Overlapped Transmission in Wireless Ad hoc Networks
In wireless ad hoc networks that do not employ code-division multiple access, medium access control (MAC) protocols are used to allocate the channel to specific transmitters and receivers, typically to the exclusion of all other users within the interference ranges of the transmitters and receivers. A few authors have proposed the use of multiuser detection (MUD) or dirty paper coding (DPC) to allow transmissions in an ad hoc network to occur simultaneously, even when the transmissions cause interference to each other. However, such proposals usually assume that the MUD or interference cancellation (IC) schemes can completely excise the interference without knowing the interfering signals. We consider a more practical approach in which multiple transmissions are allowed only when the information in the interfering signal is known at the receiver and thus simpler MUD schemes can be applied. This may often occur in ad hoc networks because multihop routing causes the information that was transmitted by a node to be transmitted later by one of that nodes neighbors. We call this approach overlapped transmission.The restriction that the interference is known places some limits on when the MUD techniques can be applied. We investigate these limits for random networks with non-fading channels. We then propose a simple protocol for scheduling overlapped transmissions and investigate its performance.
Surendra Boppana John M.Shea
Wireless Information Networking Group Department of Electrical and Computer Engineering University of Florida
国际会议
2006 International Conference on Communications,Circuits and Systems(第四届国际通信、电路与系统学术会议)
广西桂林
英文
1309-1314
2006-06-25（万方平台首次上网日期，不代表论文的发表时间）