Performance Analysis of Uplink & Downlink Transmission in CDMA System

TL;DR

This paper analyzes the performance of uplink and downlink transmissions in CDMA systems by simulating SNR probability density functions, considering channel impairments like noise and interference.

Contribution

It provides a comparative simulation of SNR distributions for uplink and downlink in CDMA, highlighting differences and channel effects.

Findings

Uplink and downlink have distinct SNR characteristics.

Channel impairments significantly affect system performance.

Simulations assume an average SNR of 6dB.

Abstract

CDMA is a multiple access method in which the user's uses spread spectrum techniques and occupy the entire spectrum whenever they transmit. In wireless communication signal-to-noise ratio (SNR) is the very important parameter that influences the system performance. Any mode of mobile transmission is not free from channel impairment such as noise, interference and fading. This channel impairment caused signal distortion and degradation in SNR.Also there are differences between uplink (forward channel) and downlink (reverse channel).Along with these differences, both the links use different codes for chanellizing the individual users. This paper simulates the expressions for the pdfs of the SNR for both uplink and downlink transmission assuming that the system is operating at an average signal-to-noise ratio is 6dB per information bit.