World Journal of Engineering Research and Technology (WJERT) has indexed with various reputed international bodies like : Google Scholar , Index Copernicus , Indian Science Publications , SOCOLAR, China , International Institute of Organized Research (I2OR) , Cosmos Impact Factor , Research Bible, Fuchu, Tokyo. JAPAN , Scientific Indexing Services (SIS) , Jour Informatics (Under Process) , UDLedge Science Citation Index , International Impact Factor Services , International Scientific Indexing, UAE , International Society for Research Activity (ISRA) Journal Impact Factor (JIF) , International Innovative Journal Impact Factor (IIJIF) , Science Library Index, Dubai, United Arab Emirates , Scientific Journal Impact Factor (SJIF) , Science Library Index, Dubai, United Arab Emirates , Eurasian Scientific Journal Index (ESJI) , Global Impact Factor (0.342) , IFSIJ Measure of Journal Quality , Web of Science Group (Under Process) , Directory of Research Journals Indexing , Scholar Article Journal Index (SAJI) , International Scientific Indexing ( ISI ) , 

World Journal of Engineering
Research and Technology

( An ISO 9001:2015 Certified International Journal )

An International Peer Reviewed Journal for Engineering Research and Technology

ISSN 2454-695X

Impact Factor : 5.924

ICV : 79.45

News & Updation

  • Article Invited for Publication

    Article are invited for publication in WJERT Coming Issue

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    WJERT Rank with Index Copernicus Value 79.45 due to high reputation at International Level

  • WJERT New Impact Factor

    Its our Pleasure to Inform you that WJERT Impact Factor has been increased from  5.549 to 5.924 due to high quality Publication at International Level


    JANUARY 2022 Issue has been successfully launched on 1 January 2022.

  • New Issue Published

    Its Our pleasure to inform you that, WJERT 1 January 2022 Issue has been Published, Kindly check it on




Er. Priyanka Dayal*


Cognitive radio network is an emerging field in communication and are giving benefits in various areas. It provides efficient utilization of frequency spectrum and spares bandwidth for other applications. There are various parameters in wireless communication that need improvement for reliable processing of system. The cooperative communication improves the network performance, energy efficiency, network throughput and many more. There are various protocols that are used for cooperative diversity such as amplify and forward, decode and forward, coded cooperation and so on. In this paper, amplify and forward relaying protocol for cognitive radio network is proposed. The data is communicated between transmitter and receiver by using 3-hop and cognitive relays are used accordingly. The encoding of information is done by space time block codes over two different channels such as Additive White Gaussian Noise channel and Rayleigh fading channel. The presence or absence of primary user is detected by using spectrum sensing technique. In this paper, energy detector sensing technique is used to detect the availability of the spectrum because of the less complexity of this system. The results are simulated by using MATLAB software.

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