Equalization digital on-channel repeater in the single frequency networks

Digital On-Channel Repeater (DOCR) can be used for Single Frequency Networks (SFN´s). It is much simple and low cost compared to Distributed Transmitter which needs Studio to Transmitter Link (STL). However, traditional DOCR has one of those defects such as a power limit, a long time system processing delay or a poor output signal quality. In order to overcome all of those defects, we introduce Equalization DOCR (EDOCR) which regenerates the original 8-VSB output signal with relatively short time system processing delay. Lab. and Field test results show that the EDOCR can eliminate the loop-back signal up to 5.5 dB with 5.5 μs system processing delay. By using EDOCR, we can save spectrum resources and extend coverage areas.