In a wireless communication system, the link margin (LKM), measured in dB, is the difference between the minimum expected power received at the receiver's end, and the receiver's sensitivity (i.e., the received power at which the receiver will stop working). A 15 dB link margin means that the system could tolerate an additional 15 dB of attenuation between the transmitter and the receiver, and it would still just barely work. A system with a negative link margin would mean the system is insufficient to transfer data, usually this means a better receiver is needed, with improved sensitivity.
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