| Summary: | 碩士 === 朝陽科技大學 === 網路與通訊研究所 === 96 === The conventional TDMA- or FDMA-based access techniques with the full-direction antennas result in that a base station (BS) is allocated a little part of the system bandwidth. Moreover, the full-direction antennas cannot maintain the space-partition property, that the allocated bandwidth of this BS can not be reused in the covered area. The CDMA-based access techniques, using different coding techniques, with the adaptive antenna arrays (AAA) result in a BS can be allocated all of the system bandwidth. Moreover, the AAA has the space-partition property, that the allocated bandwidth of this BS can be reused in the covered area. Therefore, CDMA-based access techniques with the AAAs that can enlarge the system capacity greatly are the promising architectures. However, the architecture will result in a large number of signal overlapped areas, which there are more than one sensors can handle the areas.
Therefore, using efficient strategies to allocate the overlapped areas to the proper sensors is significant. In light of the above discussions, the investigation proposes different strategies to lessen the probability that sensors with high traffic loads must serve high traffic-load overlapped areas. Therefore, the traffic loads among sensors are fair that can reduce the call blocking rates.
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