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Method for recognizing digital information in transmission in mobile radio communications systems
| Details |
Inventors: Gupta, Probodh D.;
Assignee: Siemens Aktiengesellschaft (Berlin & Munich, DE)
Primary Examiner: Safourek; Benedict V.
Assistant Examiner:
Attorney, Agent or Firm: Hill, Van Santen, Steadman & Simpson
In a method for recognizing digital information, particularly in an information transmission in a mobile radio communications system, in which a sampling pulse is derived from the digital information available at the receiver, preferably from a whole multiple of the information clock frequency, and in which a sampling time is placed into the respective area of an information element in which the pulse to be sampled which represents the information element assumes its suspected, quasi-stationary state, at least one further, non-correlated sampling pulse is drived from the received information, the further pulse having a further whole multiple of the information clock frequency. The edges of the further sampling pulse are placed at a corresponding number of sampling times within a further extended sampling range of the pulse representing the information element. A respective comparison of the sampling results is carried out for an information element and a majority decision is undertaken on the basis of existing sampling results. The first sampling result and all signals obtained from the various majority decisions are subjected, variously weighted, to a further majority decision to obtain a signal which is supplied to an information sink. |
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DETAILED DESCRIPTION I claim: 1.
A method for recognizing digital information of a digital information element in a clocked digital information transmission, comprising the steps of: first, sampling the information element at a first multiple of the information clock frequency to derive a first sampling result representing the content of the information element at a time in which the information element is assumed to be in its quasi-stationary state; then, sampling the information element at least one more time at a respective different multiple of the information clock frequency within the assumed quasi-stationary state of the information element to obtain a respective additional sampling result; conducting a first majority decision for each of the additional sampling results; weighting the first sampling result and the majority decision results; and conducting a second majority decision for the weighted results to obtain a signal representative of the content of the sampled information element.
2.
Apparatus for recognizing digital information of a digital information element in a clocked digital information transmission modulated on a carrier, comprising: an antenna for receiving the information transmission; a carrier frequency generator; a demodulator connected to said antenna and to said carrier frequency generator for demodulating the digital information; a sampling device connected to said demodulator and operable to produce first and additional pulses corresponding to at least first and second multiples of the information clock frequency and; a plurality of evaluation circuits connected to said demodulator and to said sampling device for evaluating the information element with the respective sample pulses; at least one first majority decision stage connected to each of said evaluation circuits except that comparator which receives the first sample pulse and operable to perform a majority decision for each; and a second majority decision stage connected to said comparator for the first sample pulse and to each first majority decision stage, including weighting means for weighting each signal it receives, for providing a majority decision output signal representing the content of the sampled information element
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