Determining and Shaping GNSS Symbol PSDs for Effective Spectrum Reuse

D. Benson

Abstract:	As additional Global Navigation Satellite Systems (GNSS) become deployed and additional signals are placed into existing frequency allocations efficient use of the spectrum becomes more critical. Effective design of these signals depends upon the understanding and the ease of calculation for the power spectral densities (PSD) of the signals. This paper shows a very easy method to calculate the PSDs based also on a simple method to determine the autocorrelation functions (ACF). Also discussed are all the possible binary code symbols that can be generated from an m-equal-length binary code symbol sequence. In addition, previous methods assume that the code symbol transitions occur at integer divisions of the code length whereas in the methods discussed here the code symbol transitions can occur at any point within the code length. Time division multiplexing various code symbols as suggested in a recent paper can achieve further spectral shaping. This paper extends their idea by discussing possible benefits of alternatives as to how the multiplexing should be done. For example, if one code symbol is time multiplexed with another code symbol this could be done by alternating code symbols or it could be done by, for example, transmitting 10 of one code symbol followed by 10 of the other code symbol.
Published in:	Proceedings of the 2006 National Technical Meeting of The Institute of Navigation January 18 - 20, 2006 Hyatt Regency Hotel Monterey, CA
Pages:	92 - 99
Cite this article:	Benson, D., "Determining and Shaping GNSS Symbol PSDs for Effective Spectrum Reuse," Proceedings of the 2006 National Technical Meeting of The Institute of Navigation, Monterey, CA, January 2006, pp. 92-99.
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