基于FPGA的LTE下行链路基带处理系统的设计与实现

发布时间：2018-06-09 16:59

  本文选题：LTE + 物理层　； 参考：《东北大学》2014年硕士论文

【摘要】：LTE(Long Term Evolution)是3G之后无线移动通信的下一代演进技术,可以在各种频谱范围及操作场景中进行部署,可广泛应用于无线通信领域。世界上许多通信运营商已经宣称,将把LTE作为下一代无线通信系统的首选技术。LTE运用了Turbo编码、OFDM调制、MIMO等多种关键技术,使得LTE在编码效率、带宽使用效率、传输速率等方面的优势突出。随着英国的沃达丰、日本NTTDoCoMo、美国ATT和中国移动等世界上最主要的电信运营商对LTE技术的商用,LTE的理论研究意义和商业价值也越来越明显。本设计采用Altera DE2-115开发平台,在FPGA上实现了LTE物理层下行链路基带信号的处理。基带信号的处理可以分为信道编码与信道调制两部分,信’道编码包括CRC24(循环冗余校验)、Turbo编码、速率匹配与信道交织等,信道调制包括加扰、QAM16(正交振幅调制)调制、层映射、预编码、资源映射和OFDM调制等处理。本文着重研究了LTE物理层下行共享信道(PDSCH)的处理过程,最终本基带处理系统可以对1.4Mhz带宽的基带信号进行编码和调制。运用Modelsim软件对系统的功能进行了时序仿真,并且利用Altera公司的Signaltap Ⅱ工具在硬件平台上进行了调试,分析了板级信号,验证了基带信号处理的准确性。经测试证明,本基带处理系统实现了预期功能,具有较好的实时性和准确率,可以作为LTE基带处理的原型系统。
[Abstract]:Long term Evolution (LTE) is the next generation evolution technology of wireless mobile communication after 3G. It can be deployed in various spectrum range and operation scenario, and can be widely used in wireless communication field. Many communication operators in the world have announced that LTE will be the first choice technology in the next generation wireless communication system. LTE makes use of many key technologies, such as Turbo coding, OFDM modulation and MIMO, to make LTE efficient in coding and bandwidth utilization. The advantages of transmission rate are prominent. With the development of Vodafone, NTT DoCoMo, ATT and China Mobile in the world, the theoretical research and commercial value of LTE are becoming more and more obvious. This design adopts Altera DE2-115 development platform, realizes the physical layer downlink baseband signal processing. The processing of baseband signal can be divided into two parts: Channel coding and channel modulation. Signal 'channel coding includes CRC24 (cyclic redundancy check Turbo coding, rate matching and channel interleaving, etc.) channel modulation includes scrambling QAM16 (orthogonal amplitude modulation) modulation, layer mapping, etc. Pre-coding, resource mapping and OFDM modulation processing. This paper focuses on the processing process of LTE physical layer downlink shared channel PDSCH. Finally, this baseband processing system can encode and modulate the baseband signal with 1.4 MHz bandwidth. The function of the system is simulated with Modelsim software, and the signal tap 鈪，

本文编号：2000459