S-CDMA FIXED WIRELESS LOOP SYSTEM EMPLOYING SUBSCRIBER UNIT/RADIO BASE UNIT SUPER-FRAME ALIGNMENT

摘要

A method for operating a synchronous Code Division Multiple Access (S-CDMA) radio frequency communication system having a host unit (RBU-12) and a plurality of user units (SU-14). The method includes steps of: defining a super-frame to be comprised of three frames of data, aligning a receiver timing and a transmitter timing of the user (SU-14) to the super-frame boundary based on at timing correction parameter received from the host (RBU-12) . The super-frame boundary, which corresponds to the point in time immediately before the synchronization field of frame #1, effectively incurs a time delay of (D1 = d1 + d2 + d3) before reaching the receiver (Rx 40) of the SU-14. During the step of aligning the transmitted frames of data to the super-frame boundary, the RBU-12 and the SU-14 communicate with each other over an asynchronous side channel. The communication is switched to a synchronous communication channel when the alignment procedure is completed.