Spread Spectrum Random Access Networks
Ambatipudi R. Sastry · 1993
A new method of code allocation in Code Division Multiple Access is proposed, based on partitioned information 'classes' (CDMA-IC), that is particularly efficient in meeting multicasting needs. Transmitters choose spreading codes based on the types of messages they are transmitting, and receivers listen to codes corresponding to the types of messages they are interested in. The performance of this approach can exceed that of both the traditional receiver-directed codes or broadcast codes in environments where there are several multicast groups (in which a given message is of interest to more than one node), or where it is difficult to know what types of messages (out of a fixed set of message types) a receiver is interested in at any particular time. Performance is further enhanced when receivers can simultaneously attempt to correlate multiple spreading codes. A broad theoretical framework was developed for the CDMA-IC concept and numerical results through simulation were obtained and compared to receiver-directed and broadcasting scenarios. Spread spectrum, Random access, Code division, Multiple access, Information classes, Code allocations, Receiver-directed assignments, Broadcasting, Message interest level