Adaptive antenna can react to interfering signal automatically , form the beam zero points at interference and keep the signal receptions in right directions 自適應天線能自動地對干擾信號做出反應,將天線波束零點對準干擾方向,同時保持信號方向的接收能力。
And because of multi - modulation , the precondition of signal reception and demodulation is to decide the specific type of modulation . therefore , automatic recognition of modulation signal has become a requirement of software radio receivers 由于多種調(diào)制方式的存在,對于一個傳輸信號進行接收解調(diào)的前提條件是要確定該信號的調(diào)制方式,因此信號調(diào)制方式的自動識別是軟件無線電接收機中必須具備的功能之一。
Indispensable for high quality optical carrier signal reception in a large dynamic range , agc analog optical receivers are widely used in the optical transmission of radio and microwave signals , such as fiber catv , direct broadcast satellite tv , wireless communication and radar 摘要自動增益控制模擬光接收機廣泛應用于光纖有線電視、光纖直播衛(wèi)星電視、無線通訊及雷達等射頻微波信號光傳輸,是實現(xiàn)大動態(tài)范圍光載波信號高質(zhì)量接收必不可少的一項技術(shù)。
Second , the transmission and reception models of basedband cdma system based on complete complementary codes in up - and downlink are discussed and its performance in awgn channel is analyzed and evaluated through simulation . third , a receiver for multipath signal reception is investigated , which consists of two matched filters : one for channel impulse response estimation and the other for data detection 接下來,對基于完全互補碼的基帶cdma系統(tǒng)上行鏈路和下行鏈路發(fā)送與接收模型進行了討論,分析了該系統(tǒng)下行鏈路在awgn信道中的系統(tǒng)性能,并對該系統(tǒng)上行鏈路和下行鏈路在awgn信道中進行了仿真。