【作者】 孟元勤；

【导师】 许洪光；

【作者基本信息】 哈尔滨工业大学 ， 通信与信息系统， 2008， 硕士

【摘要】 为了提高第3代移动通信技术在无线接入领域的竞争力,3GPP提出了第3代移动通信的长期演进计划(Long Term Evolution,简称LTE)。LTE旨在提高数据速率,降低系统时延,增大系统容量和覆盖范围,同时降低运营成本。LTE是国际化标准组织3GPP开展的重要项目,因而对LTE技术的研究很有意义,然而接收机算法直接影响链路的性能,特别是LTE上行接收机算法,所以对LTE上行链路物理层接收机算法研究意义重大。本文主要针对LTE上行物理层链路接收机算法进行研究。首先,介绍了LTE的研究背景、研究意义、研究内容及研究目的。其次,介绍了LTE物理层上行链路的基本结构流程及关键技术,基本内容包括CRC校验、码块分割、速率匹配、Turbo编码、调制等。其关键技术主要是SC-FDMA和虚拟MIMO技术。之后,根据LTE上行发射侧关键技术的特点以及编码调制方式,设计接收机算法,这些算法主要包括信道估计(LS信道估计、理想信道估计、LMMSE信道估计、时域相关信道估计),频偏估计以及解虚拟MIMO(ZF、LMMSE、ML)的原理和算法实现。最后,对链路性能进行仿真验证,包括:(1)在相同的仿真条件下,不同信道估计对性能的影响,主要是理想信道估计,ML(最大似然)信道估计和时域相关信道估计;(2)接收分集中,2天线和4天线的性能对比;(3)单发射天线与虚拟MIMO的性能对比;(4)频偏估计对性能的影响。更多还原

【Abstract】 In order to maintain the future competitiveness of the Third Gerneration (3G) in ten-year, the Third Generation Partnership Project (3GPP) organization passed the 3G long term evolution (LTE) scheme, the main purposes that LTE concerned were to increase data rates, reduce latency, improve system capacity and coverage and reduce operator cost. LTE is an important project which is processed by international standard organization. For receiver algorithm has influence on the performance of the link, so the study of LTE Uplink receiver algorithm became very valuable.This article focused on studies of uplink receiver algorithm.First, it listed the background, the significance, the main purpose and content of LTE physical layer uplink receiver algorithm.In the following part, there are the main structure of LTE uplink and some main technologies, including adding CRC, code segment, rate matching, turbo coding, modulation and so on. The pivotal technologies are SC-FDMA and virtual MIMO.Thirdly, according to the characters of transistor, we designed the receiver algorithm, including channel estimation (LS, ideal channel estimation, time-domain correlative channel estimation), frequency offset estimation and demodulation for MIMO.At last, we simulated the performance in different conditions. (1) the influence on link performance in different channel estimation. (2) The influence rasied by 2 and 4 receiver antenna. (3) The performance played by single sending antenna and virtual MIMO. (4) The performance at different frequency offset.更多还原