Residue code based low cost SEU-tolerant fir filter design for OBP satellite communication systems

Wenhui Yang,Jing Wang,Xiang Chen,Ming Zhao,Zhen Gao

doi:10.1186/1687-1499-2012-174

Abstract

Abstract With the development of satellite communications, on-board processing (OBP) obtains more and more attentions due to the increased efficiency and performance. However, the large amounts of digital circuits in the OBP transponders are sensitive to the high-energy particles in space radiation environments, which may cause various kinds of single event effect. Among these effects, single event upset (SEU) is the major potential reason for the instability of the satellite communication systems. Triple modular redundancy (TMR) is a classical and effective method for mitigating the SEU in digital circuits. However, since three identical logic modules and a voting circuit are needed in TMR, the overhead is so high that the scheme may not be applicable on the on-board digital processing platform with very limited area and power resources. Therefore, how to design a more cost-effective fault-tolerant method becomes a critical issue. Considering that FIR-like processing is frequently used on OBP platform, in this article, a dual modules (DM) plus checking module based on residue code (DM-CRC) architecture for SEU-tolerant FIR design is proposed. Although this architecture reduces the area overhead dramatically, we find that the fault missing rate is still high if single-sample checking (SSC) is used. To solve this problem, a Multi-sample checking DM-CRC (MSC-DM-CRC) is further proposed. Our analysis shows that the MSC-DM-CRC scheme can make the fault missing rate small enough without reducing the actual throughput. By simulations it is shown that, when the modulus for CRC is 7 and the number of samples for MSC is 4, the reduction of area overhead relative to TMR is over 20% and the fault missing rate is as low as 0.05%.

Highlights

Traditional bent pipe (BP) satellite performs only signal amplification and frequency translation
Our key contributions in this article include three points: (1) A simple dual modules (DM) plus checking module based on residue code (DM-checking modules based on residue code (CRC)) structure is proposed to reduce the heavy cost of traditional Triple modular redundancy (TMR) method; (2) The fault missing problem of general residue code based checking module is revealed; (3) we propose a multi-sample checking (MSC) solution to decrease the fault missing rate
6 Conclusion To reduce the area and power overhead of TMR protected on board processing (OBP) transponders, a simple and effective single event upset (SEU)-tolerant design is proposed for the basic FIR implementation

Summary

Introduction

Traditional bent pipe (BP) satellite performs only signal amplification and frequency translation. 2 Related work and mathematical background Many fault-tolerant schemes based on residue code have been proposed to reduce the overhead of TMR for FIR design. Before introducing these schemes, the property of residue code and residue number system (RNS) is introduced firstly. To avoid the heavy implementation cost of multiple CRT modules and the corresponding protections, several researches are proposed to apply residue code just for checking based on Equation (2). One of such schemes is the duplication with comparison combined with concurrent error detection (DWC-CED) proposed in [28].

Architecture and working procedure of SSC based

Findings

Conclusion