Variable definitions Chart 12 Variable Definition Units Units dB Energy per bit Watt-seconds dB Noise spectral Watts/hertz dB density Transmitter Watts dBW lower Line loss dB Transmitter db antenna gain pace loss DBVariable Definitions Chart 12 Variable Definition Units Units dB E b Energy per bit Watt-seconds dB N o Noise spectral density Watts/hertz dB P Transmitter power Watts dBW Ll Line loss dB Gt Transmitter antenna gain db L s Space loss DB