<title>Fast synchronization algorithms of burst-mode 16 QAM receiver for video-on-demand applications</title>

Abstract

This paper describes a novel TDMAIFDMA combined 16 QAM receiver architecture developed for video-on-demand applications. A burst-operated rapid synchronisation scheme is proposed which employs an efficient training preamble for overlapped operation of automatic gain control, carrier phase acquisition and symbol timing alignment. All the dedicated synchronisation algorithms are digitally implemented, using field programmable gate arrays (FPGA), for a data rate of 1O.8Mbit/s. Several analytic relationships for control accuracy, acquisition time and signal to noise ratio (S/N) are derived. Experimental results demonstrate that the proposed method significantly decreases the required preamble length to 23 symbols, together with a dynamic range of 1 1dB and a sensitivity of-56dBm for a bit-error-rate (BER) of 5*1 O. The BER performance with frequency offset and input power variation is also investigated.