Abstract
In this paper, an innovative and reliable frame synchronization scheme is proposed for second generation digital video broadcasting (DVB-S2) system in Variable Coded Modulation (VCM) service. Frame synchronization in VCM suffers many difficulties from large frequency offset, extremely low SNR and variable physical layer frame (PLFRAME) lengths. To cope with variable PLFRAME lengths, multi-windows are proposed and utilized. Multi- windows threshold-based search algorithm is presented with theoretical analysis to decrease the missed detection probability. Experimental results demonstrate that our proposed method is more robust and reliable than the existing approaches, especially in low signal to noise ratios (SNRs) and large frequency offsets.
Highlights
Second generation digital video broadcasting (DVB-S2) via satellites has been standardized for a decade
Compared with DVB, DVB-S2 provides Adaptive Coded Modulation (ACM) and Variable Coded Modulation (VCM), implying that channel coding and modulation could be changed on a frame-by-frame basis [1]
Even though VCM can provide an obvious improvement in achievable throughput over constant coded modulation (CCM), with nearly 1.7 times [2], it suffers many difficulties from frame synchronization, because of large frequency offset, extremely low signal to noise ratios (SNRs) and variable physical frame lengths
Summary
Second generation digital video broadcasting (DVB-S2) via satellites has been standardized for a decade. VCM makes full use of the channel by transmitting more information bits when signal-to-noise ratio (SNR) is high, e.g., uses 9/10 LDPC and 32APSK combination, and makes sure of receiver performance by throttling down the information rate when SNR is low, e.g., exploits 1/2 LDPC and QPSK combination This flexible character results in a much higher total throughput than that obtained with constant coded modulation (CCM). The performances of existing methods for frame synchronization are unsatisfactory at low SNRs. In this paper, multi-windows threshold-based search algorithm is developed to cope with these problems. The complete frame synchronization schemes are proposed in detail, including differential detection module and multiwindows threshold-based algorithm.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
