One or more radio stations in a mobile communications system of spread spectrum sequence directly, in a mobile communications system with code division multiple access.Process in a communications system for code division multiple access CDMA codes, code generator providing spread CDMAProcess in a mobile communication system including a plurality of radio base stations, and process in a mobile communication system including a base station.

摘要

One or more radio stations in a mobile communications system of spread spectrum sequence directly, in a mobile communications system with code division multiple access.Process in a communications system for code division multiple access CDMA codes, code generator providing spread CDMAProcess in a mobile communication system including a plurality of radio base stations, and process in a mobile communications system including a base station.Sequ00b3u00eancias optional code are generated for use in functions of propagation and despropagau00e7u00e3o in a communications system for code division multiple access (CDMA).In particular,A family of codes of spread quadrifu00e1sicos is employed that provides a maximum number of codes of spread for a high capacity communications system while the CDMAAt the same time having a minimum cross correlation between any two codes of spread in the family to ensure that the interference of cross correlation is maintained at or belowAcceptable levels.The family code of spread quadrifu00e1sico ideal is the family s (2) of sequ00b3u00eancias quadrifu00e1sico code of length L = 2 ^ m ^ - 1, where m is an integer greater than or equal to 5.The size of the family s (2) codes of spread the Quaternary is (L + 2) (L + 1) ^ 2 ^, and the maximum cross correlation is 1 + 4 sym (L + 1).The codes of spread preferably are allocated to base stations using subsets of code specific to the family s (2) having the same properties of cross correlation of the family s (0) and /U s (1) codes. The codes of spread are advantageously extended in one or more symbols of code when needed or otherwise desirable.For example, to support the services of transmission rate variable.For convenience in the use of spread codes whose length can be expressed as a whole multiple of each factor of propagation in mobile communication system.Since the codes to spread individual has a length of 2 ^ m ^ - 1, a symbol of the code is added to the spread code generated.