-The multi-channel technique is a powerful scheme to improve the capacity of wireless network. CSMAC/CA based medium access protocols use carrier sense and RTS-CTS handshake to reduce the collisions of the share channel. In this paper, we propose a new MAC protocol for multi-hop ad hoc networks, which combines the CSMA/CA and Multi-channel techniques. And we call it Multiple Access with Collisi...

The 802.11 MAC protocol is widely used in wireless mesh networks. However, with multi-hop transmissions prevalent in such networks, neither the current 802.11 DCF basic scheme nor the RTS/CTS scheme can achieve full utilization of network capacity for various reasons. First, the 802.11 MAC provides low spatial reuse (low parallelism of transmissions). Second, the collision avoidance mechanism i...

The traditional layered approach to wireless networks (network, data link, and physical layer) utilizes suboptimally the limited available capacity. We propose a Quality of Service wireless framework based on the joint design of a packet fair queuing scheduler, demand-assignment Medium Access Control (MAC) protocol, and Multirate Multipath-Transparent CDMA-based physical layer. The unique code ...

The medium-access control (MAC) protocols for wireless networks proposed or implemented to date based on collision-avoidance handshakes between sender and receiver either require carrier sensing or the assignment of unique codes to nodes to ensure that intended receivers hear data packets without interference from hidden sources. We present and analyze a protocol that we call channel-hopping mu...

---------------------------------------------------------------------***----------------------------------------------------------------Abstract –Orthogonal Frequency Division Multiplexing (OFDM)is the promising candidate of a multiple carrier modulation technique because it does not require equalizers. OFDM is robust in adverse channel conditions and allows a high level of spectral efficiency....

Advances in wireless personal area networking p. 3 A comparative study of routing strategies for wireless sensor networks : are MANET protocols good fit? p. 5 Detecting disruptive routers in wireless sensor networks p. 19 Energy-efficient data dissemination in sensor networks using distributed dynamic tree management p. 32 Virtual coordinates with backtracking for void traversal in geographic r...

With the advent of IMT-Advanced, for the first time the target throughput obtained from wireless networks became comparable with wired counterparts. LTE and WiMAX have been the two main standards developed by 3GPP. The need to enhance the LTE and WiMAX has been driven by demand for higher spectral resources by the smart wireless devices in place of conventional phones. This transition from LTE ...

Wireless mesh networks (WMNs) which mediates the broadband Internet access, have been recently received many attentions by the researchers. In order to increase capacity in these networks, nodes are equipped with multiple radios tuned on multiple channels emerging multi radio multi-channel WMNs (MRMC WMNs). Therefore, a vital challenge that poses in MRMC WMNs is how to properly assign channels ...