Patent ID: 7657225
Filing Date: 2010-02-02
Classification: H04B,H04L

Abstract:
1. A method of transmitting digital data in a hierarchical transmission system comprising the steps of: providing at least a first digital data stream and a second digital data stream; providing a non-binary, pseudo-random encoding of the second digital data stream but not the first digital data stream, said non-binary, pseudo-random encoding of the second digital data stream comprising consecutive groups of n bits in the second digital data stream, wherein n is one of equal to or greater than two, and creating a n-×-1 matrix and multiplying the same by a predetermined n-×-m matrix of binary numbers, wherein m is at least equal to n and each row of the n-×-m matrix is orthogonal to the other rows thereof, to produce a 1-×-m product matrix of non-binary, pseudo-random numbers; hierarchically modulating a carrier to produce a signal with a first modulation based on the first digital data stream and a second modulation based on at least the non-binary, pseudo-random encoded second digital data stream; and transmitting the signal, whereby the transmitted signal when received may be fully demodulated for the second digital data stream or partially demodulated on the first modulation alone for the first digital data stream with the second modulation appearing as pseudo-Gaussian noise.