| Summary: | 碩士 === 國立中央大學 === 通訊工程研究所 === 97 === With increasing usage of wireless communications, the requirement of faster transmission rates
has also increased rapidly. This thesis is concerned with the problem of dynamic resource allocation
and power control. Given the availability of multi-path channels and the transmission rate
requirements of various wireless transmission users, it is necessary to consider a joint channel,
power and rate assignment scheme that satisfies multimedia multi-rate requirements while using
minimal total power.
In this thesis, a dynamic subcarrier allocation algorithm, called the shift subcarrier allocation
algorithm (SSA), is proposed. The SSA algorithm is designed to avoid allocating much power onto
deeply faded bands, reducing transmission power and insuring fairness for each user. To support the
diverse quality of services (QoS) requirements of multimedia traffic, the SSA was designed for
applying onto OFDMA downlink systems. The goals of SSA are QoS satisfaction, throughput
maximization and power sum minimization while satisfying total power or energy constraints.
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