Quadrature product subcarrier modulation (QPSM)

1999 IEEE Aerospace Conference. Proceedings (Cat. No.99TH8403) Pub Date : 1999-05-26 DOI:10.1109/AERO.1999.790200

P.A. Dafesh

{"title":"Quadrature product subcarrier modulation (QPSM)","authors":"P.A. Dafesh","doi":"10.1109/AERO.1999.790200","DOIUrl":null,"url":null,"abstract":"Due to the limited availability of spectrum allocations for communications systems, it has become desirable to reuse existing spectrum by employing bandwidth efficient modulation methods to existing satellite communications systems. As the number of users of a given communication system increases, it often becomes necessary to augment the system with additional communication signals. One method that has been used to achieve this goal in Timing, Telemetry and Command (TT&C) links is conventional subcarrier phase modulation. In this work we present a new subcarrier modulation technique called Quadrature Product Subcarrier Modulation (QPSM) that enables the transmission of a quadrature multiplexed carrier modulation with single or multiple subcarrier signals in the same constant-envelope waveform. The general approach is applied to the addition of subcarrier signals to a quadrature multiplexed spread-spectrum system. The overall power efficiency is derived for each case under consideration. The modulation's spectral components are derived analytically and the analytical results are compared to results simulated using the Signal Processing WorkSystem simulation environment.","PeriodicalId":154722,"journal":{"name":"1999 IEEE Aerospace Conference. Proceedings (Cat. No.99TH8403)","volume":"56 1","pages":"0"},"PeriodicalIF":0.0000,"publicationDate":"1999-05-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"2","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"1999 IEEE Aerospace Conference. Proceedings (Cat. No.99TH8403)","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1109/AERO.1999.790200","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"","JCRName":"","Score":null,"Total":0}

引用次数: 2

Abstract

Due to the limited availability of spectrum allocations for communications systems, it has become desirable to reuse existing spectrum by employing bandwidth efficient modulation methods to existing satellite communications systems. As the number of users of a given communication system increases, it often becomes necessary to augment the system with additional communication signals. One method that has been used to achieve this goal in Timing, Telemetry and Command (TT&C) links is conventional subcarrier phase modulation. In this work we present a new subcarrier modulation technique called Quadrature Product Subcarrier Modulation (QPSM) that enables the transmission of a quadrature multiplexed carrier modulation with single or multiple subcarrier signals in the same constant-envelope waveform. The general approach is applied to the addition of subcarrier signals to a quadrature multiplexed spread-spectrum system. The overall power efficiency is derived for each case under consideration. The modulation's spectral components are derived analytically and the analytical results are compared to results simulated using the Signal Processing WorkSystem simulation environment.

查看原文本刊更多论文

正交积子载波调制

由于通信系统频谱分配的可用性有限，通过对现有卫星通信系统采用带宽高效调制方法来重用现有频谱已成为人们所希望的。当给定通信系统的用户数量增加时，通常需要用额外的通信信号来增强系统。在时序、遥测和命令(TT&C)链路中实现这一目标的一种方法是传统的子载波相位调制。在这项工作中，我们提出了一种新的子载波调制技术，称为正交积子载波调制(QPSM)，它可以在相同的恒定包络波形中传输具有单个或多个子载波信号的正交复用载波调制。将一般方法应用于向正交复用扩频系统中添加子载波信号。总体功率效率为考虑的每一种情况导出。对调制的频谱成分进行了解析推导，并将解析结果与Signal Processing WorkSystem仿真环境下的仿真结果进行了比较。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

1999 IEEE Aerospace Conference. Proceedings (Cat. No.99TH8403)

自引率

0.00%

发文量