Title :
System design for DS/SSMA communications with negative chip excess bandwidth
Author :
Lehnert, James S.
Author_Institution :
Sch. of Electr. & Comput. Eng., Purdue Univ., West Lafayette, IN
Abstract :
Direct-sequence spread-spectrum multiple-access communications, strictly band-limited chip waveforms, random spreading sequences, an additive white Gaussian noise channel, and conventional matched filter receivers are considered. In this paper, system design with negative chip excess bandwidth is investigated. The effect of multiple-access interference (MAI) and interchip interference (ICI) on the system performance is analyzed. It is shown that the bit-error-rate can be reduced in near-far situations or in situations with unequal received powers by using chip waveforms with negative excess bandwidth. Other effects of using negative chip excess bandwidth are discussed. Numerical results are also provided.
Keywords :
AWGN channels; bandlimited communication; code division multiple access; error statistics; interference (signal); matched filters; receivers; spread spectrum communication; DS/SSMA; ICI; MAI; additive white Gaussian noise channel; band-limited chip waveforms; bit-error-rate; chip waveforms; direct-sequence spread-spectrum multiple-access communications; interchip interference; matched filter receivers; multiple access interference; near-far situations; negative chip excess bandwidth; random spreading sequences; received powers; system design; system performance; Additive white noise; Bandwidth; Baseband; Bit error rate; Matched filters; Multiple access interference; Performance analysis; Pulse shaping methods; Spread spectrum communication; System performance;
Conference_Titel :
Military Communications Conference, 2001. MILCOM 2001. Communications for Network-Centric Operations: Creating the Information Force. IEEE
Print_ISBN :
0-7803-7225-5
DOI :
10.1109/MILCOM.2001.986001
