to a 0 t is a symbol interval b is a number of modeled base stations which are indexed by subscript s which ranges from 1 to b the term u201c base station u201d may be used herein to convey cells or sectors l a s is the number of resolvable or modeled paths from base station s to antenna a of the mobile and is indexed from 1 to l a s u03b1 a s l and u03c4 a s l are respectively the complex gain and delay associated with an l th path from base station s to antenna a of the mobile k s represents a number of active sub channels in base station s that employ code division multiplexing to share the channel the sub channels are indexed from 1 to k s u s k t is a code waveform e g spreading waveform used to carry a k th sub channel 39 s symbol for an s th base station e g a chip waveform modulated by a sub channel specific walsh code and covered with a base station specific pn cover b s k is a complex symbol being transmitted for the k th sub channel of base station s and w a t denotes zero mean complex additive noise on the a th antenna the term w a t may.