Two Efficient Downlink Transfer Methods for Broadband Satellite Communication Systems with Large Capacity

doi:10.7652/xjtuxb201703017

您当前的位置：

首页 >

文章列表页 >

Two Efficient Downlink Transfer Methods for Broadband Satellite Communication Systems with Large Capacity

更新时间：2025-07-09

- Two Efficient Downlink Transfer Methods for Broadband Satellite Communication Systems with Large Capacity
- Vol. 51, Issue 3, Pages: 98-104(2017)
- 作者机构：
  
  西安电子科技大学综合业务网国家重点实验室,西安,710071
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201703017
  CLC： TN927
- Online First：10 March 2017，
  
  Published：2017
- 稿件说明：
移动端阅览
Two Efficient Downlink Transfer Methods for Broadband Satellite Communication Systems with Large Capacity[J]. 2017, 51(3): 98-104.
DOI：

Two Efficient Downlink Transfer Methods for Broadband Satellite Communication Systems with Large Capacity[J]. 2017, 51(3): 98-104. DOI： 10.7652/xjtuxb201703017.

摘要

针对基于非再生式星上处理的大容量宽带卫星通信系统下行链路采用频分复用(FDM)传输方式效率低、性能差的问题

提出并论证了两种特殊的连续波时分复用(CWTDM)方法——分帧交织叠接相加法(AFO)和准正交时分复用(QOTDM)法。首先

两种方法均先将待传输的各路基带复信号采样量化; 然后

AFO方法对量化信号进行分帧叠接相加后加上帧头构成复用帧进行下行传输

QOTDM方法采用样点交织的时分复接再添加同步序列后转化为连续信号进行传输。AFO方法对信号复接、分接的处理简单; QOTDM方法复接时只需每路缓存一个样点

有利于实现更大容量的星上交换。与FDM下行传输方式相比

这两种方法的功率效率更高、链路特性更好。仿真结果表明

相较FDM传输方式

QOTDM方法的256个载波下的信干比可提高10 dB

子信道隔离度可达到实用要求。

Abstract

Two specific continuous wave time division multiplexing(CWTDM)methods

i.e.

adding frame overlapped(AFO)method and quasi-orthogonal time division multiplexing(QOTDM)method

are proposed to overcome the low efficiency and poor performance of the frequency division multiplexing(FDM)mode in the downlink of broadband satellite communication systems with large capacity based on the non-regenerative on-board processing(OBP). Both the proposed methods firstly samples and quantifies various baseband complex signals to be transferred; Then the AFO method divides the frames and overlaps them with the frame header to consist a multiplexing frame to transfer in the downlink

and the QOTDM method

interleaves sample sequences using the time division multiplexing mode and then transfers the sequences in the way of continuous signals by adding a synchronous sequence. The AFO method is simple in both multiplexing and de-multiplexing

while the QOTDM method is helpful for realizing larger capacity of onboard switching since it only needs to save one complex sample for each signal in multiplexing. Compared with the FDM downlink transfer method

both the proposed methods have higher power efficiency and better link performance. Simulation results show that the ratio of signal to inference of the QOTDM method improves 10 dB in 256 carriers compared with FDM transfer method

and the sub-channels isolation level meets a practical requirement.

关键词

Keywords

references

IIDA T. Satellite broadband system: its needs and technology [C]∥Proceedings of 10th International Workshop on Signal Processing for Space Communications. Piscataway, NJ, USA: IEEE, 2008: 1-6.

易克初, 李怡, 孙晨华, 等. 卫星通信的近期发展与前景展望 [J]. 通信学报, 2015, 36(6): 1-16.

YI Kechu, LI Yi, SUN Chenhua, et al. Recent development and its prospect of satellite communications [J]. Journal on Communications, 2015, 36(6): 1-16.

TIAN B, SUN D C, LIU Z J, et al. Non-regenerating processing in next generation satellite communication networks [C]∥Proceedings of IEEE 11th International Conference on Signal Processing. Piscataway, NJ, USA: IEEE, 2012: 1349-1352.

LIPATOV A A, SKORIK E T, FYODOROVA T M. New generation of geostationary mobile communication satellite: Thuraya complex usage [C]∥Proceedings of 11th International Conference on Microwave and Telecommunication Technology. Piscataway, NJ, USA: IEEE, 2001: 247-249.

GUPTA R. Network centric waveform operation over the WGS [C]∥Proceedings of Military Communications Conference. Piscataway, NJ, USA: IEEE, 2011: 1690-1695.

易克初. 带限信号时分复用传输方法: 981128467 [P]. 1998-04-11.

易克初, 王勇, 易鸿锋, 等. 准正交时分复用传输方法与系统: 200510042910.7 [P]. 2011-1-11.

李怡, 田斌, 易克初, 等. 基于多波束GEO卫星的宽带移动通信系统 [J]. 系统工程与电子技术, 2016, 38(2): 400-408.

LI Yi, TIAN Bin, YI Kechu, et al. A broadband mobile communication system based on multi-beam GEO satellite [J]. System Engineering and Electronics, 2016, 38(2): 400-408.

YI K C, GU C Y, WANG C T. Continuous wave time-division-multiplexing and its applications [J]. IEICE Transactions on Communications, 2005, E88-B(11): 4266-4273.

易克初, 孙永军. 数字通信理论与系统 [M]. 北京: 电子工业出版社, 2013: 272-274.

易克初, 田斌, 李怡, 等. 基于多波束GEO卫星的宽带移动通信方法及系统: 201410168 372.5 [P]. 2014-04-25.

易鸿锋, 谷春燕, 易克初, 等. 一种高精确度的符号定时同步方法 [J]. 西安电子科技大学学报, 2005, 32(6): 915-919.

YI Hongfeng, GU Chunyan, YI Kechu, et al. A high precise method for symbol timing synchronization [J]. Journal of Xidian University, 2005, 32(6): 915-919.

LIU Z J, YI K C. Symbol timing synchronization using interpolation-based matched-filters [J]. Wireless Personal Communications, 2009, 50(9): 457-467.

Views

下载量

CSCD

Alert me when the article has been cited

提交

Tools

Publicity Resources

Numerical Simulation of the Energy Conversion Process in Thermoacoustic Engines with Different Stack Materials

Effects of Expansion Angle Crater Film Hole on the Film Cooling Characteristics of a Double-Wall Structure

A Structure-Semantics-Residual Collaborative Image Compression Framework：Towards Privacy Protection and High-Fidelity Reconstruction

Mechanism and Optimal Control Strategy for Hysteresis in Rapid Dehumidification Response of Indirect Thermal Systems in Electric Vehicles

Effects of Steam Addition on the Swirl Combustion and Emission Characteristics of Cracked Ammonia

Related Author

No data

Related Institution

No data

⁰