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An improved MSK‐BCS modulation for global navigation satellite systems in C band
Author(s) -
Liu Meihong,
Zhan Xingqun,
Li Wei,
Jing Shuai,
Chen Maolin
Publication year - 2016
Publication title -
ieej transactions on electrical and electronic engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.254
H-Index - 30
eISSN - 1931-4981
pISSN - 1931-4973
DOI - 10.1002/tee.22264
Subject(s) - multipath mitigation , binary offset carrier modulation , multipath propagation , gnss applications , electronic engineering , waveform , direct sequence spread spectrum , telecommunications , autocorrelation , computer science , spread spectrum , chip , minimum shift keying , bandwidth (computing) , physics , electrical engineering , phase shift keying , mathematics , engineering , bit error rate , frequency modulation , amplitude modulation , global positioning system , code division multiple access , channel (broadcasting) , statistics , radar
Because of the congestion of current navigation signals in the L band, the frequency band between 5010 and 5030 MHz allocated as C band with smaller ionospheric errors can be taken as a candidate band for global navigation satellite system (GNSS). The main objective of C band signal design is to achieve band limitation, compatibility, multipath resistance, satisfactory tracking, and acquisition performance. The minimum shift keying (MSK) chip waveform has been proven to be effective in providing better spectrum confinement and a constant envelope. However, the MSK chip waveform with an arbitrary binary coded symbol (BCS) may not meet the requirements of the C band. Thus, the BCS sequence ([ s 0 , s 1 ,⋯ , s n − 1 ], f c ) = ([1,1,1,1,−1,−1,1,−1,1,−1],1) is obtained by means of a thorough computer search for low autocorrelation side lobes based on a Neuman–Hofman code of length 10 with MSK pulses form MSK‐BCS ([1,1,1,1,−1,−1,1,−1,1,−1],1). It is proved to have better autocorrelation with a sharp main lobe and smaller side lobes, larger Gabor bandwidth, smaller Cramér–Rao lower bound, and less multipath error; more importantly, it can satisfy the threshold of leakage out of band. It will be of great significance for signal design in C band. © 2016 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.