【作者】 钟检荣；

【导师】 张英海； 王卫东；

【作者基本信息】 北京邮电大学 ， 微电子与固体电子学， 2009， 硕士

【摘要】 随着通信系统的不断发展,高速数据业务在未来移动通信系统中占有越来越大的比重,高速数据业务具有上下行传输速率不对称的显著特点。不仅如此,随着数据传输速率的提高,所需的发射功率也相应提高,对人类和环境的影响也越来越大。研究表明:上下行传输率具有明显的非对称特性,上行链路的传输速率是受限的,而下行链路的传输速率远远大于上行链路。移动通信系统是利用双工技术来实现上下行资源分割的,合适的双工技术能适应移动通信的上下行非对称传输需求,从而提高无线资源的利用效率。目前已有的能适应该需求的双工技术有时分双工技术——TDD和自适应动态非对称频分双工技术——AFDD。其中,TDD是一种传统的双工技术,虽然能支持上下行的非对称传输,但容易发生交叉时隙干扰。AFDD是本研究室依托国家自然科学基金提出的一种新型双工技术,该技术没有交叉时隙干扰问题,能够根据用户需要灵活分配上下行频率资源,降低小区间干扰,从而提高频谱利用效率。论文第四章根据AFDD的特点,提出了两种频率分配方案,分别为“基于小区间干扰抑制的AFDD系统频率分配方案”和“基于用户干扰定制的AFDD/CDMA系统频率分配方案”。其中,前者的出发点为最低化小区间干扰,后者的出发点为通过给CDMA系统中的用户分配具有相应干扰水平的频点,来实现用户对传输频点的干扰定制。结果表明,这两种分配方案均能良好地实现其预期效果。更多还原

【Abstract】 With the development of communication system, the high data rate traffic plays more and more important part in future mobile communication system, and the high data rate traffic is characterized by the uplink rate being asymmetric to downlink rate. Furthermore, with increase of transmission rate, the power is also enhanced and the impact on human and environment is growing. By calculation it shows that: under the restriction of electromagnetic radiation, the uplink transmission rate is limited, while the downlink rate is much higher than that of uplink.Duplex technology is used to divide radio resource between uplink and downlink in mobile communication systems, and a proper duplex technology can meet the asymmetric transmission requirement between uplink and downlink, improving utilization efficiency of radio resource. At present, two duplex technologies can meet this requirement, and they are time division duplex -TDD and Asymmetric Frequency Division Duplex - AFDD. TDD is a traditional technology, which could meet the asymmetric transmission requirement but would bring cross time slot interference. AFDD is a novel duplex technology which has no cross time slot interference, and can allocate uplink and downlink resource flexibly according to users’ requirement, mitigating inter-cell interference and improving frequency utilization efficiency.The fourth part of this paper proposed two frequency allocation schemes according to AFDD. They are based on inter-cell interference mitigation and user customization respectively. In the first scheme, the aim is to mitigate inter-cell interference. In the second scheme, the aim is to assign frequencies with the custom-built interference level to users according to their requirement. It’s proved that the two schemes can achieve the expected results.更多还原