Patent ID: 7269126

Claim:
A method of constructing orthogonal codes of length N for use in a network utilizing quasi-synchronous code division multiple access combined with time division duplexing, the method comprising: a) determining the balanced vectors of length N, being all possible cross-correlation vectors resulting from zero cross-correlation of codes of length N; b) providing an arbitrary code of length N; c) performing bitwise XOR-ing with all the balanced vectors determined in a), to produce a set of codes with which the arbitrary code is orthogonal; d) performing bitwise XOR-ing of the balanced vectors determined in a); e) adding the code to a set of orthogonal codes if the result of d) is balanced; f) performing a) through e) until the set of orthogonal codes contains maximally N orthogonal codes; and g) applying the set of orthogonal codes to a plurality of data streams in the network so as to provide spread spectrum data streams.