A parallelized feedforward timing recovery scheme for inter-satellite optical communication

Abstract

Feed-forward timing recovery scheme has the advantage of fast estimation without acquisition time, but it is rarely used in resource-constrained spaceborne applications because of the computational complexity required to achieve highperformance estimation. In view of the limited resources and weak receiving power of the inter-satellite optical communication system, a low-complexity and parallelized feedforward timing recovery scheme is presented in this paper. Low-pass filtering based on Kalman filter is introduced to estimate the timing offset accurately. Phase jump detector is added to avoid the timing phase slip at 0/π that traditional feedforward timing recovery faces in low SNR. The corresponding experiment results show that the proposed scheme can achieve stable estimation and correction of clock bias under the condition of low signal-to-noise ratio with low implementation complexity.