Multiplex communications – Communication over free space – Combining or distributing information via code word channels...
Reexamination Certificate
2006-04-04
2006-04-04
Urban, Edward F. (Department: 2685)
Multiplex communications
Communication over free space
Combining or distributing information via code word channels...
C375S146000, C375S147000, C455S422100
Reexamination Certificate
active
07023830
ABSTRACT:
A spectrum spreading of despreading device, in particular for transmission in a code division multiple access cellular mobile radio system is disclosed. In order to spread or despread an incoming sequence by means of spreading code of length Q, first, the data symbols of the income sequence are distributed into difference sub-sequences, and then each of the sub-sequences are spread or despread using a spreading code of length Q0that is a multiple of length Q. The sub-sequences and the spreading codes of length Q0that are applied to them are determined so that the sequence that would be obtained by superimposing the spread or despread sub-sequences obtained in this way is the same as that which would be obtained by spreading or despreading the incoming sequence using the code of length Q.
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Azad, H. et al.: “Multitrate Spread Spectrum Direct Sequence CDMA Techniques” IEEE Colloquium on Spread Spectrum Techniques for Radio Communications Systems (Digest no. 95), Apr. 27, 1993, Apr. 15, 1994, pp. 4/1-4/5, XP0000570787.
Alcatel
Craver Charles
Urban Edward F.
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