Multiplex communications – Generalized orthogonal or special mathematical techniques
Patent
1997-09-30
2000-03-21
Hsu, Alpus H.
Multiplex communications
Generalized orthogonal or special mathematical techniques
370320, 370342, 708250, 708253, 375219, H04B 7216, H04B 7212, H04B 138
Patent
active
060410345
ABSTRACT:
Co-channel interference may be prevented even if data having different transmission rates are concurrently multiplied to a same frequency band width with a different spreading factors. A method for generating code division multiple access data from data having different rates by a direct spread spectrum includes the steps of combining an orthogonal code and a reversed orthogonal code obtained by inverting the orthogonal code, for each of orthogonal code sequence structured by an m-sequence thereby to generate a first sequence of orthogonal codes, combing two of the orthogonal code for each of orthogonal code sequences structured by the m-sequence thereby to generate a second sequence of orthogonal codes, combining two of the reversed orthogonal code for each of orthogonal code sequences structured by the m-sequence thereby to generate a third sequence of orthogonal codes, and generating another orthogonal code having twice a code length of the orthogonal code from the first, second and third sequence of orthogonal codes; and multiplying the generated orthogonal code and a different m-sequence, together.
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Fukumasa Hidenobu
Hamada Hajime
Nagatani Kazuo
Oishi Yasuyuki
Fujitsu Limited
Hsu Alpus H.
Qureshi Afsar M.
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