Description: An 8-QAM communications channel simulation in Simulink, constructed from a 16-QAM model and using an I,Q correlation receiver.
QAM (quadrature amplitude modulation) is a method of combining two amplitude-modulated (AM) signals into a single channel, thereby doubling the effective bandwidth. QAM is used with pulse amplitude modulation (PAM) in digital systems, especially in wireless applications. In a QAM signal, there are two carriers, each having the same frequency but differing in phase by 90 degrees (one quarter of a cycle, from which the term quadrature arises). One signal is called the ‘I’ signal, and the other is called the ‘Q’ signal. Mathematically, one of the signals can be represented by a sine wave, and the other by a cosine wave. The two modulated carriers are combined at the source for transmission. At the destination, the carriers are separated, the data is extracted from each, and then the data is combined into the original modulating information. -An 8-QAM communications channel simulation in Simulink, constructed from a 16-QAM model and using an I,Q correlation receiver.
QAM (quadrature amplitude modulation) is a method of combining two amplitude-modulated (AM) signals into a single channel, thereby doubling the effective bandwidth. QAM is used with pulse amplitude modulation (PAM) in digital systems, especially in wireless applications. In a QAM signal, there are two carriers, each having the same frequency but differing in phase by 90 degrees (one quarter of a cycle, from which the term quadrature arises). One signal is called the ‘I’ signal, and the other is called the ‘Q’ signal. Mathematically, one of the signals can be represented by a sine wave, and the other by a cosine wave. The two modulated carriers are combined at the source for transmission. At the destination, the carriers are separated, the data is extracted from each, and then the data is combined into the original modulating information. Platform: |
Size: 11264 |
Author:Griffin Wright |
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Description: 调频电路的matlab simulink 仿真-The objectives of this laboratory are:
To investigate frequency modulation characteristics in the frequency domain.
To implement a classical double-tuned FM demodulator and measure its characteristics.
To implement a modern PLL FM demodulator and measure its characteristics.
To investigate the effect of FM signal bandwidth on the detected signal-to-noise ratio. Platform: |
Size: 158720 |
Author:唐瀚 |
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Description: This Paper is concerned with the study of the performance of DPSK (differential phase shift keying)
Modulation Technique using AWGN(Additive white gaussian noise) channel. The DPSK has remarkable
features such as limited bandwidth and constant envelope, which are of importance for mobile communication
systems for providing the output according to our needs and requirement. In this study we evaluated the Bit
error rate performance of the CDMA system by designing the CDMA system using SIMULINK Tool of the
MATLAB software and study the performance characteristics of DPSK modulated CDMA system which are
helpful for raising the level of present day communication systems, In order to design our DPSK modulated
CDMA system we varied only modulation blocks of simple CDMA transmitter and receiver sections. Platform: |
Size: 705536 |
Author:j |
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Search - bandwidth in matlab simulink