Patent ID: 8116419
Filing Date: 2012-02-14
Classification: H04L,H04W

Abstract:
1. A method for time delay and frequency offset compensation at a broadcast head end in a hybrid single frequency network, the method comprising: transmitting an uplink signal carrying at least one block of transmitted samples; receiving a downlink signal, the downlink signal being a distorted copy of the uplink signal; generating a plurality of blocks of received samples based on the received downlink signal; computing a maximum correlation between the block of transmitted samples and each of the plurality of blocks of received samples; estimating a time delay and frequency offset between the uplink and downlink signals based on the maximum correlation, wherein the estimated time delay is based on an index of the block of received samples associated with the maximum correlation; and compensating for time delay and frequency offset between subsequent transmitted and received signals based on the estimated time delay and frequency offset.