Limited frequency unannounced access 有限次數(shù)未預告接近
Band limited frequency spectrum 限帶頻譜
The difference , expressed in hertz , between the two limiting frequencies of a band 一個頻帶的上下界頻率之差,單位用赫茲表示。
The difference , expressed in hertz , between the two limiting frequencies of a band 一個頻帶的上下界頻率之差,單位用赫茲表示。
With the fast development of mobile communications and emerging services , the demands for the limited frequency resource are booming 移動通信的飛速發(fā)展和新業(yè)務的不斷出現(xiàn),對有限的頻帶資源的需求越來越大。
They rearranged your dna in order to have you broadcast within a certain limited frequency band whose frequency could feed them and keep them in power 他們重新排列你們的dna為了讓你們在一定的有限頻帶內播放,你們的頻率可以喂養(yǎng)他們,而使他們擁有力量。
In order to increase the efficiency on using limited frequency resource , orthogonal polarization is normally adopted for frequency reuse , thus offering double bandwidth at the certain working band 為了充分利用有限的頻譜資源,衛(wèi)星通信采用正交極化頻率復用方式,在給定的工作頻段上提供雙倍的使用帶寬。
With the rapid development of mobile communication systems , the existing gsm and narrowband cdma cellular system cannot solve the contradiction between the limited frequency source and the increased mobile users 隨著移動通信的飛速發(fā)展,現(xiàn)有的gsm系統(tǒng)和窄帶cdma系統(tǒng)已無法緩解頻率資源有限與移動用戶急速增加的尖銳矛盾。
These are the main contents : the characters in time domain and frequency domain of the background noise inside boiler are analyzed theoretically and studied by experiments , and the upper limit frequency of it is confirmed , these are very important to the diagnosis of boiler tube leak and avoid wrong alarms 對爐內背景噪聲的時、頻域特性進行了理論分析與實驗研究,確定了爐內背景噪聲的上限頻率,這對爐管泄漏的診斷和防止誤報警具有重要意義。
It has been widely applied in personal communications , mobile communications and the field of broad band wireless access , and it has also been regarded as the main air access of the third generation mobile communications , because comparing with tdma and fdma , cdma has greater system capacity , higher frequency efficiency and stronger anti - interference ability , at the same time it still has the potential of solving the conflict of limited frequency resource and limitless user request 相對于tdma , fdma等多址技術而言,它具有系統(tǒng)容量大,頻帶利用率高,抗干擾能力強,保密性能好等優(yōu)越性,同時還具有緩解有限頻帶與無線用戶需求之間矛盾的潛力,因而在個人通信,移動通信,寬帶無限接入領域都得到了廣泛的應用,也被普遍認為是未來第三代移動通信的主流空中接口技術。