Radio link design and reverse link capacity on microcellular DS-CDMA wideband transmission systems

A microcellular DS-CDMA radio link design methodology and an evaluation met hod are proposed in this paper. The normalized link capacity (link capacity /process gain) and maximum average transmitting power of a mobile station a re analyzed for the reverse link in a wideband propagation environment. The bit error rate (BER) is derived for an exponential delay profile with the parameter of normalized transmission bandwidth (transmission bandwidth B x delay spread tau(s)). The average interference noise power of the other use rs from their own cells and that from other cells are derived based on powe r control error and the standard deviation of short-term fading. From these results, we derive the normalized link capacity and the maximum average mo bile station transmitting power. The transmitting power is reduced by more than 40% for B tau(s) less than or equal to 2 by combining space and path d iversity. The link capacity is proportional to the number of antenna branch es. (C) 1999 Scripta Technica, Electron Comm Jpn Pt 1, 82(9): 51-60, 1999.