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Forward Link Performance Analysis in CDMA Distributed Antenna Systems with Imperfect Channel Estimation

The Journal of China Universities of Posts and Telecommunications 2005年第1期12卷 64-69页

作者： CHENPeng WUWei-ling InformationEngineeringSchool BeijingUniversityofPostsandTelecommunicationsBeijing100876P.R.China

The impact of imperfect channel estimation on the forward-link performance inCDMA distributed antenna systems in multi-path fading environment is investigated. A detailedanalytical model based on a hybrid signal combining method is presented and exact outage probabilityexpression is derived. The investigation shows that the effect of imperfect channel estimatesvaries with system load. Furthermore, if simulcasting is employed, macro-diversity can decrease thesensitivity of forward-link to channel estimation errors and increase the forward-link outageperformance, which is contrary to the conclusion drawn based on the ideal channel estimationassumption.

关键词： CDMA distributed antenna systems imperfect channel estimation outageprobability

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Relay selection region and system performance analysis for interfered cooperative ad-hoc networks

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Journal of Southeast University(English Edition) 2012年第1期28卷 8-13页

作者：徐艳丽夏玮玮沈连丰东南大学移动通信国家重点实验室南京210096

The performance of interfered cooperative ad-hoc networks is analyzed by stochastic geometry analysis and a selection region of relay is presented. First, assuming that the distribution of nodes in the random network follows the Poisson point process （PPP）, a closed-form expression of the outage probability is derived for the best relay selection （BRS） scheme. Secondly, the capacity of the network is presented for this scheme. Finally, a performance factor is defined to evaluate the performance gain obtained from the BRS. By using this factor, a relay selection region is found to guarantee the performance gain from the BRS. The analysis and simulation results show that the performance of the BRS not only depends on the densities of source nodes and relay nodes but also on the factors of networks such as the path loss factor and the decoding threshold. And the BRS has a greater advantage than direct transmission （DT） in hush environments such as the long transmission distances, much interference and the high decoding thresholds.

关键词： cooperation interference relay selection outageprobability transmission capacity stochastic geometry analysis

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