Title :
Synthesis of low-crest waveforms for multicarrier CDMA system
Author :
Ho, T.F. ; Wei, Victor E.
Author_Institution :
Dept. of Inf. Eng., Chinese Univ. of Hong Kong, Shatin, Hong Kong
Abstract :
The crest factor of a waveform is the ratio of its peak power to its average power. A low crest factor increases the efficiency of the transmitter power amplifier. We study the problem of synthesizing signals with low crest factor for multi-carrier code division multiple access (MC-CDMA) systems. By using Golay (1961) complementary sequences as spreading codes, the crest factor is upper bounded by 6 dB regardless of the length of the spreading code. In comparison, the crest factor of DS-SS-CDMA pulses with certain chip shapes can grow unbounded. We also present methods for constructing a large number of pulses to accommodate multiple-access users
Keywords :
Golay codes; code division multiple access; pseudonoise codes; sequences; signal synthesis; spread spectrum communication; DS-SS-CDMA pulses; Golay complementary sequences; average power; chip shapes; code division multiple access; crest factor; low crest waveforms synthesis; multicarrier CDMA system; peak power; signal synthesis; spreading code length; spreading codes; transmitter power amplifier efficiency; Code division multiaccess; Golay codes; Pseudonoise coded communication; Sequences; Signal design;
Conference_Titel :
Global Telecommunications Conference, 1995. Conference record. Communication Theory Mini-Conference, GLOBECOM '95., IEEE
Print_ISBN :
0-7803-2509-5
DOI :
10.1109/CTMC.1995.502946
