US Patent No: 5,353,352

Number of patents in Portfolio can not be more than 2000

Multiple access coding for radio communications

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ATTORNEY / AGENT: (SPONSORED)
 

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Abstract

Individual information signals encoded with a common block error-correction code are assigned a unique scrambling mask, or signature sequence, taken from a set of scrambling masks having selected correlation properties. The set of scrambling masks is selected such that the correlation between the modulo-2 sum of two masks with any codeword in the block code is a constant magnitude, independent of the mask set 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 scrambling 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.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
ERICSSON GE MOBILE COMMUNICATIONS INC.LYNCHBURG, VA374

International Classification(s)

  • [Classification Symbol]
  • [Patents Count]

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Bottomley, Gregory E Cary, NC 168 2002
Dent, Paul W Pittsboro, NC 299 10642

Cited Art

Patent Info (Count) # Cites Year
 
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Patent Citation Ranking

Forward Cites

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