one or more radio stations in a direct sequence spread spectrum mobile communication system, in a code division multiple access mobile communication system, process in a code division multiple access communication system, cdma codes providing cdma propagation codes, process in a mobile communication system including a plurality of base radio stations, and process in a mobile communication system including a base station

摘要

"one or more radio stations in a direct sequence spread spectrum mobile communication system, in a code division multiple access mobile communication system, process in a code division multiple access communication system, generator of cdma codes providing cdma propagation codes, process in a mobile communication system including a plurality of base radio stations, and process in a mobile communication system including a base station ". Optional code strings are generated for use in propagation and propagation functions in a code division multiple access (cdma) communications system. In particular, a family of four-phase propagation codes is employed which provides a maximum number of propagation codes to realize a high capacity in the cdma communication system while at the same time having a minimal cross correlation between any two propagation codes within that family to ensure. that cross-correlation interference is maintained at or below acceptable levels. that ideal four-phase propagation code family is family s (2) of four-phase code sequences of length l = 2 ^ m-1 ^, where m is an integer greater than or equal to 5. the family size s ( 2) of quaternary propagation codes is (1 + 2) (1 + 1) ^ 2 ^, and the maximum cross correlation is 1 + 4 sym (1 + 1). preference propagation codes are allocated to base stations using s (2) family specific code subgroups having the same s (0) and / or s (1) family cross-correlation properties. propagation codes are advantageously extended into one or more code symbols when necessary or otherwise desirable. For example, to support variable baud services, it is convenient to employ propagation codes whose length can be expressed as an integer multiple of each propagation factor in the mobile communications system. Since individual propagation codes have a length of 2 ^ m ^ -1, a code symbol is added to the generated propagation code.