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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.
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:
3. PN Sequence: Pseudo-Noise (PN) sequences are used in DSSS modulation to introduce white noise as well as encrypt the data sequence.
where, 
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.
MATLAB Output
Signals generated from 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
Quite a detailed explanation with great visual effects!!