MIMO空时编码技术在收发不对等天线上的改进与比较

发布时间：2018-05-11 07:50

本文选题：LTE + OFDM　；参考：《南京邮电大学》2017年硕士论文

【摘要】：第三代合作伙伴计划3GPP(The 3rd Generation Partnershi Project)为了与全球微波互联接入技术(WiMAX:Worldwide Interoperability for Microwave Access)竞争,提出并开发了LTE(Long Term Evolution)。LTE并没有被国际电联承认为4G标注,可以将其看作是3G向4G的一个过渡,通常称之为3.9G。LTE两大核心技术为OFDM/OFDMA(Orthogonal Frequency Division Multiple Access)和MIMO(Multiple-Input Multiple-Output),和3G网络结构相比,LTE网络主要由基站(eNode B:Evolved Node B)和接入网关(AGW:Access Gateway)构成,取消了无线网络控制器(RNC:Radio Network Controller)实现了网络结构扁平化,降低了数据中转带来的时延;取消了了电路转化,完成了固网和移动网络的融合,灵活支持多元化网络幅度,网络了网络的全IP、系统容量得到提高,用户的传输速率以及覆盖范围得到增大,运营成本能有效地降低。LTE的设计目的为使用20MHz的带宽,是在20MHz带宽下,数据上行速度达50Mbps(发射天线数目为1)和数据下行达100Mbps(接收天线数目为2)的峰值。和3G相比,LTE以其快速响应和高速传输的优势,能满足高清视频在线播放,文件快速传输等几乎一切用户对无线服务的需求,而达到这一点与其关键技术:正交频分复用技术(OFDM)以及多天线技术(MIMO)密切相关的。本文着重研究了空时编码技术中的D-BLAST编码方式,并将其进行改进,保证在较小的延迟的前提下实现满发射矩阵占用率,并将改进的编码与主流编码技术一齐运用于收发不对等的天线阵列中,分析天线使用策略,从分集增益、复用增益、信噪比-误码率这三个指标去评价其性能表现。结果表明:对D-BLAST的改进在特定情况下利大于弊;增加接收天线获得的性能收益往往比增加发射天线来的大。
[Abstract]:In order to compete with the global microwave interconnection technology WiMax: Worldwide Interoperability for Microwave Access), the third-generation partnership, 3GPP(The 3rd Generation Partnershi Project), has proposed and developed a LTE(Long Term Evolution).LTE that is not recognized by ITU as 4G tagging, and can be seen as a transition from 3G to 4G. Compared with 3G network structure, LTE network is mainly composed of base station eNode B:Evolved Node B) and access gateway AGW: access gateway. The cancellation of wireless network controller RNC: radio Network controller has flat network structure. It reduces the delay caused by data transfer, cancels the circuit conversion, completes the fusion of fixed network and mobile network, supports the range of multiple networks flexibly, and improves the system capacity by the full IPP of the network. The user's transmission rate and coverage are increased, and the operating cost can be effectively reduced. The purpose of the design is to use the bandwidth of 20MHz, which is based on the 20MHz bandwidth. The data uplink speed is 50 Mbpss (the number of transmitting antennas is 1) and the data downlink is 100 Mbpss (the number of receiving antennas is 2). Compared with 3G, LTE has the advantages of fast response and high speed transmission, which can meet the needs of almost all users for wireless services, such as on-line video playback and file fast transmission, etc. To achieve this is closely related to its key technologies: OFDM (orthogonal Frequency Division Multiplexing) and MIMOM (multiple antennas). This paper focuses on the D-BLAST coding method in space-time coding technology, and improves it to ensure the full transmission matrix occupancy rate under the condition of small delay. The improved coding and the mainstream coding techniques are applied to the antenna array with unequal transceiver and receiver, and the performance of the antenna is evaluated from the diversity gain, multiplexing gain, SNR and bit error rate (SNR). The results show that the improvement of D-BLAST is more beneficial than the disadvantage under certain circumstances, and the performance benefit of increasing the receiving antenna is often greater than that of increasing the transmitting antenna.
【学位授予单位】：南京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN919.3

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