Method of enhancing security for the transmission of information
First Claim
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1. A method of transmitting bits for an ith user compromising the steps of:
- assigning an ith row vector to the ith user;
transmitting a bit n associated with the ith user using the ith row vector in a first system of orthogonal functions; and
transmitting a bit n+r, where r is a variable not equal to zero associated with the ith user using the ith row vector in a second system of orthogonal functions, wherein the first system of orthogonal functions is not identical to the second system of orthogonal functions.
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Abstract
Quasi-Walsh function systems are developed which allow multiple access as well as spectral spreading for interception and jamming prevention. Mutual interference is minimal due to orthogonal spreading. High signal hiding capability occurs by utilizing a large number of distinct orthogonal codes. An encoding algorithm is presented which allows a simple way of “keeping track” of the different systems of Quasi-Walsh systems as well as determining appropriate values for given users at specified chip values.
16 Citations
24 Claims
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1. A method of transmitting bits for an ith user compromising the steps of:
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assigning an ith row vector to the ith user;
transmitting a bit n associated with the ith user using the ith row vector in a first system of orthogonal functions; and
transmitting a bit n+r, where r is a variable not equal to zero associated with the ith user using the ith row vector in a second system of orthogonal functions, wherein the first system of orthogonal functions is not identical to the second system of orthogonal functions. - View Dependent Claims (2, 3, 4, 5)
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6. A method of transmitting information comprising the steps of:
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transmitting a first set of information for a user over a communication channel modulated using a first code, the first code corresponding to a row vector i in a first system of orthogonal functions; and
transmitting a second set of information for the user over the communication channel modulated using a second code in place of the first code, the second code corresponding to a row vector j in a second system of orthogonal functions. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)
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Specification