Modified CEMIC Scheme for Multiplexing Signals over Single Frequency Band

Vijay Singh Bhadouria, Dhaval J. Upadhyay, Parimal J. Majithiya, Subhash Chandra Bera

Abstract:	The paper presents modified Constant Envelope Multiplexing using Intermodulation Construction (CEMIC) scheme to generate constant envelope waveform for multiplexing multiple signals over signal frequency band. Constant envelope signal is required to operate the transponder in saturation with maximum efficiency. The modified CEMIC scheme is proposed to include an additional signal in the present existing navigation system. Novel custom made constraints are fused to minimize changes required in the existing navigation on-board system and different types of receivers. The proposed scheme optimizes power sharing of desired signals based on system requirements while maximizing multiplexing efficiency. The proposed scheme controls the power sharing and phasing of individual inter-modulation constituent signal, generated due to multiplexing process, to minimize intrasystem and intersystem interference. The proposed scheme provides better flexibility in frequency coordination with GNSS service providers. The paper presents various power sharing and phasing options of desired signals to generate composite constant envelope waveform using proposed scheme. Hardware performance of signal generated using the proposed scheme is also presented in the paper.
Published in:	Proceedings of the 34th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS+ 2021) September 20 - 24, 2021 Union Station Hotel St. Louis, Missouri
Pages:	1884 - 1902
Cite this article:	Updated citation: Published in NAVIGATION: Journal of the Institute of Navigation
Presentation Slides:	ION Members/Non-Members: 1 Download Credit Sign In