Feedback Timing Method Based on Joint Optimization Function of Code Period and Timing Parameters in Non-Cooperative Communication

Abstract

In non-cooperative communication, the code frequency, the pulse shaping filter and other prior parameters are unknown to the receiver, which increases the challenge of non-cooperative receiving system design. A straightforward method may estimate these parameters in advance following traditional receiving systems. Estimation errors will undoubtedly be involved and passed between stages, which will decease system performance, especially in low signal-to-noise ratio (SNR) scenarios. To address this problem, this paper constructs a carefully designed optimization function for timing estimation that combines both the code frequencies and the timing parameters from multiple chips. Consequently, a feedback-based tracking model is proposed to solve such an optimization function. Finally, extensive simulation results validate the efficiency of the proposed method, which achieves ten times better accuracy than the traditional method and can partially overcome the influence of code frequency deviations. INDEX TERMS Non-cooperative communication, timing estimation, Gardner detector, self-noise, early-late detector, code loop tracking.

Feed‐forward timing estimation for burst signals in non‐cooperative communication

“…From the point of view in [14, 28], many timing methods can be understood as obtaining timing estimation by designing the optimal function of time delay . For example, the O&M method can be equalised to solve the optimisation function in formula (2).…”

Design and Implementation of a Low-Complexity Multi-h CPM Receiver with Linear Phase Approximation Synchronization Algorithm

“…It is commonly approached by a finite difference of the outputs from two matched filter banks, of which delays of the on-time MF banks are early and late, respectively, represented as the early-late (EL) synchronizer [27,28]. The EL-based synchronization algorithm is widely utilized for linear [29][30][31] and nonlinear [21,22,26,32] modulation schemes, since it offers high estimation accuracy with low computational cost. The general methods to reduce the complexity of the synchronization depend mainly on the simplification methods of MLSD.…”

Design and implementation of coherent multi-h CPM receiver with low-complexity decision-directed synchronization algorithm

“…It is commonly approached by a finite difference output of the outputs from two matched filter banks, of which delays are early and late of the on-time MF banks, respectively, represented as the early-late (EL) synchronizer [19], [20]. ELbased synchronization algorithm is widely utilized for linear [21]- [23] and nonlinear [15], [18], [24] and [25] modulation schemes since it offers high estimation accuracy with low computation. The general methods to reduce the complexity of the synchronization depend mainly on the simplification methods of MLSD.…”