Axioms of this era - the next unsolved problems Print E-mail
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Written by Владимир Гарбузов   
Friday, 02 May 2008


The text of the original in Russian

 The most «harmful» impediment is the radio noise. His distorting effect can only reduce, but can not get rid of it. An indicator of the impact of a method of processing a mixture of signal and noise is achieved otnosheniet signal to noise ratio at the output of the device processing. Target opimizatsii how to handle in the above sense is the main task of the theory and practice of radio. 
      In radar and radio communication of fundamental importance to coherent signal with a linear filter (matched filter). Of particular importance matched filter is that it provides the maximum possible signal to noise ratio at its output when subjected to input signal and an additive mixture of white noise. This makes it an optimal linear filter under various optimality criteria. 
It is considered axiomatic to assert that given the power and signal power spectral density of white Gaussian noise signal to noise ratio achieved on a mixture of matched filter is the limit and further increase its processing 

output mixture impossible.





A method of processing a mixture of matched filter output, which makes the above axiom is not true. Proof of this can be a stress block, obtained by modeling the processing of the output mixture agreed with the CFM video filter (Fig.1-4). 

        Figure 1 shows the implementation of the output voltage matched filter obtained in one of the many experiments in the absence of noise, and 
        in figure 2 - the same realization after it developed a way of processing. 
        In Fig.3 is shown the realization of a mixture of signal and noise at the output of matched filter, and 
        in Fig.4 - the same realization after it developed a way of processing. 

        The conclusion is obvious! 

     In the radar will allow the implementation of development at the same power to increase the maximum range of the radar and accuracy of measurement of coordinates lotsiruemyh their facilities, either within the same range radar - lower power transmitters. Lower power transmitters will provide great economic benefit, reduce the cost of radar and their size, would substantially improve the conditions for the operation of the radar. 

      In radio, television, radio, mobile communication exercise will lead to an increase in the development of the range quality reception with the same power level, or to decrease power and reduce the required number of repeaters. Lower power transmitters would, moreover, reduce the size of mobile phones and radios. 

      With the same positive effects of particular value would be the development of space radio. 

       Computer simulation of the processing of the output filter, a coherent mixture of the proposed method showed that, firstly, to improve the relationship with / sh can be used to receive any information signal transmission systems. Secondly, the effect of improving relations with the / sh depends on the signal, and this effect is the greater, the wider the base of the signal. 

       For the technical implementation of the proposed method does not require radical changes in the functional scheme of the receiver and the large capital investment. Refinement of the receiver will be only in the introduction of a coherent chain of functional devices to a new device. Schematic diagram of the new device is simple enough, but to its constituent elements are not subject to special requirements. The scheme can be fully implemented on the elements of digital technology, which is in line with the spirit of the time. This unit will be located at the end of the linear part of the receiver followed by matched filter. 

      Technical realization of the development owing to its diversity involves contact with a large number of manufacturers of radio systems and solutions with them complex problems of interaction. This requires a person or entity that wishes to take over these functions. With such a sponsor is willing to share the rights for the development of a treaty drawn up accordingly.
 

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