The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
One of major drawbacks of transform domain communication system (TDCS) is the high peak-to-average power ratio (PAPR) of the transmitted signal. A novel method named magnitude weighting selection (MWS) for PAPR reduction in TDCS is proposed. The method is based on multiplying used subcarriers by magnitude weights which are determined by the modified backtracking search optimisation algorithm. The...
Cooperation can improve the performance of spectrum sensing by taking advantage of diversity gains. However, in the process of cooperative spectrum sensing, malicious users could send false local sensing results to the fusion center, which can cause severe distortion to the final sensing decision. To improve the immunity of cooperative spectrum sensing against false sensing information, we propose...
Ubiquitous communication indeed requires a seamless networking deployment enable user access the Internet and receive particular service at anytime. However, the deployment of wireless device and service source for ubiquitous communication is a dynamic complex problem which a typical multiple objectives decision problem. In this research, a general model is proposed to deal with such ubiquitous networking...
Spectrum sensing is important for cognitive radios to utilize the idle spectrum opportunities, and recently cooperation schemes have been introduced to enhance spectrum sensing in specific areas. However, when a mobile cognitive node roams among heterogenous wireless network, it will be difficult to catch the changes of primary user's behavior, or to setup the cooperation relationship with local network...
Though hierarchical modulation offers an important coverage and throughput tradeoff for wireless communications, it has received relatively little attention to date. Traditional hierarchical modulation suffers from the interference between layers, which results in both capacity loss and bit-error rate increasing. In this paper, an enhanced hierarchical modulation technique along with four optimization...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.