US4251886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transmission system for the transmission of data pulses
Assignee: US Philips Corp
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Filing: 1979-12-26
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Granted: 1981-02-17
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Expires: 1999-12-26
Abstract
Abstract A transmission system for the transmission of data pulses from a transmitter to a receiver through a transmission medium, the transmitter comprising a pulse source connected to the transmission medium for applying n-valent pulses to the transmission medium, which pulses, when passing through the transmission medium give rise to the occurrence of intersymbol interference, these pulses furthermore being affected by noise, wherein the receiver includes a pulse repeater, connected to the transmission medium, with quantized feedback.
Inventors
- 👤 Engel Roza
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:56
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/14; H04B3/141; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03012; H04L25/03114; H04L25/03127
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
359 words
A transmission system for the transmission of data pulses from a transmitter to a receiver through a transmission medium, wherein the transmitter comprises a pulse source connected to the transmission medium for applying n-valent pulses to the transmission medium, which pulses, when passing through the transmission medium give rise to the occurrence of intersymbol interference, these pulses furthermore being affected by noise, wherein the receiver comprises a pulse repeater, connected to the transmission medium, with quantized feedback, comprising a forward filter connected to the transmission medium, a difference former having a first input connected to the forward filter, a pulse regenerator connected to the output of the difference former, a clockpulse source for controlling the pulse regenerator, and a feedback filter connected between the output of the pulse regenerator and a second input of the difference former, wherein means are provided between the pulse source and the transmission medium, in the transmission medium itself and between the transmission medium and the forward filter such that a transmission channel having a uniform transmission characteristic is provided between the pulse source and the forward filter, which transmission channel may be limited between a lower cut-off frequency differing from zero and a higher cut-off frequency differing from infinity, characterized in that the forward filter and the feedback filter are implemented as recursive filters having three or more poles which are the same for both filters in the transfer functions H 1 (s) and G 1 (s) respectively, each of which being expressed as a quotient H.sub.1 (s)=N.sub.h (s)/D.sub.h (s) G.sub.1 (s)=N.sub.g (s)/D.sub.g (s) in which D h (s) is equal to D g (s) and the numerator polynomial N h (s) of the transfer function of the forward filter and the numerator polynomial N g (s) of the transfer function of the feedback filter are coupled by the group of K linear equations: N.sub.g (s.sub.k)=N.sub.h (s.sub.k) exp (s.sub.k τ) k=1, 2,. . . K wherein K exceeds two, wherein s k represents the poles of the transfer function, K represents the number of poles and τ represents the instant of time at which the regenerated pulse is applied to the feedback filter.
Claim 2
Dependent Claim
359 words
A transmission system for the transmission of data pulses from a transmitter to a receiver through a transmission medium, wherein the transmitter comprises a pulse source connected to the transmission medium for applying n-valent pulses to the transmission medium, which pulses, when passing through the transmission medium give rise to the occurrence of intersymbol interference, these pulses furthermore being affected by noise, wherein the receiver comprises a pulse repeater, connected to the transmission medium, with quantized feedback, comprising a forward filter connected to the transmission medium, a difference former having a first input connected to the forward filter, a pulse regenerator connected to the output of the difference former, a clockpulse source for controlling the pulse regenerator, and a feedback filter connected between the output of the pulse regenerator and a second input of the difference former, wherein means are provided between the pulse source and the transmission medium, in the transmission medium itself and between the transmission medium and the forward filter such that a transmission channel having a uniform transmission characteristic is provided between the pulse source and the forward filter, which transmission channel may be limited between a lower cut-off frequency differing from zero and a higher cut-off frequency differing from infinity, characterized in that the forward filter and the feedback filter are implemented as recursive filters having three or more poles which are the same for both filters in the transfer functions H 1 (s) and G 1 (s) respectively, each of which being expressed as a quotient H.sub.1 (s)=N.sub.h (s)/D.sub.h (s) G.sub.1 (s)=N.sub.g (s)/D.sub.g (s) in which D h (s) is equal to D g (s) and the numerator polynomial N h (s) of the transfer function of the forward filter and the numerator polynomial N g (s) of the transfer function of the feedback filter are coupled by the group of K linear equations: N.sub.g (s.sub.k)=N.sub.h (s.sub.k) exp (s.sub.k τ) k=1, 2,. . . K wherein K exceeds two, wherein s k represents the poles of the transfer function, K represents the number of poles and τ represents the instant of time at which the regenerated pulse is applied to the feedback filter.
Claim 3
Dependent Claim
158 words
A transmission system as claimed in claim 1, wherein the pulse response h(t) of the forward filter results in a minimum of the expression: ε.sup.2 (closed loop)+ρ·NS for a given value of the expression: ε.sup.2 (open loop) where: ##EQU10## representing the intersymbol interference at the input of the pulse regenerator, ##EQU11## representing the noise-signal ratio ##EQU12## representing the intersymbol interference at the output of the forward filter, where: h(t)=h(t)c(t), (convolution) h(t)=h(t)+r(t) where: ##EQU13## and where ρ is a constant enabling weighting of the influence of the intersymbol interference relative to the ambient noise and 2 V is the number of symbols which is significant for the intersymbol interference, ω L and ω H the cut-off frequencies of the transmission channel, N(ω) the noise power spectrum at the input of the forward filter and H(ω) the transfer function and h(t) the pulse response of the forward filter and r(t) a residual term representing the influence of the band limitation.
Claim 4
Dependent Claim
70 words
A transmission system for the transmission of pulses as claimed in claim 2, wherein the pulse response h(t) of the forward filter is developed towards a group of basic function φ m (t): ##EQU14## in which a m is determined from the group of M linear equations ##EQU15## where, ##EQU16## and where δ=ωN/s and λ is the Lagrange multiplier related to the constant c in the equation ε.sup. (open loop)=c.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |