基于循环移位码元的M进制过调制无前导短包通信方案
M-ary overmodulation based on cyclic shift symbols for pilot-free short packet communication scheme
修梦雷 1窦高奇 1王颢1
作者信息
- 1. 海军工程大学电子工程学院,湖北 武汉 430033
- 折叠
摘要
为了解决短包结构中前导训练开销过大导致传输效率低的问题,提出了一种基于循环移位码元的M进制过调制无前导短包通信方案.该方案使用循环移位码元对伪随机序列进行调制,并采用M进制过调制序列对多个码元循环移位进行二次调制.接收端利用伪随机序列良好的自相关与互相关特性,实现无前导训练的检测和同步,有效降低了短包前导训练开销.而过调制的引入在携带额外信息的同时,可有效提高码元同步性能.另外,推导了循环移位和过调制后的短包码元同步评价函数,验证了M进制过调制加载信息的可行性.仿真结果表明,在加性白高斯噪声和瑞利衰落信道下,基于循环移位码元的M进制过调制无前导短包通信方案有效提高了码元同步性能,相比于单个过调制序列,该方案额外传输了lbM bit信息.
Abstract
To solve the problem of low transmission efficiency caused by the high overhead of the pilot in the short packet structure,a M-ary overmodulation based on cyclic shift symbol for pilot-free short packet communication scheme was proposed.The scheme adopted cycle code shift keying(CCSK)to modulate pseudo noise(PN)sequences,and used M-ary overmodulation sequences to perform secondary modulation on multiple CCSK symbols.The receiving end uti-lized the good autocorrelation and cross-correlation characteristics of PN sequences to achieve pilot-free detection and synchronization,which effectively eliminated the training overhead of short packet pilots.The introduction of overmodu-lation effectively improved symbol synchronization performance while carrying additional information.The synchroniza-tion evaluation function of short packet symbols after CCSK and overmodulation was derived,and the feasibility of M-ary overmodulation loading information was verified.Simulation results demonstrate that under AWGN and Rayleigh fading channels,the proposed M-ary overmodulation based on cyclic shift symbols for pilot-free short packet communi-cation scheme for pilot-free short packet communication effectively improves the symbol synchronization performance,and transmits additional lbM bit information compared to a single overmodulation sequence.
关键词
短包传输/无前导/循环移位码元/M进制过调制/码元同步Key words
short packet transmission/pilot-free/CCSK/M-ary overmodulation/symbol synchronization引用本文复制引用
基金项目
国家自然科学基金(61871473)
海军工程大学自主研发计划(2023503090)
出版年
2024
国家科技期刊平台
NSTL
万方数据