Title :
Codes for improved timing recovery in PR4 and EPR4 magnetic recording
Author :
McLaughlin, Steven W. ; Lee, Patrick ; Cloke, Robert
Author_Institution :
Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
We consider an alternative to the widely-used (0,G/I) constraint in partial response digital magnetic recording systems. The new one-pairs constraint is an upper bound on the maximum number of symbols between pairs of ones in a coded sequence. Codes for the one-pairs constraint can be used to limit quasi-catastrophic error propagation and improve timing recovery in Class-IV partial response (PR4) and Extended PR4 (EPR4) magnetic recording systems. Rate 4:5, 8:9, 16:17, and 24:25 block and finite state codes are discussed and compared with well-known rate 8:9 and 16:17 block codes. The new codes have improved one pairs statistics, low complexity, and for the 24:25 code, reduced error propagation
Keywords :
Viterbi decoding; block codes; constraint theory; digital magnetic recording; graph theory; partial response channels; runlength codes; synchronisation; Class-IV partial response; EPR4 magnetic recording; Extended Class-IV partial response; PR4 magnetic recording; block codes; coded sequence; finite state codes; low complexity; one-pairs constraint; partial response digital magnetic recording; quasi-catastrophic error propagation; timing recovery; upper bound; Block codes; Decoding; Digital magnetic recording; Error analysis; Intersymbol interference; Magnetic recording; Maximum likelihood detection; Signal processing; Timing; Upper bound;
Conference_Titel :
Global Telecommunications Conference, 1997. GLOBECOM '97., IEEE
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-7803-4198-8
DOI :
10.1109/GLOCOM.1997.644332
