Demodulator with selectable coherent and differential data

Pulse or digital communications – Receivers – Angle modulation

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375279, 375308, 375325, 375329, 375330, 329304, 455143, H04L 2714

Patent

active

055530982

ABSTRACT:
A selectable demodulator (32) operates in the phase domain to implement a coherent demodulation path (40) and a differentially coherent demodulation path (42). The coherent path (40) includes a differential encoder circuit (46) to produce coherently demodulated differential data. Magnitude converters (62, 62') convert phase errors in each path into magnitude values. A comparison circuit (66) compares magnitude values from the two paths (40, 42) and selects the path encountering the least phase error. A selection circuit (60) provides data codes demodulated in accordance with the selection.

REFERENCES:
patent: 4290140 (1981-09-01), Malm
patent: 4438524 (1984-03-01), Muilwijk
patent: 4818931 (1989-04-01), Naegeli et al.
patent: 4933958 (1990-06-01), Brandl et al.
patent: 5007068 (1991-04-01), Simon et al.
patent: 5097220 (1992-03-01), Shimakata et al.
patent: 5121070 (1992-06-01), Tomita
patent: 5311545 (1994-05-01), Critchlow
patent: 5377229 (1994-12-01), Wilson et al.
N. Liskov and R. Curtis "Performance of Coherent Phase and Amplitude Digital Modulaitions with Carrier Recovery Noise" IEEE Transactions on Communications, vol. Com-35, No. 9, Sep. 1987.
Justin C.-I. Chuang "Comparison of Coherent and Differential Detection of BPSK and QPSK in a Quasistatic Fading Channel" IEEE Transactions on Communications, vol. 38, No. 5, May 1990 p. 565.
M. Simon and D. Duvsakar "Doppler-Corrected Differential Detection of MPSK" IEEE Transactions of Communications, vol. 37, No. 2, Feb. 1989.
P. Ho and D. Fung "Error Performance of Multiple-Symbol Differential Detection of PSK Signals Transmitted Over Correlated Rayleigh Fading Channels" IEEE Transactions on Communications, vol. 40, No. 10 Oct. 1992.
D. Divsalar and M. Simon "Multiple-Symbol Differential Detection of MPSK" IEEE Transactions on Communications, vol. 38, No. 3, Mar. 1990.
M. Fitz and W. Lindsey "Decision-Directed Bust-Mode Carrier Synchronization Techniques" IEEE Transactions On Communications, vol. 40, No. 10, Oct. 1992.
J. Proakis, P. Drouilhet and R. Price "Performance of Coherent Detection Systems Using Decision-Directed Channel Measurement" IEEE Transactions Communications, Mar. p. 54.
A. Aghamohammadi, H. Meyr and G. Ascheid "Adaptive Synchronization and Channel Parameter Estimation Using an Extended Kalman Filter" IEEE Transactions Communications, vol. 37, No. 11, Nov. 1989.
T. Alberty and V. Hespelt "A New Pattern Jitter Free Frequency Error Detector" IEEE Transactions on Communications, vol. 37, No. 2, Feb. 1989.
Pooi Yuen Kam "Maximum Likelihood Carrier Phase Recovery for Linear Suppressed-Carrier Digital Data Modulations" IEEE Transactions on Communications, vol. Com-34, No. 6, Jun. 1986.

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