Design of Low Power Wake-up Receiver for Wireless Sensor Network

An overview on low energy wake-up radio technology: Active and passive circuits associated with MAC and routing protocols

“…In-Band [50] Active Unicast Out-of-Band [51][52][53][54][55] In-Band [56][57][58][59][60][61][62][63] Indifferent [64][65][66][67] Broadcast In-Band [68] Indifferent [42,[69][70][71] Nevertheless, this is highly expensive in total consumed system power due to all the waking up neighbouring nodes [31].…”

Ultra-Low-Power IoT Communications: A novel address decoding approach for wake-up receivers

“…The architecture of an n-bit address decoder has been depicted in Fig. 3 for a conventional WuR [56,59,60]. In this architecture, the address decoding unit stores the latest received n bits in a shift register, consisting 8 FFs, and passes the input sequence and the stored address through a treeshaped structure of XNOR and AND gates for comparison.…”

“…As one observes here, from top to bottom, the clock signal, the saved address in the device (10011101), the received sequence of data, 8 values of Q 0 to Q 7 , related to the output of respective flip flops, 8 values of X 0 to X 7 , related to the output of XNOR gates, and finally the wake-up signal have been depicted. The above-described address decoding method, empowered by XNORs, has been vastly utilized in different WuR designs [56,59,60]. In order to save further energy for WuRs, it is of crucial importance to decrease the number of active components in the circuitry.…”

Multiple Word Length based low power digital base band receiver

“…The work published at [4] presents a low IF based design for given signal and interference conditions. The work given at [5] discusses wake up scheme for receiver in wireless sensor network applications. However it is to be noted that, in most of the applications the required performance is well known in advance and embedding SNR estimation logic at runtime results in additional power consumption.…”

“…w(n + 1) = w(n) + μ (∇ W J) (4) = w(n) + μe(n)x*(n) As the e and x are complex, the equation will have real and imaginary components. Elaborating the (4) with real and imaginary parts results in (5). The error at each step is computed as given in (6).…”