Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1994-11-10
1996-04-30
Tse, Young
Pulse or digital communications
Receivers
Interference or noise reduction
H03H 1702, H03H 1706
Patent
active
055132235
ABSTRACT:
An FIR digital filter of which impulse response S(t) meets an equation, S(t)=H(t)exp(j.omega.t), where H(t) represents roll off characteristics and .omega. is an arbitrary frequency. The filter includes a data storing device for delay storing real and imaginary number data of a plurality of binary complex input data, a coefficient storing device for storing real and imaginary number coefficients corresponding to s(0), s(1), . . . , s((N-1)/2) when N is an odd number, or s(0), s(1), . . . , s(N/2-1) when N is an even number. Where s(0) to s(n-1) represent an impulse response string. The filter also includes a reversible counting and reading out device for reading the real and imaginary number coefficients stored in the coefficient storing device in order of s(0), s(1), . . . , s((N-1)/2) ) at a first order and s((N-3)/2) ) , . . . , s(1), s(0) next at a second order when N is an odd number, or in order of s(0), s (1), . . . , s(N/2-1) ) at a first order and s(N/2-1) ) , . . . , s (1), s(0) next at a second order when N is an even number. The filter also includes a sign control device for inputting the imaginary number coefficients read out and reversing sign of the imaginary number coefficients that were read out at the second order. The filter also includes a sum of products operation device for calculating sums of products for the binary complex input data input from the data storing device, the coefficient storing device and the sign control device.
REFERENCES:
patent: 5287299 (1994-02-01), Lin
patent: 5301134 (1994-04-01), Maruyama
NEC Corporation
Tse Young
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