Analog Modulation
Amplitude Modulation and Angle Modulation
Abstract— The aim of this document is to improve understanding of amplitude modulation and angle modulation. We have done this by using Lab view. We have shown 4 types of Amplitude Modulation & 2 types of Angle Modulation.
Keywords-amplitude modulation (AM), angle modulation, double side band modulation (DSB), double sideband suppressed carrier modulation (DSB-SC), double sideband full carrier modulation (DSB-FC), single side band modulation(SSB), phase modulation (PM), frequency modulation (FM), m(t)-message signal, A(c)-amplitude of carrier, Am- amplitude of message signal, f(m) or f(c)-frequency, Y(t)-modulated signal, Xc(t)-carrier signal, Wc [Fc=Wc/2pi] frequency of carrier signal, Wm[Fm=Wm/2pi] frequency of message signal, Ka-amplitude sensitivity factor, USB-upper side band, LSB-lower side band, BW-band width, VSB- vestigial sideband modulation
INTRODUCTION
The process of converting information so it can easily be sent through medium is known as Modulation. Basically required for communication purpose (long range medium). Modulation is usually requires a shift of the range of frequencies contained in the information signal of another frequency for suitable range transmission. Modulation can be of different types, we put emphasized on Amplitude Modulation and Angle Modulation.
1. Amplitude modulation
In AM, information signal or message signal varies the amplitude of carrier signal which is of constant amplitude and high frequency .The product of these two signals will be the modulated signal. 1) REPRESTATION: The carrier signal is represented by
Xc(t)=A(t)sinWct ; Wc=2piFc * All terms are defined above.
Message signal is represented by m(t). m (t)= m(t) A(t)sinWct
Modulated signal Y(t) is given as:
2) MODULATION INDEX:
Modulation index also known as modulating factor is ratio of amplitude of message signal to carrier. It should be a number between 0-1 thus
Abstract— The aim of this document is to improve understanding of amplitude modulation and angle modulation. We have done this by using Lab view. We have shown 4 types of Amplitude Modulation & 2 types of Angle Modulation.
Keywords-amplitude modulation (AM), angle modulation, double side band modulation (DSB), double sideband suppressed carrier modulation (DSB-SC), double sideband full carrier modulation (DSB-FC), single side band modulation(SSB), phase modulation (PM), frequency modulation (FM), m(t)-message signal, A(c)-amplitude of carrier, Am- amplitude of message signal, f(m) or f(c)-frequency, Y(t)-modulated signal, Xc(t)-carrier signal, Wc [Fc=Wc/2pi] frequency of carrier signal, Wm[Fm=Wm/2pi] frequency of message signal, Ka-amplitude sensitivity factor, USB-upper side band, LSB-lower side band, BW-band width, VSB- vestigial sideband modulation
INTRODUCTION
The process of converting information so it can easily be sent through medium is known as Modulation. Basically required for communication purpose (long range medium). Modulation is usually requires a shift of the range of frequencies contained in the information signal of another frequency for suitable range transmission. Modulation can be of different types, we put emphasized on Amplitude Modulation and Angle Modulation.
1. Amplitude modulation
In AM, information signal or message signal varies the amplitude of carrier signal which is of constant amplitude and high frequency .The product of these two signals will be the modulated signal. 1) REPRESTATION: The carrier signal is represented by
Xc(t)=A(t)sinWct ; Wc=2piFc * All terms are defined above.
Message signal is represented by m(t). m (t)= m(t) A(t)sinWct
Modulated signal Y(t) is given as:
2) MODULATION INDEX:
Modulation index also known as modulating factor is ratio of amplitude of message signal to carrier. It should be a number between 0-1 thus
References: * www.mathworks.com. * www.cnx.org * Books: simon haykin