Four-User Spread Spectrum Communication System Using Walsh Codes and BPSK Modulation

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Resource Overview

A four-user spread spectrum communication system with spreading gain N=16, employing Walsh codes for direct sequence spreading, BPSK modulation, and AWGN wireless channel. The receiver performs despreading, demodulation, and decision making. Through MATLAB simulation, we obtain bit error rate versus signal-to-noise ratio results for one user, implementing correlation detection and threshold comparison algorithms.

Detailed Documentation

This paper presents a four-user spread spectrum communication system utilizing Walsh codes for direct sequence spreading with a spreading gain of N=16 and BPSK modulation. The wireless channel is modeled as an AWGN channel. At the receiver end, the system performs despreading, demodulation, and decision making. We conducted simulation experiments to obtain the bit error rate versus signal-to-noise ratio relationship for one specific user. The simulation implementation involves generating orthogonal Walsh codes, applying spreading sequences to user data, and implementing correlation detectors using matched filters. These experiments provide valuable insights into the system's performance characteristics and offer data support for further research in multi-user communication systems.

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