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Transmitted and Received Power in Communication Systems Key Concepts Transmitted Power ( P s ): The average power of the transmitted signal is defined as the power that is radiated from the transmitter. For a BPSK signal, where the transmitted symbols are either +1 or -1 , the average transmitted power is: P s = 1 Since the magnitude of both +1 and -1 is 1 , the average power of the transmitted BPSK signal is 1 . Channel Coefficient ( h ): The channel coefficient h characterizes how the transmitted signal is affected as it propagates through the channel. It can be represented as a complex number: h = a + jb The magnitude squared of the channel coefficient |h|² gives us the channel gain, which describes how much the signal power is amplified or attenuated as it passes through the channel: |h|