Spread Spectrum Techniques and their Applications to Wireless Communications
Ernestina Cianca, Ramjee Prasad · IETE Journal of Research · 2005
Spread Spectrum (SS) radio communications is on the verge of potentially explosive commercial development. A SS-based multiple access, such as CDMA, has been chosen for 3G wireless communications. Other current applications of SS techniques are in Wireless LANs and Satellite Navigation Systems. However, SS techniques will play an important role also in future wireless applications, mainly combined with other technologies such as OFDM, MIMO and UWB. In this paper, after an overview on SS signalling and its advantages, some of the most important techniques based on SS signalling for current and future wireless applications are described. Particular relevance is given to DS- CDMA and hybrid CDMA-based multiple access schemes, such as TDMA-CDMA, OFDM-CDMA.