chip rate造句
例句與造句
- 3 . chip rate estimation theory of dm method is studied
3.研究了傳統(tǒng)延遲相乘法碼速率估計(jì)原理。 - one watermark pixel is embedded many times ( chip rate ) into different dct coefficients in same block
本文利用多次嵌入技術(shù)，在多個(gè)dct域的多個(gè)系數(shù)中嵌入相同的一位信息。 - the theory research on the detection and estimation chip rate and period of pn sequence in low signal to noise ratios ( snr ) are accomplished in order to put it into realization
本文以工程應(yīng)用為目的,對(duì)低信噪比情況下直擴(kuò)信號(hào)的檢測和pn碼速率和碼周期估計(jì)進(jìn)行了理論研究。 - secondly, the delay and multiply approach is used to detect the ds signals and estimate the chip rate of pn sequence, and then an improved algorithm is proposed . the algorithm is deduced and the theory simulation results are given
然后采用延時(shí)相乘法對(duì)直擴(kuò)信號(hào)進(jìn)行了檢測和pn碼速率估計(jì)研究,提出了改進(jìn)算法,給出了算法推導(dǎo)和理論仿真。 - the square detection can picks up the carrier frequencies, which is simple and has great performance . but this method can ’ t recognize the signal as spread spectrum signal . the spectral correlation detection method can estimates the chip rate of signal ’ s pn sequence
然后,針對(duì)異步的cdma信號(hào),采用延遲相乘的方法檢測用戶數(shù)目,同時(shí)估計(jì)出各用戶信號(hào)的幅值和相位;該方法的缺點(diǎn)是各用戶信號(hào)必須有一定的相差,同時(shí)用戶數(shù)不能太多。 - It's difficult to find chip rate in a sentence. 用chip rate造句挺難的
- with the development of the electron and information technology, the blind de-spread of spread spectrum signals in non-cooperation communication has been a research hot spot . the blind detection and estimation of the chip rate and period of pseudo noise ( pn ) sequence are the precondition for the realization of blind de-spread
隨著電子戰(zhàn)和信息戰(zhàn)技術(shù)的發(fā)展,非合作通信條件下擴(kuò)頻信號(hào)盲解擴(kuò)成為擴(kuò)頻通信領(lǐng)域的研究熱點(diǎn),擴(kuò)頻信號(hào)pn碼速率和碼周期的盲檢測和盲估計(jì)是實(shí)現(xiàn)盲解擴(kuò)的前提。 - the shortcoming of spectral detection is its complexity and in need of long time to compute . a simple and powerful approach is cepstrum detection method, which can estimate pn sequence ’ s time period . using this parameter and the pn chip rate estimated by spectral correlation method, we can get another parameter, length of the pn sequence
另外,本文還嘗試?yán)胏dma信號(hào)的相位重復(fù)特性,解決各用戶pn序列的分離問題;但這種方法只能在有一定先驗(yàn)知識(shí)的條件下,對(duì)包含較少用戶的ds/cdma信號(hào)有較好效果,能夠簡單快速的實(shí)現(xiàn)用戶pn序列的分離與估計(jì)。 - theory simulation results show that the methods mentioned are feasible to detect and estimate the short pn sequence modulation ds signals whose pn sequence length is 63 to 1023 . the delay and multiply approach can be used to estimate the chip rate of long pn sequence modulation ds signals, and the improved algorithm of it is available in lower input snr . the performance of the
延時(shí)相乘法對(duì)長pn碼調(diào)制信號(hào)pn碼速率估計(jì)也適用,其改進(jìn)法的信噪比容限比改進(jìn)前降低;二次功率譜法和倒譜法對(duì)短pn碼調(diào)制有很好的檢測和估計(jì)性能,但對(duì)長pn碼調(diào)制不適用,而基于延時(shí)相乘的二次功率譜法可以很好的估計(jì)出長pn碼調(diào)制信號(hào)的pn碼周期。