A multi-rate CDMA system with block-spreading schemes for anti-interference and high frequency efficiency

Authors:
Mitsuhiro Tomita;Noriyoshi Kuroyanagi;Kohei Ohtake;Naoki Suehiro;Sinya Matsufuji
Affiliations:
Tokyo University of Technology;Chubu University;Hosei University;Tsukuba University;Yamaguchi University
Venue:
Proceedings of the 2006 international conference on Wireless communications and mobile computing
Year:
2006

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Abstract

For mobile systems higher than 3G, multi-rate data service is becoming an important issue. This paper proposes a multi-rate block-spreading CDMA system as an efficient scheme which is capable of intra-cell-interference free operation and inter-cell-interference reduction by a factor of reciprocal of the spreading factor. With a use of an accurate pilot transmission scheme, it is shown that a high frequency utilization efficiency can be achieved for various mixed data rate services.