Adaptive continuous-time equalization and FDTS/DF sequence detection

摘要

An adaptive analog continuous-time forward equalizer and a Fixed Delay Tree Search with Decision Feedback (FDTS/DF) detector can be used to implement high speed low power sequence detection for a magnetic recording system. An analog continuous-time forward equalizer offers a low power, high speed solution to the equalization problem, although it cannot achieve the degree of pulse shape control provided by a long FIR filter. However, an FDTS/DF detector can be easily adapted to cope with the resulting imprecisely equalized pulses. Earlier work demonstrated the suitability of a Complex Graphic Equalizer (CGE) for the adaptive continuous time forward equalizer. System simulations indicated the viability of a CGE-FDTS/DF detector in a 2/3(1,7) coded channel. New results explore the performance of a CGE-FDTS/DF system for an 8/9(0,3) coded channel. Additionally, the feasibility of a CGE-EPR4 detection system is demonstrated.