Code hopping communications with real-valued direct sequences for anti-interception

Using real-valued sequences, a new kind of Code Hopping Code Division Multiple Access (CH-CDMA) communication systems is proposed for anti-interception in this paper. With the same sequence period, the real-valued sequence sets are much more than the traditional integer sequence sets, so the codes for hopping are no longer deficient seriously as before, which improves the performance of anti-interception. Moreover, using real-valued sequences with Quasi-Zero Correlation Zone (QZCZ) may eliminate perfectly the InterSymbol Interference (ISI) and Multi-Access Interference (MAI) so as to overcome the far-near effect and improve the performance of anti-interference, which makes it convenient to build big-area networks on the war field.