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In next generation wireless networks along with the overwhelming demand of high data rate and network capacity, the user demands ubiquitous connectivity with the network. In order to fulfill the demand of anywhere at any time data services, the network operators have to install more and more base stations that eventually leads towards high power consumption. For this, the potential solution is derived...
Spectrum sensing is a key function of cognitive radio (CR) to identify the vacant frequency bands (which is also referred to as spectrum holes). The future technology of CR networks should be capable to scan wideband frequencies to increase spectrum utilization. To reduce high sampling rate for sampling wideband signal, Modulated Wideband Converter (MWC) is used for data acquisition. In this paper,...
The rapid progression in wireless networking has suggested dynamic spectrum allocation to increase spectrum utilization. Cognitive radio (CR) is a key technology to enable dynamic spectrum access. Spectrum sensing provide spectrum awareness to CR system. Although energy detection (ED) is commonly used for spectrum sensing method, it gives poor performance under low noise environment and also suffers...
WiMAX is a wireless technology that was developed to overcome the limitations of wireline networks to meet the needs of Broadband Wireless Access (BWA) services to customers. As standardized, fixed WiMAX uses OFDM as its physical air interface. Therefore, it also suffers from high PAPR. To solve this problem, Partial Transmit Sequence (PTS) is used in this paper due to its better performance among...
Spectrum sensing is a key function of cognitive radio (CR) to identify the vacant frequency bands (which is also referred to as spectrum holes). The future technology of CRs should be capable to scan wideband frequencies to increase spectrum utilization. This paper investigates a wideband spectrum sensing technique based on energy detection in frequency domain using Welch periodogram. The signal of...
The synthesis and electromagnetic wave absorbing characterization of La1−yBayMnO3 (y = 0−1, 0) magnetic material through a mechanical milling process have been performed. The La1−yBayMnO3 (y = 0−1, 0) magnetic material was made from La2O3, BaCO3, dan MnCO3 materials. The mix was milled for 10 hours and then sintered at 1000 oC for 10 hours. The results of the the hysteresis curve indicated that that...
The main idea of Cooperative Spectrum Sensing (CSS) is to improve detection performance. Each Secondary User (SU) shares sensing information to collect data of the unused bands. One technique to detect those frequency bands is energy detector. This technique uses the threshold level to minimize spectrum sensing error in Cognitive Radio (CR) system. Proper selection of the threshold level results a...
Cooperative spectrum sensing (CSS) is capable to improve the performance of signal detection. It is one solution to overcome fading, shadowing, and uncertainty noises. Unlike centralized networks, Secondary User (SU) in decentralized networks independently senses license channel without forwarding the sensing result to central coordinator. This paper investigates the performance of Decentralized Multiuser...
The design of optimal sensor operating point in physical layer by considering the impact of the throughput performance in MAC layer is crucial issue. Spectrum sensing action must be performed as quickly as possible to obtain a good throughput performance. However, quick sensing makes the fidelity of sensing outcome becomes low. On the other hand, a long sensing time leads to the low throughput performance...
Spectrum sensing over imperfect channel condition can cause errors in primary signal detection. False alarm detects idle states as a busy channel and makes secondary user (SU) refrain from data transmission, while miss-identification detects busy states as an idle channel and causes collision to primary user (PU). This paper study the performance of opportunistic spectrum access (OSA) system over...
Ubiquitous communication networks is a keystone for New Generation Network (NWGN). Mobile Wireless Communication Networks (MWSN) is a viable solution to accomplish the requirements of NWGN. Due to mobility of sensor nodes, the data reliability and end-to-end delay with energy efficiency in the network is an enormous concern. Various real-time and delay sensitive applications enforced to use both environments...
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