Abstract
The performance of multiuser systems employing coded continuous- phase modulation (CPM) in frequency-division multiplexed (FDM) uplink satellite communications is investigated. The spectral efficiency is improved reducing the inter-carrier frequency spacing. Since severe inter-channel interference (ICI) occurs in such cases, a simple iterative ICI cancellation algorithm is applied in conjunction with a bank of single-user (SU) receivers to perform demodulation and decoding. When modulation and coding parameters are suitably chosen, such a receiver achieves a performance close to the non-interfering multiuser case. ICI causes further degradation since the SU receivers are not perfectly matched to the received signal model. Moreover, the SU receivers require a perfect knowledge of the channel state information (CSI) in order to perform optimal demodulation in additive white Gaussian noise. To reduce the degradation caused by ICI, a new heuristic method for estimating the optimal CSI values to provide to the SU receiver is proposed. The proposed method is based on an approximation of the CSI vector provided to each SU receiver. Such a method proves useful since it leads to significant performance improvements of the considered schemes and exhibits a negligible complexity.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
