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Scheduling based on random linear network coding is an effective way of improving system performance in a wireless network. In a time-varying channel environment, it is important to take the effects of outdated channel-state information (CSI) into consideration when scheduling because the CSI used may be different from the real CSI for data transmissions due to mobility and feedback delays. Here,...
A hidden-node problem is one of the major challenges that cause severe performance degradation in wireless ad-hoc networks. Even though RTS/CTS (Request To Send/Clear To Send) exchange can remove the hidden-node problem, the inefficiency of exchanging the RTS/CTS has brought attentions to many researchers. While most of these efforts have been focused on the theoretical analysis, very little efforts...
Hidden nodes cause unexpected collisions and interferences in mobile ad-hoc networks (MANETs). However, little attention has been given to the behavior of hidden nodes, especially when channels are under random bit errors. Exchanging RTS/CTS can avoid hidden node problems. However, undesirable overheads in every packet cause performance degradation, and this motivates many researchers to design new...
We consider a simple downlink code division multiple access (CDMA) system in which user signals are transmitted in a single-frequency network (SFN) channel. The SFN channel has always been a problem in mobile communication or broadcasting channel due to its huge delay spread. Generally, we suffer from multiple access interference (MAI) caused by the multipath channel and MAI becomes worse when the...
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