scholarly journals Modeling of cognitive radio system for the improvement of spectrum utilization

2018 ◽  
Vol 7 (3.3) ◽  
pp. 231
Author(s):  
Meena M ◽  
Monish M ◽  
Sharanya C ◽  
Dr V Rajendran
Keyword(s):  
Dynamic Spectrum Access ◽  
Chain Process ◽  
Continuous Time Markov Chain ◽  
Spectrum Access ◽  
Mac Layer ◽  
Spectrum Utilization ◽  
Radio System ◽  
Network Applications ◽  
Proposed Model ◽  
Layer Technique

It’s well inferred that the MAC layer technique on wireless network is well established and many scientists elaborately worked on this technique till the updated 5G technology. However, the present study clearly says on spectrum-based parameters are becoming very popular and cognitive defined systems are found to be near best solution for many communication network applications. Hence this paper provides to develop an algorithm and policy engine makes a details model and study on dynamic spectrum access in cognitive system using continuous time Markov chain process. The detailed and outcome of results clearly shows a 96% of efficiency on the spectrum dynamics which came from our unique proposed model.  

Energy Optimization in Wireless Sensor Networks under Dynamic Spectrum Access Using Adaptive Listening

2020 ◽  
Vol 14 ◽  
Author(s):  
Mumtaz Ahmed ◽  
MN Doja ◽  
Mohd Amjad
Keyword(s):  
Wireless Sensor Networks ◽  
Energy Consumption ◽  
Dynamic Spectrum Access ◽  
Mac Protocol ◽  
Dynamic Spectrum ◽  
Wireless Sensor ◽  
Spectrum Access ◽  
Mac Layer ◽  
Bandwidth Utilization ◽  
Proposed Model

: Efficient use of energy consumption in WSNETs is one the most promising area for researchers. In such networks a considerable amount of bandwidth and energy is wasted for sensing the communication over the common channels. To recognise these complications, such WSNETs offers dynamic allocation of the spectrum to optimise the bandwidth utilization. S-MAC protocol which is based upon Time Division Multiple Access technique have already been proven as a better protocol for the efficient use of energy at MAC Layer. We revised all the patents related to the energy issues in Wireless Sensor Networks. Hidden terminal problem is a well-known problem in wireless networks due to which the performance of the single channel medium access protocols is affected. An adaptive listening technique at the MAC Layer was exploited under Dynamic Spectrum Access to address the issue. The adaptive listening proposes a dynamic sleep/idle period based on the data transmission pattern. Thus the S-MAC protocol further improves the performance in terms of energy consumption and bandwidth utilization at the MAC Layer. The performance of this proposed model is compared with other protocols like IEEE 802.11 and SMAC with periodic sleep. The proposed model offers better network throughput and better energy consumption as seen from these simulations results under various parameters.

scholarly journals Investigation of Radio Frequency Licensed Spectrum Utilization in Nigeria: A Study of Rumuokwuta, Port Harcourt, Nigeria

2021 ◽  
Vol 13 (05) ◽  
pp. 31-41
Author(s):  
Nkwachukwu Chukwuchekwa ◽  
Enwume Joshua U ◽  
Longinus S. Ezema ◽  
Cosmas K Agubor
Keyword(s):  
Radio Frequency ◽  
Dynamic Spectrum Access ◽  
File Format ◽  
Spectrum Access ◽  
Spectrum Utilization ◽  
Spectrum Occupancy ◽  
High Rise ◽  
Average Spectrum ◽  
Port Harcourt ◽  
Data Points

This study was carried out to investigate the spectrum utilization of the licensed Radio Frequency (RF) spectrum in Rumuokwuta, Port Harcourt. An outdoor measurement of spectrum occupancy was carried out in a high-rise building situated at Rumuokwuta urban area in Port Harcourt, Nigeria using RF explorer spectrum analyzer and a personal computer laptop system. Spectrum activities in the band of 240-960 MHz were monitored for 24 hours. The frequency band was subdivided into 24 sub bands each with a span size of 30 MHz. Scanning of bands was made efficient using a python script that scans a range, analyzed the frequencies and signal strengths for 112 data points, saves data in CSV file format, scans the next range until the 24 ranges were scanned. The process was repeated to achieve 15 iterations. With a noise floor of - 110dBm, a threshold of -95dBm was used to determine the presence of signal, hence the spectrum occupancy of measured bands. Results showed that out of the 24 investigated sub bands; only one band was completely occupied with spectrum occupancy of 100%. 12 bands were partially occupied while 11 were completely free. The average spectrum occupancy for the whole band was obtained as 11.64%. This showed good location for dynamic spectrum access and cognitive radio deployment, especially in Television White Space (TVWS).

Dynamic Spectrum Access Based on MAC-Layer Spectrum Sensing and Prior Channel Pre-Allocation Strategy

2010 ◽  
Vol E93-B (3) ◽  
pp. 609-619 ◽  
Author(s):  
Yanzan SUN ◽  
Honglin HU ◽  
Fuqiang LIU ◽  
Ping WANG ◽  
Huiyue YI
Keyword(s):  
Spectrum Sensing ◽  
Dynamic Spectrum Access ◽  
Dynamic Spectrum ◽  
Spectrum Access ◽  
Allocation Strategy ◽  
Mac Layer
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