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本文提出了一种具有纠错功能的微机化时分多路复用(TDM)方案,并从数字传输损伤角度系统地对该方案进行了性能分析评价。它采用了一种新的帧结构,复接效率高于CCITT建议的帧结构;它没有传统的码速调整过程,恢复时钟收端再生,且无需锁相平滑。整个系统可由一台单板微机和若干通用接口组成。系统功能,包括输入/输出、帧同步、纠错、自校和指标在线测量等,均由软件实现。为了保证工作质量,提出并采用了可以消除固有抖动的“多帧平均法”,能够减小滑动损伤的“双校验法”,以及可以消除漂移损伤的“步进式自适应调整”技术。
This paper presents a computerized time division multiplexing (TDM) scheme with error correction, and systematically analyzes and evaluates the scheme from the perspective of digital transmission impairments. It uses a new frame structure, the multiplexing efficiency is higher than the CCITT proposed frame structure; it does not have the traditional code speed adjustment process, recovery clock recovery, and without lock-in smoothing. The entire system can be a single board computer and a number of common interface. System functions, including input / output, frame synchronization, error correction, self-calibration and online measurement of indicators, are implemented by software. In order to ensure the quality of work, a “multi-frame averaging method” that can eliminate inherent jitter, a “double check method” that can reduce the sliding damage, and a “step adaptive adjustment” technique that can eliminate drift damage are proposed and adopted.