Abstract




 
   

IJE TRANSACTIONS A: Basics Vol. 32, No. 4 (April 2019) 548-554    Article in Press

PDF URL: http://www.ije.ir/Vol32/No4/A/12-3052.pdf  
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  SECRECY OF COMMUNICATIONS IN DATA TRANSMISSION BY IMPULSES WITH UNKNOWN MOMENTS OF APPEARANCE AND DISAPPEARANCE
 
O. V. Chernoyarov, M. M. Shahmoradian, M. Marcokova and Y. E. Korchagin
 
( Received: October 07, 2018 – Accepted: March 07, 2019 )
 
 

Abstract    We carried out a comparative analysis of the algorithms for detecting a rectangular impulse against Gaussian white noise under either authorized or unauthorized access to the transmitted data. We presupposed that for data transmission the binary communication system is used and that the useful information in the data is whether the signal is present or absent. The case is that unauthorized access by the outsider takes place in the situation when the signal parameters are completely or partially unknown. We then define the degree of the transmitted data secrecy by the secrecy ratio determining how highly the threshold signal-to-noise ratio increases when there is the unauthorized access instead of the authorized one.

 

Keywords    Rectangular Impulse; Signal Detection; Authorized Access; Unauthorized Access; Threshold Signal-to Noise Ratio; Error Probabilities

 

چکیده   

در این کار تجزیه و تحلیل مقایسه ای از الگوریتم های تشخیص پالس مستطیلی در پس زمینه نویز سفید گاوسی در زمان اجرای دسترسی مجاز و غیر مجاز به اطلاعات منتقل شده انجام شده است. فرض بر این است که در واقع اطلاعات منتقل شده در وجود یا عدم وجود سیگنال خلاصه میشود. مساله این است که دسترسی غیرمجاز بوسیله بیگانه، در شرایطی اتفاق می افتد که پارامترهای سیگنال به طور کامل یا جزئی ناشناخته هستند. سپس درجه پوشیدگی اطلاعات منتقل شده، بوسیله نرخ پوشانندگی تعریف میشود که مشخص میکند آستانه نسبت سیگنال به نویز وقتی که به جای دسترسی مجاز، دسترسی غیر مجاز وجود دارد افزایش پیدا میکند.

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