Transversal filter with wide band phase shifters in series with

Details Transversal filter with wide band phase shifters in series with Transversal filter with wide band phase shifters in series with

1989-02-08

1991-06-18

Lee, Benny T.

Wave transmission lines and networks

Coupling networks

Time domain filters

375 15, H03H 1500, H04B 314

Patent

active

050252348

ABSTRACT:
A transversal filter comprising: a series connection of M+L delay cells (12) defining M+L+1 signal samples; M+L+1 branches each having a midpoint connected to receive a respective one of said signal samples and first and second multipliers (10, 11) for multiplying its signal sample by respective first and second coefficients; and first and second summing circuits (13, 14) respectively connected to sum the outputs from said first multipliers (10) and from said second multipliers (11), wherein a wideband phase shifter (17) is associated in series with each delay cell (12), said phase shifter providing a phase shift .delta..phi. such that .delta..phi.=.OMEGA..sub.0 T (modulo 2.pi.) where .OMEGA..sub.0 is the angular frequency of the intermediate carrier and T represents the duration of the delay due to a delay cell (12).

REFERENCES:
patent: 3366955 (1968-01-01), Mattern
patent: 4210882 (1980-07-01), Roza et al.
patent: 4594725 (1986-06-01), Desperben et al.
patent: 4607377 (1986-08-01), Atobe et al.
"Egaliseurs Auto-Adaptatifs en Bande de Base Pour Faisceaux Hertziens Numeriques (1)", Par. O. de Luca, Division Faisceaux Hertziens de Thompson-CSF, Revue Technology Thompson-CSF, vol. 16, N*1, Mar. 1984.
Archiv Fur Elektronik und Ubertragungstechnik, vol. 25, No. 3, Mar. 1971, pp. 155-159, Stuttgart, DE. P. Leuthold.
6 GHz 135MBPS Digital Radio System with 64 Qam Modulation, pp. F2.4.1-F2.4.6, T. Noguchi et al., Microwave & Satellite Comm. Div., C&C System Research Labs.

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