Digital Communication
Digital Communication Report
Author: Nan Wang Date: 15/05/2013
Contents:
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1. Introduction
Currently, the increasing interest in convenient communication has heightened the need for digital communication development. This report would introduce an ambulance service system. As an emergency system, it should be quick response; in addition, the quality of the signal transmission is also very important. Then it is necessary to choose the appropriate components.
Graph 1 [1]
1. Digital source
Generally speaking, the graph shows above is a general block diagram of a digital communication system. Furthermore, this system should be in the environment of Ultra High Frequency which frequency should between 300-3000 MHZ. To be more specific, the digital source in this model includes 3 types of data: the first one is the digitized ‘telephone quality’ voice which is a voice signal, the other two are the imagine signal, one is from the patient monitor and the other one is from the digital camera. In addition, the monitoring system would produce some binary data like blood pressure data. Then the system should be specific like this:
1.1 Parameter Calculation
Through the task requirement, the speed of ambulance v=120km/h=33.3m/s, frequency f=2 GHZ, bandwidth B=10 KHZ, Signal Noise Ratio SNR=50dB. Then we could calculate Doppler shift:
=222.2 HZ. This Doppler shift would have some relationship with the interleaver length which would be used in channel coding, and the monitoring system would produces data at a fixed rate of 100 bps. In this condition, based on the Simulink of interleaving we could estimate when interleaver at about 150*150, the
Author: Nan Wang Date: 15/05/2013
Contents:
`
1. Introduction
Currently, the increasing interest in convenient communication has heightened the need for digital communication development. This report would introduce an ambulance service system. As an emergency system, it should be quick response; in addition, the quality of the signal transmission is also very important. Then it is necessary to choose the appropriate components.
Graph 1 [1]
1. Digital source
Generally speaking, the graph shows above is a general block diagram of a digital communication system. Furthermore, this system should be in the environment of Ultra High Frequency which frequency should between 300-3000 MHZ. To be more specific, the digital source in this model includes 3 types of data: the first one is the digitized ‘telephone quality’ voice which is a voice signal, the other two are the imagine signal, one is from the patient monitor and the other one is from the digital camera. In addition, the monitoring system would produce some binary data like blood pressure data. Then the system should be specific like this:
1.1 Parameter Calculation
Through the task requirement, the speed of ambulance v=120km/h=33.3m/s, frequency f=2 GHZ, bandwidth B=10 KHZ, Signal Noise Ratio SNR=50dB. Then we could calculate Doppler shift:
=222.2 HZ. This Doppler shift would have some relationship with the interleaver length which would be used in channel coding, and the monitoring system would produces data at a fixed rate of 100 bps. In this condition, based on the Simulink of interleaving we could estimate when interleaver at about 150*150, the