A CDMA-based Switched LAN with Bus Architecture

Abstract

A CDMA-based switched LAN technology with a bus architecture has been described. Each CDMA station has a simple send/receive interface pair while the CDMA SWITCH has such a pair for each station. The SWITCH dynamically allocates chip sequences to the station at the beginning of their sessions, provides the synchronization clock to them and store-forwards their frames. A novel continuous averaging circuit, employing the concept of attenuated analog multiplexing has been employed in the design of the CDMA receive interface. The LAN has two very important advantages. First, it provides to the station a dedicated channel access which implies no access delay, whatsoever, no collisions and hence no need for priority access. Second, it provides high security of data at a low level because of coded bit communication and sessionwise dynamic allocation of codes by the SWITCH. Work on the laboratory implementation of a small 4-port LAN using discrete components is in progress.

Indexing terms:

• CDMA LAN
• Switched LAN
• Bus-structured LAN