Method and apparatus for symbol timing tracking

Details Method and apparatus for symbol timing tracking Method and apparatus for symbol timing tracking

1995-11-03

1997-08-05

Kuntz, Curtis

Pulse or digital communications

Synchronizers

Synchronizing the sampling time of digital data

36472404, 327142, 375226, H04L 700, H04B 346, H04B 1700

Patent

active

056549890

ABSTRACT:
An apparatus and method for symbol timing tracking has a decimation index input (42). The decimation index (42) is connected to an upper threshold limiter (44) and a lower threshold limiter (46). The upper threshold limiter (44) is connected to an upper shift register (48). A plurality of cells (52) in the upper shift register (48) are connected to a majority vote logic circuit (54). The majority vote logic circuit (54) is connected to a symbol clock time base (56) and a clocking and clearing control circuit (62). The clocking and clearing control circuit (62) has a clock enable output and a clear signal connected to the upper shift register (48). The lower threshold limiter (46) is connected to a lower shift register (58) that is connected to a second majority vote logic circuit (60).

REFERENCES:
patent: 4633193 (1986-12-01), Scordo
patent: 5204879 (1993-04-01), McConnell
patent: 5383188 (1995-01-01), Shigemoto
patent: 5528634 (1996-06-01), Griph et al.
patent: 5535252 (1996-07-01), Kobayashi
Sollenberger, Nelson R. et. al., "Low-Overhead Symbol Timing and Carrier Recovery for TDMA Portable Radio Systems", IEEE Transactions on Communications, vol. 38 No. 10, pp. 1886-1892, dated Oct., 1990.
Chuang, Justin C. I. et al. "Burst Coherent Demodulation with Combined Symbol Timing, Frequency Offset Estimation, and Diversity Selection", IEEE Transactions on Communications, vol. 39 No. 7, pp. 1157-1164, dated Jul. 1991.

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