@article{oai:niigata-u.repo.nii.ac.jp:00001905,
 author = {Sasaki, Shigenobu and Kikuchi, Hisakazu and Zhu, Jinkang and Marubayashi, Gen},
 issue = {7},
 journal = {IEICE transactions on fundamentals of electronics, communications and computer sciences, IEICE transactions on fundamentals of electronics, communications and computer sciences},
 month = {Jul},
 note = {This paper investigates the error rate performance of parallel combinatorial spread spectrum (PC/SS) communication systems that use coherent and differential multiphase modulation: multiphase parallel combinatorial spread spectrum (MPC/SS) communication systems. The PC/SS systems are multicode SS systems based on orthogonal pseudo-noise (PN) sequences. Data is transmitted by delivering a combination of multiple PN sequences among a set of pre-assigned PN sequences. In the MPC/SS systems, every PN sequence on transmission is modulated by q-ary coherent or differential phase shift keying (PSK). Symbol error rate (SER) and average bit error rate (BER) in coherent and differential MPC/SS systems are investigated. The BER comparison between the MPC/SS systems and simple multicode SS systems with q-ary coherent and differential PSK is also presented. Numerical results show that the MPC/SS systems are superior to the conventional q-ary PSK systems, if they have equal spectral efficiency.},
 pages = {1196--1203},
 title = {Error rate analysis of coherent and differential multiphase parallel combinatorial spread spectrum communication systems},
 volume = {E80-A},
 year = {1997}
}