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Cellular Transmission 

 March 2, 2021

By  Kadeeja Tamanna

Introduction 

In this blog, we will study signal generation, which occurs during the cellular transmission of 10 different users using MATLAB Coding. The signal modulation scheme used for Cellular transmission is known as Direct Sequence Spread Spectrum with Binary Phase Shift Keying using PN Sequence. We will study how encoding takes place in cellular transmission and how it can help various applications such as call tapping, location detection of a user, encryption, etc. 

Important Keywords 

1. Cell: A cell is a region or an area that consists of a base station used by all the users for wireless mobile-based communication.  

CellularDivisions
2. BPSK: BPSK or Binary Phase Shift Keying is a two-phase modulation scheme used in Cellular Transmission. The block diagram and output waveform of BPSK Modulation is shown in the figure below: 
BPSK Blockdiagram

3. PN Sequence: Pseudo-Noise (PN) sequences are used in DSSS modulation to introduce white noise as well as encrypt the data sequence. 

G= 1+x_{1}^{a}+x_{2}^{b}+\cdots+x_{n}^{z} 

where, G is Generator Polynomial. 

Concept 

In Cellular transmission, the signal generation that occurs is known as Direct Sequence Spread Spectrum (DSSS). The steps to generate a DSSS transmission signal are as follows: 

1. Firstly the analog “message” is converted into binary form in the form of a sequence of bits with value 0 or 1. 

2. Then the message bits are encrypted with the cell code(i.e., the area/location code) 

3. The resultant binary sequence is converted into a square wave and superimposed with a carrier wave to generate a BPSK signal. 

4. The BPSK signal is then superimposed with a PN Sequence to finally generate DSSS Waveform. 

DSSS Transmission

MATLAB Output

Cellular Transmission Signals generated from one user

Signals generated from one user 

Cellular Transmission DSSS Signal (Sampled) of one user

DSSS Signal (Sampled) of one user 

Applications

Study of DSSS Scheme is helpful in various fields such as: 

  • Digital Encryption and Decryption 
  • Cellular Tapping 
  • Location Tracking 
  • Data Alteration  
  • Military and Defiance  

Conclusion 

In this blog, we learned the implementation and signal analysis of DSSS Signals generated during Cellular Transmission using MATLAB Coding. We studied the role of each type of encryption used in each step of modulation and how it can help implement different applications. 

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About the author 

Kadeeja Tamanna

An engineering graduate, who is passionate to employ her knowledge and skills, in developing and providing solutions to technological requirements in the healthcare domain. Proficient in signal processing, data analysis, statistical analysis, computational modeling using MATLAB programming. Currently a MATLAB Developer intern at MATLAB Helper ®.

  • Nikita Mahoviya says:

    Quite a detailed explanation with great visual effects!!

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