H - Electricity – 04 – W
Patent
H - Electricity
04
W
H04W 84/02 (2009.01) H04W 4/18 (2009.01) H04W 12/08 (2009.01) H04W 88/02 (2009.01) H04W 88/08 (2009.01) H04B 1/707 (2006.01)
Patent
CA 2643142
Information symbols spread using orthogonal or bi-orthogonal codewords are assigned a unique scramble mask that is taken from a set of scramble masks having selected correlation properties. The set of scramble masks is selected such that the correlation between the modulo-2 sum of two scramble masks with any codeword is a constant magnitude, independent of the codeword and the individual masks being compared. In one embodiment, when any two masks are summed using modulo-2 arithmetic, the Walsh transformation of that sum results in a maximally flat Walsh spectrum. For cellular radio telephone systems using subtractive CDMA demodulation techniques, a two-tier ciphering system ensures security at the cellular system level by using a pseudorandomly generated code key to select one of the scramble masks common to all of the mobile stations in a particular cell. Also, privacy at the individual mobile subscriber level is ensured by using a pseudorandomly generated ciphering key to encipher individual information signals before the scrambling operation.
Bottomley Gregory E.
Dent Paul W.
Ericsson Inc.
Ericsson Canada Patent Group
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