Method for decoding channelisation code set information in a spread spectrum receiver

Abstract

A method of decoding channelisation code set information to determine the number P of channelisation codes and the code offset O in a spread spectrum data transmission, wherein the channelisation code set information 32 includes a first group of bits encoding the number of channelisation codes and a second group of bits encoding the code offset, the method including the steps of: deriving (30-40) the number P of channelisation codes according to P = C + ⌊ m - A n ⌋ ; and deriving (42-48) the code offset O according to O = ⌊ P n ⌋ × ( m - 2 ⁢ B ) + ( B + 1 ) ; where m is the maximum number of multicodes allocated from the spread spectrum data transmission, n = ⌊ m 2 ⌋ + 1 , A is the value of the first group of bits of the channelisation code set information, B is the value of the second group of bits of the channelisation code set information, and C = A + ⌊ B m - A ⌋ × ( m - 2 ⁢ A ) .

Dependencies are inferred from the claim text.