Analytical design of top power-bandwidth efficient transmitters for sensor nodes of WSN

The paper presents new approach to designing high efficient adaptive transmitting units (TU) for the sensor nodes of wireless sensor nets (WSN). Particularity of the considered TU is lack of digitizing and coding units. The signals formed by the sensors are transmitted to the base station (BS) using pulse-amplitude modulator adaptively adjusted during the samples transmission. The BS computes estimates of the origin signal, as well as the adjusting controls transmitted to TU through the feedback channel. Transition to the analogue transmission in the channel “node-BS” simplifies the construction of TU and enables development of analytical methods permitting to design optimal TU capable to transmit the signals to BS with minimal MSE and bit-rate equal to the capacity of the channel. The signals emitted by optimal TU have the form of realizations of white Gaussian noise that increases information security of data-transmission. The results of research enable transition to the practical design of low energy and low cost optimal TU which ensure “ideal” power-bandwidth trade off, i.e. work at the Shannon boundary.