Patent ID: 6934317
Filing Date: 2005-08-23
Classification: H04L

Abstract:
1. A communications system for communicating with a plurality of terminals, the system comprising: a network station; a variable error correction encoder that error correction encodes respective bitstreams for respective ones of the plurality of terminals according to respective selected coding rates of a plurality of coding rates; a variable symbol generator that maps respective ones of the error correction coded bitstreams to respective symbol streams according to respective signal constellations of a plurality of signal constellations of various orders; a variable spreader that spreads the respective symbol streams according to respective orthogonal spreading codes of a plurality of mutually orthogonal spreading codes of various lengths; a transmitter that transmits the spread symbol streams from the network station in a communications medium; and a controller, operatively associated with the variable error correction encoder, the variable symbol generator and the variable spreader, that selects respective combinations of coding rate, signal constellation and spreading code applied to the respective bitstreams such that the spread symbol streams transmitted from the network station are spread according to mutually orthogonal spreading codes.