电子学报 ›› 2008, Vol. 36 ›› Issue (7): 1314-1318.

• 论文 • 上一篇    下一篇

实现不等错误保护的最小发射功率AM-OFDM系统

张艳玲, 孙献璞, 李建东   

  1. 西安电子科技大学综合业务网理论和关键技术国家重点实验室,陕西西安 710071
  • 收稿日期:2006-12-12 修回日期:2008-03-11 出版日期:2008-07-25 发布日期:2008-07-25

A Minimum Transmission Power AM-OFDM System to Realize Unequal Error Protection

ZHANG Yan-ling, SUN Xian-pu, LI Jian-dong   

  1. State Key Laboratory of Integrated Service Networks,Xidian University,Xi’an,Shaanxi 710071,China
  • Received:2006-12-12 Revised:2008-03-11 Online:2008-07-25 Published:2008-07-25

摘要: 本文提出了在OFDM系统中实现数据不等错误保护传输的最小发射功率自适应调制算法.利用OFDM系统各个子载波功率增益不相同的特点,将子载波分组,不同的子载波组满足不同的传输质量和传输速率要求,传输不同重要性的数据,并且通过自适应调制调整每个子载波的发射功率和调制阶数,在实现数据不等错误保护传输的同时使得系统消耗的总发射功率最小.仿真结果表明,该算法能够根据输入数据的QoS要求,为不同重要性的数据提供不同的传输质量,并在保证传输质量和速率要求的前提下,使系统的总发射功率最小.

关键词: 正交频分复用, 自适应调制, 不等错误保护, 最小发射功率

Abstract: This paper proposes a minimum transmission power adaptive modulation algorithm to realize unequal error protection for data transmission in OFDM system.The power gains of sub-carriers in OFDM system are different,which is utilized to classify the sub-carriers into groups.Different group provides different transmission rate and transmission quality,thus different group transmits different kind of data.In addition,the modulation order and transmission power of each sub-carrier is adjusted by an adaptive modulation algorithm,so that the unequal error protection for data transmission is realized with minimal total transmission power.The simulation results indicate that the MTP AM-OFDM algorithm presented in this paper can provide different transmission quality for different kinds of data according to the QoS requirements of each data,as well as minimize the total transmission power.

Key words: orthogonal frequency division multiplexing(OFDM), adaptive modulation(AM), unequal error protection(UEP), minimum transmission power(MTP)

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