Patent ID: 8619974

Claim:
A method, comprising: encoding a first bit stream of a first terminal based on a turbo encoding scheme, scrambling the encoded first bit stream according to a first scrambling signature with a first initial vector, and spreading the scrambled and encoded first bit stream to match a communication channel bandwidth; encoding a second bit stream of a second terminal based on the turbo encoding scheme, scrambling the encoded second bit stream according to a second scrambling signature with a second initial vector, and spreading the scrambled and encoded second bit stream to match the communication channel bandwidth; and outputting a composite signal based on the turbo encoded first bit stream and the turbo encoded second bit stream; wherein the use of the first initial vector with the first scrambling signature for the first bit stream and the second initial vector with the second scrambling signature for the second bit stream serves to distinguish the first bit stream of the first terminal from the second bit stream of the second terminal to provide a multiple access scheme; and wherein the turbo code encoding utilizes constituent encoding having a transfer function: G â¡ ( D ) = [ n 0 â¡ ( D ) d â¡ ( D ) , n 1 â¡ ( D ) d â¡ ( D ) , â€¦ â¢ â¢ n 6 â¡ ( D ) d â¡ ( D ) ] where, d ( D )=1+ D 3 n 0 ( D )=1 n 1 ( D )=1+ D 2 n 2 ( D )=1+ D 2 +D 3 n 3 ( D )=1+ D+D 2 +D 3 n 4 ( D )=1+ D+D 3 n 5 ( D )=1+ D+D 2 n 6 ( D )=1+ D.