Auto equalizer apparatus
阅读：762发布：2021-11-26
专利汇可以提供Auto equalizer apparatus专利检索，专利查询，专利分析的服务。并且Circuitry for detecting and measuring distortion components in a differentially coherent phase shift keyed signal received at a receiver after transmission over a transmission facility and further circuitry for altering the amplitude and phase of the received signal by an amount indicative of the measured value. The equalizer measures both pre and post pulse distortion products in producing the adjusted output signal. The disclosure also illustrates a special preamble which may be used prior to the main message to hasten the measurement and adjustment process time over the time required if random sampled data is used in the measurement process. The equalizer algorithm utilizes the fact that the phase and amplitude of prepulse and postpulse interference of any particular pulse can be measured relative to the main pulse by making the other interference pulses and the main pulse orthogonal.，下面是Auto equalizer apparatus专利的具体信息内容。
1. The method of measuring the distortion components of a signal introduced by a transmission facility after modulation of the signal, wherein the signal comprises a series of phase shifted data symbols, comprising the steps oF: modulating a transmitted carrier in a sequence of phase shifts representing a series of data bits, the sequence having a repetition period, wherein comparison of phase shifts of the signal, for each symbol in the sequence, with each of the other data phase shifts contributing distortion products of interest, produces an average comparison of zero; demodulating the received carrier to provide a first signal comprising a main component of a given data symbol and further distortion components supplied by other data symbols; separately adjusting said first signal in accordance with a characteristic of each of the data phase shifts of interest contributing distortion products to produce a plurality of second signals; and separately averaging each of said plurality of second signals over said sequence to obtain a plurality of third signals each indicative of the distortion component contributed by a given date symbol to said first signal as a result of the transmission facility.
2. The method of claim 1 comprising the additional step of removing from said first signal the distortion components as indicated by said third signal to provide an ''''equalized'''' fourth signal.
3. The method of measuring the distortion components in a transmitted DC-PSK data symbol which distortion components were contributed in a transmission facility by neighboring data symbols comprising the steps of: demodulating a received DC-PSK signal to produce a composite vector first signal (Zn) including I (real) and Q (quadrature) components of a main given and neighboring contributory data symbols; rotating said first signal according to the equation Sk Z(n)ej where Sk the distortion component contributed by a data symbol k symbols removed from the first signal data symbol occurring at sample period n, Beta k the phase increment between the data symbol occurring at n as transmitted and the data symbol as transmitted at time n-k which is contributing the component Sk, ej Beta k is indicative of the polar coordinate rotational angle for each of the data symbols contributing distortion components to said signal Zn; and separately averaging said Sk products for each component to obtain a plurality of distortion component vector values Sk .
4. The method of claim 3 comprising the additional step of removing from said Zn signal the distortion components Sk to provide an ''''equalized'''' signal Z''n.
5. Apparatus for measuring distortion components in a DC-PSK signal contributed in a transmission facility by data symbols neighboring a data symbol being demodulated comprising, in combination: first means for receiving a DC-PSK signal to be demodulated; demodulating means for demodulating DC-PSK signals connected to said first means for receiving a signal therefrom and supplying an output second signal indicative of a series of phase shifted data symbols, a particular data symbol indication including distortion contributions of time neighboring data symbols; first signal rotation means, including input, output, and control means for rotating a data symbol indication between input and output means thereof in response to a control signal supplied to said control means thereof; second signal rotation means, connected to said output means of said first signal rotation means, for separately, positively rotating the signal appearing at said output means of said first signal rotation means by an amount equal to the phase increment between the phase of the data symbol presently being received and the phase of each of the data symbols of interest contributing distortion components to the data symbol indication at said output means of said first signal rotation means; first averaging means, connected to said secoNd signal rotation means, for separately averaging the outputs of said second rotation means for each distortion contributing component of interest to provide a plurality of averaged values; third rotation means, connected to said averaging means, for negatively rotating each of the averaged values received from said averaging means by the angle of said positive respective rotation; first combining means connected to said third and first rotation means for adjusting the data symbol indication received from said first rotation means by a composite value obtained from said third rotation means to obtain an output third signal indicative of the phase increment of the presently received data symbol with respect to the previously received data symbol; and second means connecting said combining means to said control means of said first rotation means for supplying the control signal to control the rotation angle thereof.
6. Apparatus as claimed in claim 5 wherein said second means comprises an angle accumulator and wherein said apparatus comprises in addition: phase increment storage means connected to said combining means and said second and third rotation means for supplying phase increment information indicative of the rotational angle between the measured and distortion contributing data symbols to said second and third rotational means.
7. Apparatus as claimed in claim 5 wherein presymbol contribution to the data symbol being measured is minimized in said demodulating means wherein said demodulating means comprises, in combination: delay means for delaying the signal received from said first means by a times equal to one and three data symbols at first and second outputs thereof, respectively; negative fourth signal rotation means connected to said second output of said delay means and said control means of said first rotation means for negatively rotating the data symbol received from said delay means by an amount indicative of the received rotational control signal; second averaging means, connected to said fourth rotation means for averaging the outputs thereof to provide an output indicative of prepulse distortion; positive fifth rotation means for rotating the signal received from said first means by an angle indicative of the output signal from said second averaging means to produce a signal indicative of prepulse distortion; and second combining means for combining said signal received from said first output of said delay means with the signal obtained from said fifth rotation means for minimizing prepulse distortion in said output second signals supplied by said demodulating means.
8. The method of measuring the distortion in received differentially coherent phase shift keyed data symbols comprising the steps of: transmitting a series of data symbols phase modulated according to the sequence of +45* , - 135* , - 45* , + 135* , -135* + 45* , + 135* and -45* ; receiving and demodulating said modulated data symbols; rotating separately the demodulated presently received data symbols to an angle commensurate with the angle of each of a plurality of neighboring data symbols; and averaging each of the rotated data symbols in sets of specific data symbol rotations over at least one 8-data symbol sequence for measuring the phase distortion components contributed by each of said plurality of neighboring data symbols.
9. Apparatus for measuring the distortion components of a signal introduced by a transmission facility after modulation of the signal, wherein the signal comprises a series of data symbols of a given length, comprising, in combination: means for modulating a transmitted carrier in a prescribed sequence representing the series of data bits, the sequence having a repetition period, wherein comparison of bit representing symbols of the signal, for each symbol in the repetition period, with each of the other data bit symbols contributIng distortion products of interest, produces an average comparison of zero; means for demodulating the carrier to provide a first signal comprising a main component of a given data bit symbol and further distortion components supplied by other data bit symbols; means for separately adjusting said first signal, in accordance with a characteristic of each of the data bit symbols of interest contributing distortion products, to produce a plurality of second signals; and means for separately averaging each of said plurality of said second signals over said repetition period to obtain a plurality of third signals each indicative of the distortion component contributed by a given data bit symbol to said first signal as a result of a transmission facility.
10. The apparatus of claim 9 comprising in addition means for removing from said first signal the distortion components as indicated by said third signal to provide an equalized fourth signal.
11. Apparatus as claimed in claim 10 wherein the modulation is phase modulation of the differentially coherent-phase shift keyed type and wherein the adjusted characteristic is phase rotation.
12. Apparatus as claimed in claim 10 wherein said means for modulation includes means for phase modulation according to the sequence of +45* , - 135* , - 45* , + 135* 135* , +45* , + 135* and -45*; and said means for separately adjusting comprises means for rotating the phase of said first signal to the phase angle of the data bit symbols as originally demodulated by the apparatus.
13. The method of measuring the phase distortion components of a signal introduced by a transmission facility after modulation of the signal, wherein the signal comprises a series of data symbols, comprising the steps of: phase modulating a carrier over a prescribed period of time for transmission over a facility wherein the modulation represents a series of data symbols; demodulating the carrier to provide a first signal comprising a main component of a given data signal and further distortion components supplied by neighboring data symbols in the series; separately adjusting said first signal in accordance with the phase of each of the data symbols of interest contributing distortion components to produce a plurality of second signals; and separately averaging each of said plurality of second signals over a predetermined time period to obtain a plurality of third signals each indicative of the phase distortion component contributed by a given data symbol to said first signal as a result of the transmission facility.
14. The method of claim 13 comprising the additional step of removing from said first signal the distortion components as indicated by said third signals to provide an ''''equalized'''' fourth signal.
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