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

Abstract

For mobile systems higher than 3G, multi-rate data service is becoming an important issue. This paper proposes a multi-rate blockspreading 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.