transactions on Communications
Factor graphs and the sum-product algorithm
IEEE Transactions on Information Theory
Iterative multiuser joint decoding: unified framework and asymptotic analysis
IEEE Transactions on Information Theory
Iterative multiuser detection for coded CDMA signals in AWGN and fading channels
IEEE Journal on Selected Areas in Communications
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We consider a frequency division multiplexed (FDM) satellite system where each user employs a continuous phase modulation (CPM), serially concatenated with an outer code through an interleaver, and iterative detection/decoding. In such a system, the spectral efficiency can be increased by reducing the spacing between two adjacent channels, thus increasing the relevant interference. Hence, we address the design of low-complexity suboptimal multiuser detectors able to effectively cope with such an interference. We extend some well known multiuser detection algorithms proposed for code division multiple access (CDMA) systems. Moreover, we introduce a new detection scheme using the framework based on factor graphs (FGs) and the sum-product algorithm (SPA). The simulation results show that the described algorithms allow to effectively reduce the spacing, thus increasing the spectral efficiency, and in particular, the proposed detection scheme results to be the most effective one in terms of performance and computational complexity.