Apparatus for receiving and recovering frequency shift keyed...

Details Apparatus for receiving and recovering frequency shift keyed... Apparatus for receiving and recovering frequency shift keyed...

2008-05-20

2008-05-20

Fan, Chieh M. (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S341000, C375S223000, C375S227000, C375S130000, C375S219000, C375S316000, C375S365000, C455S221000, C455S208000, C455S214000, C455S227000, C370S252000, C370S342000

Reexamination Certificate

active

07376207

ABSTRACT:
A receiver architecture for receiving an FSK signal having a predetermined number of modulation levels includes a selectivity filter (206) for selectively passing a wanted channel and rejecting unwanted channels. The selectivity filter has a filter bandwidth of about one-half the bandwidth of a pre-modulation filter in a transmitter sending the FSK signal. A discriminator (208) is coupled to the selectivity filter for demodulating the signal. A symbol recovery processor (210) is coupled to the discriminator for recovering the symbols through a maximum likelihood sequence estimation (MLSE) technique utilizing N states for each symbol time, wherein N equals the predetermined number of modulation levels, and wherein templates used in the MLSE for symbol transitions are optimized with a bandwidth substantially less than the bandwidth of the pre-modulation filter.

REFERENCES:
patent: 5377229 (1994-12-01), Wilson et al.
patent: 6487240 (2002-11-01), Chen
patent: 6647070 (2003-11-01), Shalvi et al.
Yasunori Iwanami, “Performance of Sequence Estimation Scheme of Narrowband Digital FM Signals with Limiter-Discriminator Detection,” IEEE Journal on Selected Areas in Communication, pp. 310-315, Feb. 1995, USA.
B. Rohani and K.S. Chung, “Combined MLSE/Frequency Discriminator Detection of the GSM Signal,” IEEE VTC, pp. 419-432, 1998, USA.

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