光学学报, 2013, 33 (7): 0706018, 网络出版: 2013-06-25   

预编码峰均比抑制算法在60 GHz正交频分复用光载无线通信系统中的应用

Application of Peak-to-Average Power Ratio Reduction Algorithm Using Precoding Technique in 60 GHz Orthogonal Frequency-Division Multiplexing Radio-over-Fiber System
作者单位
复旦大学泛媒通信实验室, 上海 200433
摘要
为了有效抑制正交频分复用(OFDM)系统中信号的峰均比(PAPR),提出了一种基于平方根Better-Than奈奎斯特脉冲的改进预编码方案,通过仿真在60 GHz光载无线通信(RoF)系统中实现5 Gb/s四阶正交振幅调制(4QAM)OFDM预编码信号的发射、传输与接收。仿真结果显示,与基于平方根升余弦脉冲的预编码算法相比,改进算法将进一步获得0.3 dB左右的PAPR抑制增益。从平衡传输效率与PAPR抑制性能的角度考虑,由预编码引入的冗余度上限取20%为宜。采用改进的预编码算法,信号的峰均比最大值具有不随OFDM系统子载波数增加而明显增加的特性。无论是在背对背或传输情况下,系统的接收灵敏度均随改进型预编码算法的引入获得约0.4 dBm的改善。如需进一步改进系统误码率特性,可考虑采用高阶调制格式。综合考虑,改进型预编码方案将有效改善传统OFDM-RoF系统的性能并适用于未来的实际应用。
Abstract
In order to effectively reduce the peak-to-average power ratio (PAPR) of orthogonal frequency-division multiplexing (OFDM) signals, an improved precoding algorithm based on square root Better-Than Nyquist pulse is proposed. A 60 GHz radio-over-fiber (RoF) system with precoded 5 Gb/s 4-order quadrature amplitude modulation (4QAM) OFDM downstream signals is demonstrated by simulation so as to evaluate the effectiveness of the proposed algorithm. The simulation results show that, compared with existing precoding method, the improved algorithm further improves the PAPR reduction performance by 0.3 dB. However, considering the balance between bandwidth sacrificed and PAPR reduction performance, the data redundancy no more than 20% is recommended. Meanwhile, the obtained maximum PAPR of the signals is independent of the number of subcarriers. Moreover, for both back to back and transmission cases, the receiver sensitivity can also be improved by 0.4 dBm by using the proposed precoding algorithm. Better bit error rate (BER) performance can be achieved by high-level modulation. Hence, it is suitable for future 60 GHz OFDM-RoF system applications.

王燕瑾, 邵宇丰, 迟楠. 预编码峰均比抑制算法在60 GHz正交频分复用光载无线通信系统中的应用[J]. 光学学报, 2013, 33(7): 0706018. Wang Yanjin, Shao Yufeng, Chi Nan. Application of Peak-to-Average Power Ratio Reduction Algorithm Using Precoding Technique in 60 GHz Orthogonal Frequency-Division Multiplexing Radio-over-Fiber System[J]. Acta Optica Sinica, 2013, 33(7): 0706018.

本文已被 6 篇论文引用
被引统计数据来源于中国光学期刊网
引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!