Demodulation is the process of extracting the baseband message from the modulated signals corrupted by noise so that it may be processed and interpreted by the intended receiver. This chapter describes various modulation and demodulation techniques that are used in communication systems.doi:10.1007/978-...
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i.e., algebraically added. If both the carrier and the modulating signal are sine waves, the waveform resulting at the junction of the two resistors will be like that shown in Fig. 4-8(c), where the carrier wave is riding on the modulating signal. This signal is not AM. Modulation is...
http://en.wikipedia.org/wiki/Amplitude_modulation Modulation circuit designs can be broadly divided into low and high level. Low-Level Generation In many recent radio systems, modulated signals are generated via digital signal processing (DSP). With DSP, many forms of AM modulation are feasible ...
Since AM modulation is simple to use, with a carrier, it is possible to modulate a signal and send it to the receiver, and we still use AM. On the other hand, the demodulation of the AM signals is affordable and quite smooth, which will be explained other parts of the report in deta...
MODULATION. 1/21 Chapter 5 – Signal Encoding and Modulation Techniques. COSC 3213 – Computer Networks I Summer 2003 Topics: 1. Line Coding (Digital Data, Digital Signals) 2. Digital Modulation (Digital Data, Analog Signals) Prof. Brian L. Evans Dept. of Electrical and Computer Engineering ...
...7 4.1调幅电路的仿真...7 4.2抑制载波双边带调幅(DSB)波形仿真输出...9 4.3PCB的制作...10 第五章电路的调试与实现...
In summary, we have demonstrated a 120-km, cascaded-EDFA-based, hybrid AM-VSB/256 quadrature amplitude modulation (QAM) video lightwave link that offers AM CNR >49 dB, CSO and CTB <-63 dBc, and a 256-QAM BER <10/sup -9/.关键词: erbium fibre lasers optical fibre networks optical ...
Amplitude Modulation (AM)(振幅调制).pdf,Name Date • • EXPERIMENT 6 Amplitude Modulation (AM) OBJECTIVES 1. Demonstrate an amplitude-modulated carrier in the time domain for different modulation indexes and modulating frequencies. 2. Determine the
The amplitude of phase fluctuation in the oscillator output is proportional to the degree of modulation of the injected AM signal and inversely proportional to the modulation frequency, while it is independent of the injection level. The frequency of phase fluctuation is equal to the modulation ...