Wireless Sensor Node: ultra-low power energy consumption?
In communications, Link budget analysis is used for evaluating the performance of any wireless data link.Basically the first step in link budget analysis is determining the required signal strength at the receiver in terms of Eb/No in dB, for which a specified level of reliability in terms of BER is achieved.Once the receiver's sensitivity is computed, then its necessary to compute the transmit power required for the modem to operate reliably. This is just a brief, in detail lot of other factors must be considered such as the channel capacity, receiver noise floor, propagation loss etc, the transmit power can be as low of -24 dBm and the receivers sensitivity can be -100 dBm depending on the required SNR. The Link below gives a good insight on how to perform link budget analysis http://www.sss-mag.com/pdf/an9804.pdf