METHOD AND APPARATUS FOR MULTIPLE ACCESS OVER A COMMUNICATION CHANNEL

摘要

This invention is a multiple access communication technique by which a multitude of transmitters communicate with receivers using direct sequence spread spectrum signaling. The direct sequence codes are reused by a large number of simultaneous transmitters, so the system is named Code Reuse Multiple Access ("CRMA"). This reuse method requires only a small number of codes relative to the number of simultaneous transmitters, and can use as fe w as one code for all the users. The direct sequence codes are not required to have special properties such as maximal length. The lengths of the spreading codes employed are not necessarily related to the bit or symbol interval (bu t in general they cover more than one symbol interval). CRMA can be implemente d on a Paired Carrier Multiple Access ("PCMA") system with or without a novel receiver structure which is also described.