Keseimbangan pautan atas dan pautan bawah dalam sistem WCDMA
In WCDMA system, uplink ( UL ) and downlink (DL) have different channel propagation characteristics. Base station ( BS ) and mobile station ( MS ) require different target bit-energy per noise ratio ( EblNo ), transmitting powers and loading factor. Therefore, the path loss for UL and DL does not ma...
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| 格式: | Thesis |
| 出版: |
2004
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| 主题: | |
| 在线阅读: | http://eprints.uthm.edu.my/1138/ http://eprints.uthm.edu.my/1138/1/24_Pages_from_KESEIMBANGAN_PAUTAN_ATAS_DAN_PAUTAN_BAWAH_DALAM_SISTEM_WCDMA.pdf |
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| 总结: | In WCDMA system, uplink ( UL ) and downlink (DL) have different channel
propagation characteristics. Base station ( BS ) and mobile station ( MS ) require
different target bit-energy per noise ratio ( EblNo ), transmitting powers and loading
factor. Therefore, the path loss for UL and DL does not match and rather unbalanced.
The difference in path loss between UL and DL results in unnecessary interference to
MSs in other cells. If too much transmitting power of MS is used for UL, the soft
capacity degraded. In WCDMA system, CPICH ( Common Pilot Channel ) is the
reference to other common channels from the transmitting power's viewpoint. In this
study, link balance between UL and DL is analyzed. Transmitting power of CPICH is
manipulated for link balance between UL and DL. Then, transmitting power of
CPICH and BS can be estimated. The model used in this study is a WCDMA system
where various service bearers are mixed. In addition, DL loading factor ( YJDL )and link
perf0I111anCe are investigated. Simulations are perf0I111ed using MATLAB Version
6.5.1 software. Simulation results show that transmitting power of CPICH, TCH and
BS increase as the number of MS in the serving cell increases. Transmitting power of
CPICH, TCH and BS decrease as the cells size increase. |
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