摘要
为研究基于小波跳频码的跳频系统性能,采用小波跳频扩频码和小波快速算法,依据小波变换构造了一组独立均匀分布的扩频随机码,码序列具有多址和自相关特性,结合M allat二进小波算法,产生快跳频的跳频图案,具有抗干扰、抗衰落和抗多径特点.与M序列比较,小波跳频码数目众多,具备快速算法,而且具有正交性、自相关性和平衡性.Monte-Carlo仿真实验表明,采用小波映射跳频码系统误码性能明显优于M伪随机序列2-4 dB,是一种较理想的跳频随机码序列.
Aiming at problem that frequency hopping （FH） code is a key to FH system properties, the paper describes a class of FH stochastic code mapped by wavelet transform in order to perfect the system performance. The wavelet spread spectrum codes have multi-address and autocorrelation characteristics with ent and even distribution. Moreover, combining with wavelet spread frequency to generate fast FH pattern, independ- MaUat wavelet binary fast algorithm, the system utilizes and has ability of anti-interference, anti-fade, and anti- muhipath. In contrast to M sequence, the results show that the bit error rate of wavelet spread code is lower than the M sequence about 2 to 4 dB on the same SNR. The wavelet FH codes have advantage tocorrelation and orthogonality characteristics, The Monte-Carlo simulation indicates that it is in addition to larger number of sequences and ideal FH stochastic code sequences. of balance, aufast algorithm.
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2006年第6期920-924,共5页
Journal of Harbin Institute of Technology
基金
国家自然科学基金资助项目(60372055)
国家高技术研究发展计划资助项目(2003AA123320)
西安交通大学自然科学基金资助项目(xjj2004013)
武器装备预研基金资助项目(2004)
关键词
映射
跳频
同步
跳频序列
小波
MALLAT算法
mapping
frequency hopping
synchronization
FH sequences
wavelet transform
mallat algorithm
