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Title Sink Capacity and Antenna Beamforming of Wireless CDMA Sensor Networks
Degree Ph.D.
Author Hyunduk Kang
Advisor Kiseon Kim
Graduation Date 2006.02.24 File
    Date 2013-09-11 20:47
Wireless sensor networks (WSNs) are one of fast growing and fascinating research
areas that have been discussed in extensive literature in communications and engi-
neering ?elds. WSNs can be used in a wide spectrum of applications, ranging from
monitoring environmental characteristics, to home networking, medical applications,
ubiquitous computing environments, and so on. Two important operations in WSNs
are data dissemination, i.e., the propagation of data/queries throughout the network,
and data gathering, i.e., the collection of observed data from the individual sensor
nodes to a sink. There are two kinds of WSNs according to the method of delivering
the data from the sensor nodes to the sink: layered and clustered.
For data gathering applications, such as battle?eld surveillance, real-time monitor-
ing of seismic waves, machine operations, bush ?res, and etc., both network throughput
and packet latency are critical in order to guarantee accurate and timely delivery of
sensed data. To deal with this issue, wireless CDMA sensor networks (WCSNs) have
been proposed and studied in a large amount of literature. The advantage of code
division multiple access (CDMA) is its ability to accommodate many sensor nodes on
the same frequency at the same time. The number of available CDMA codes is es-
sentially in?nite. This makes CDMA ideally suited to a large number of sensor nodes
which generate a relatively small amount of tra±c at irregular intervals, as it avoids
the overhead of continually allocating and de-allocating a limited number of orthogonal
time slots or frequency channels to individual sensor nodes.
Sink capacity is one of the key questions in WCSNs.
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