跳至內容

基帶

本頁使用了標題或全文手工轉換
維基百科,自由的百科全書
基帶信號的頻譜,單位頻率的能量 E 作為頻率 f 的函數。總能量是線下的面積。

基帶(英語:baseband)是頻率範圍非常窄的信號,也就是說幅度譜僅在原點(f = 0)附近才是非零的,其他頻率幾乎可以忽略。[1]電信信號處理中,基帶信號是未經載波調製的信號,即該信號的頻率範圍沒有任何移位,[2] 而且頻率很低 - 包含帶從接近 0 Hz到更高截止頻率或最大帶寬。

由於基帶信號是未經載波調製的信號,在GPS接收機和移動電話等無線數字通訊領域,基帶信號有時也泛指已經過射頻前端英語Radio Frontend處理後的信號。[3][4]在無線通訊設備中,來自天線的信號先經射頻前端英語Radio Frontend的模擬電路接收,然後再轉交給後續的數字電路進一步處理,而後者就是基帶處理器[3][4]在當前中文語境中,手機基帶處理器所帶的固件也簡稱「基帶」[5]

參見

參考文獻

  1. ^ Leon W. Couch II. Digital and Analog Communication Systems. Prentice Hall. 1993. 
  2. ^ B.P. Lathi. Modern Digital and Analog Communication Systems. Holt, Rinehart and Winston. 1983. 
  3. ^ 3.0 3.1 Christian Piguet. 6: Low-Power Bandband Processors for Communications. Low-Power Processors and Systems on Chips. CRC Press. [2020-01-10]. (原始內容存檔於2020-04-26). Baseband Signals are all signals in a radio system, which are not modulated onto the carrier wave. In a cellular phone, this means all signals except those in the radio frequency (RF) part of the phone. 
  4. ^ 4.0 4.1 U.S. International Trade Commission. In the Matter of Certain GPS Chips, Associated Software and Systems, and Products Containing Same, Investigation No. 337-TA-596 (報告). DIANE Publishing: 6. A GPS receiver typically includes an analog signal processing portion in a radio-frequency circuit (an "RF Front End") and a digital signal processing portion in a baseband circuit (a "Baseband Processor"). In a GPS receiver, the RF Front End receivers the GPS signal, filters and amplifies the signal, and converts the resulting signal into a digital formbat. The resulting digital signal, which is sometimes referred to as the "baseband signal," is sent to the Baseband Processor. 
  5. ^ 基带是什么. 太平洋IT百科. [2016-02-07]. (原始內容存檔於2016-02-07).