Title :
Coherent M-ary spreading-code-phase-shift-keying modulation for direct-sequence spread spectrum systems
Author_Institution :
Inst. of Commun. Eng., Nat. Tsing Hua Univ., Hsinchu, Taiwan
Abstract :
In this work, a generalized form of spreading-code-phase-shift-keying (SCPSK) modulation is proposed. The performance of M-SCPSK modulation with a coherent receiver in an AWGN channel, exposed to multi-user interference, is investigated. Two types of M-ary SCPSK modulation - one employing short spreading codes and the other employing long spreading codes - are examined and the union bounds of symbol error probabilities are derived. Additionally, feasible designs of the M-CPSK transmitter and receiver are proposed. The M-SCPSK system employing long spreading codes is found to be more flexible and therefore more suitable for packet data service applications.
Keywords :
AWGN channels; code division multiple access; error statistics; multiuser channels; phase shift keying; radio receivers; radio transmitters; spread spectrum communication; AWGN channel; CSK modulation; M-CPSK receiver; M-CPSK transmitter; SCPSK modulation; code shift keying; coherent M-ary spreading-code PSK; coherent receiver; direct-sequence spread spectrum systems; long spreading codes; multiuser interference; packet data services; short spreading codes; spreading-code-phase-shift-keying; symbol error probability bounds; AWGN channels; Demodulation; Information rates; Interference; Modulation coding; Multiaccess communication; Phase modulation; Phase shift keying; Spread spectrum communication; Transmitters;
Conference_Titel :
Vehicular Technology Conference, 2004. VTC2004-Fall. 2004 IEEE 60th
Print_ISBN :
0-7803-8521-7
DOI :
10.1109/VETECF.2004.1400110
