The difference between the thermal noise floor which is a constant that you do not have any control over to what is the receiver sensitivity is controlled by two parameters, one is the noise figure of the receiver that you are using the poorer the noise figure; that means, more noise is being added by your receiver's electronics, so therefore, you have to have higher received signal power.
रिसीवर की संवेदनशीलता को दो मापदंडों द्वारा नियंत्रित किया जाता है, एक है रिसीवर का नोइज फिगर , जो आप उपयोग कर रहे हैं; नोइज फिगर जितना पूअर होगा, आपके रिसीवर के इलेक्ट्रॉनिक्स द्वारा अधिक नोइज जोड़ा जाएगा तो, आपको ज़्यादा रिसीव्ड सिग्नल पावर प्राप्त करना पडेगा।