Patent ID: 6108349
Filing Date: 2000-08-22
Classification: H04L

Abstract:
A method of establishing an up-stream multi-access (UMAC) channel, in a multi-point communications system, from one of a plurality of remote service unit transmitters to a primary site receiver, the primary site receiver being disposed at a primary site and the remote service unit transmitters being disposed at a plurality of respective secondary sites, the method comprising:receiving, at the primary site, an asynchronous transmission sequence (ATS) signal transmitted from a remote service unit (RSU), said ATS signal comprising symbols out of alignment with the primary site, each symbol having a phase, a power level and an amplitude, said symbols being grouped into blocks, said blocks being segmented to form an establishment segment and a data segment in the ATS signal;identifying the onset of the ATS signal based on at least one of the amplitude, power level and phase of symbols received by the primary site in the upstream multi-access (UMAC) channel;estimating a synchronization reference point within the received ATS signal based on at least one of the amplitude, power level and phase of symbols received by the primary site;identifying a first block within the data segment based on said synchronization reference point; anddemodulate data within each block of the data segment beginning with said first block.