Title :
Spread spectrum multiple access performance of orthogonal codes in fading multipath channels
Author :
Chase, M. ; Pahlavan, K.
Author_Institution :
Worcester Polytech. Inst., MA, USA
Abstract :
Indoor wireless communications (IWC) is an attractive alternative to wire-based local area networks. However, the indoor environment is characterized by fading multipath channels. Direct-sequence spread-spectrum techniques, with their inherent resistance to multipaths, are promising for IWC. To allow multiple users within a limited bandwidth, code division multiple access (CDMA) is needed. The authors analyze one relevant CDMA technique. A set of M-orthogonal sequences of length N is assigned to each of K users. The sequences consist of phase-modulated signals on the same carrier frequency. The bandwidth efficiency achieved over fading multipath channels is the presence of additive white Gaussian noise and multiple-access interference is determined.<>
Keywords :
code division multiple access; codes; fading; radio systems; radiofrequency interference; spread spectrum communication; white noise; CDMA; additive white Gaussian noise; bandwidth efficiency; carrier frequency; code division multiple access; fading multipath channels; indoor wireless communications; multiple-access interference; orthogonal codes; spread-spectrum techniques; Additive white noise; Bandwidth; Fading; Frequency; Indoor environments; Local area networks; Multiaccess communication; Multipath channels; Spread spectrum communication; Wireless communication;
Conference_Titel :
Military Communications Conference, 1988. MILCOM 88, Conference record. 21st Century Military Communications - What's Possible? 1988 IEEE
Conference_Location :
San Diego, CA, USA
DOI :
10.1109/MILCOM.1988.13382
