Low Noise Amplifier Design and Analysis for Wireless Voice Transmission

LNA (Low-Noise Amplifier) is an integral part of wireless communication system. Generally weak modulated wireless signal such as one used for indoor wireless voice communication are affected by surrounding noise and signal at the receiver is quite weak. As such amplification of such signal at the digital level is near impossible in this work we design and analyze the performance of LNA based wireless voice transmission system. We first design a wireless voice transmission through commercial mic. The receiver is attached to the PC audio port. We add the LNA component through a transistor switch to the receiver with the help of Arduino. In PC software we analyze the signal received in the presence of LNA and in the absence of it. We prove that LNA can lift the signal significantly, thereby providing a better voice level. We also analyze the voice quality of the signal by playing an audio file in PC which is transmitted back to the PC through our wireless mic. We show that MSE of the signal is reduced significantly by LNA. Therefore our works not only propose a suitable design for low noise amplifier but at the same time offers a realistic simulation bed to study the performances of the amplifier.