Có 23+ tài liệu thuộc chủ đề "Lò vi sóng RF"
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The lower frequency is called the modulating signal, the higher frequency signal is called the carrier, and the output signal is called the modulated signal. The benefits of the modulation process are many, such as enabling communication systems to transmit many baseband channels simultaneously at different carrier frequencies without their interfering with each other. Some simple modulation can be achieved...
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Multiple-Access Techniques. 10.1 INTRODUCTION. Three commonly used techniques for accommodating multiple users in wireless communications are frequency division multiple access (FDMA), time division multiple access (TDMA), and code division multiple access (CDMA). Frequency division multiple access and TDMA are old technologies and have been used for quite a while. Code division multiple access is the emerging technology for many new...
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11.1 RADIO NAVIGATION AND GLOBAL POSITIONING SYSTEMS Radio navigation is a method of determining position by measuring the travel time of an electromagnetic (EM) wave as it moves from transmitter to receiver. 11.1 and 11.2.. Figure 11.1 shows an example of an active radio navigation system. Several typical radio navigation systems are shown in Table 11.1 for comparison. FIGURE 11.1...