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- It uses spread spectrum technology. 它使用扩频技术。
- Wireless Spread Spectrum Communication and Its. 无线扩频通信及其应用。
- Study of Spread Spectrum Receiver. 扩频接收机的研究。
- Then digital matched filter (DMF), which is used to synchronize spread spectrum code, especially the multi-rate sampling in DMF is studied. 然后探讨了用于扩频码同步的数字匹配滤波器(DMF),着重分析了DMF的多倍码速率采样问题;
- The characteristic and quantity of spread spectrum address code has great influence and restriction to CDMA system performance and capability improvement. 在CDMA系统中,扩频地址码的特点和数量在很大程度上影响和制约着CDMA系统性能和容量的提高。
- To despread and demodulate the signal correctly in the spread spectrum system, the PN code phase of the receiver must be synchronized with that of the input signal precisely. 在扩频通信系统中,为正确解扩和解调接收到的扩频信号,接收机的PN序列相位和接收信号的PN序列相位必须完全同步;
- The generating of pseudo random sequence is one of the key subjects to realize the spread spectrum technique upgrade for BPC low frequency time code radio station. 伪随机序列的产生是实现BPC低频时码发播台扩展频谱技术升级的一个重要环节。
- To solve the problem of tracking for direct sequence spread spectrum signals where data is non-coherent with code, a new method of tracking is presented. 摘要针对数据位和伪码周期非相参时直接序列扩频信号的跟踪问题,提出了一种新的跟踪方法。
- The Future of Spread Spectrum Communications in the Datong Coal Mine Group Co. 扩频通信技术在大同煤矿的应用前景。
- Frequency-hopping spread spectrum (FHSS) was developed by the military for secure communications. 跳频扩频(FHSS)是由军方为保密通信开发的。
- Spread spectrum technology competes in the unregulated portion of the radio electromagnetic spectrum. 扩频技术是在无线电电磁频谱中无条例管制的部分中竞争。
- In the acquisition ways of the direct sequence spread spectrum code,sequence probability ratio test(SPRT) acquisition is a better way,acquisition time reduced 2 to 10 times compared with correlation acquisition. 在直扩编码的捕捉方法中;序贯捕捉法是一种较好的捕捉方法;与相关捕捉法相比其速度能提高2~10倍.
- An algorithm based on the Haar wavelet transform(HWT) was developed for blind estimates of pseudo-random code(PC) rates and symbol periods of direct sequence spread spectrum(DS/SS) signals in low signal to noise ratio environments. 为解决低信噪比下直扩信号的参数估计问题,提出了一种基于H aar小波变换实现直扩信号伪码(PC码)速率和符号周期盲估计的新型算法。
- Spread spectrum has two distinct flavors: direct sequence and frequency hopping. 该技术有两个明显的变型:直接顺序与跳频。
- By means of the good period correlation of pseudorandom code and using the synchronism technology, the data transmission ability of the spread spectrum communication system is effectively improved. 提出了一种多幅扩频技术,利用伪随机码良好的周期互相关性,采用同步技术,有效地提高了扩频通信系统数据传输能力。
- The equivalent discrete receiver signal is modeled and denoted in matrix expression form.Also, the relations between taps of receiver equalizer and equivalent spread spectrum code matrix are deduced. 分析了衰落信道下的等效离散接收信号模型,给出其矩阵表达式,进而推导出了接收端均衡器的权系数与等效扩频码矩阵间的关系。
- Pseudo random sequence has broad applications in stream cipher, channel coding, and spread spectrum communication. 伪随机序列在流密码、信道编码、频通信等领域有着广泛的应用.
- A better method for direct sequence spread spectrum(DSSS) receiver to decrease the acquisition time is proposed. 提出一种减小直接序列扩频(DSSS)接收机信号捕获时间的改进方法。
- A small scale digital trunking communication system based on the spread spectrum technology was presented. 介绍了一种基于扩频技术的全双工通信小型集群通信系统。
- Spread spectrum was conducted first, and then it was embedded into watermark by means of integer modulo. 嵌入水印时,先对水印信息进行扩频,再利用基于模运算的方法嵌入水印。