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.
In this paper, we propose a new definition of energy efficiency with respect to a given target packet error rate (PER). It is shown that some previous reported definitions are actually special cases of our definition. Consequently we use the definition to analyze the energy efficiency of Multilevel quadrature amplitude modulation (MQAM) and find that for a specific transmission there exists an energy...
To improve the efficiency of field test, a new integrated wireless test ring (T-Ring) system is planned to be established. In this system, the cell radius will be proportionally reduced. To study the vertical handoff between WLAN and cellular networks of the T-Ring system, we need to analyze vertical handoff quantitatively. Based on the analysis result, the corresponding parameters will be adjusted...
In multi-source multi-relay wireless network, centralized relay selection schemes are difficult to realize because they usually require global information, which is hardly available due to the limited memory and latency in realistic systems. Meanwhile, in classical distributed relay selection schemes, each source selects its ??best?? relay merely based on the local channel information. However, such...
Many measurement studies showed that network traffic usually exhibits self-similar nature, meanwhile, wireless fading channels lead to the time-variant service rates of network nodes. Compared with classical queuing systems with Markov sources or constant service rates, the queuing system with self-similar input in a wireless fading channel is more complicated, and it is very difficult to obtain closed-form...
In this paper, we propose a multi-users cooperative communication scheme based on the network coding in GF(2n). Through changing the implementation of network coding and designing the proper coding coefficients, this network-coded cooperation in GF(2n) (NCCG) can improve the solvability of decoding set of equations in the receiver effectively and make full use of the advantages taken by network coding...
This paper presents a novel network coding (NC) medium access control (MAC) protocol design, named NC-ALOHA. The basic idea of NC-ALOHA is completing the network coding process during one packet per slot at each transmitting terminal; the network coding coefficient vectors used by different transmitting terminals are orthogonal with each other. By virtue of network coding, traditional collision assumption...
A new sub-optimal subcarrier allocation algorithm named "ratio-based selection" (RBS) is proposed. In multiuser OFDM system, almost all present sub-optimal allocation algorithms which allocate subcarriers according to the "best channel gain" rule will allocate some subcarriers to the users who are in deep fading. However RBS algorithm avoids this situation by allocating subcarriers...
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.