Link Energy Minimization in IR-UWB Based Wireless Networks

Abstract

Impulse Radio Ultra WideBand (IR-UWB) communication has proven to be an important technique for supporting high-rate, short-range, and low-power communication. In this paper, using detailed models of typical IR-UWB transmitter and receiver structures, we model the energy consumption per information bit in a single link of an IR-UWB system, considering packet overhead, retransmissions, and a Nakagami-m fading channel. Using this model, we minimize the energy consumption per information bit by finding the optimum packet length and the optimum number of RAKE fingers at the receiver for different transmission distances, using Differential Phase-shift keying (DBPSK), Differential Pulse-position Modulation (DPPM) and On-off Keying (OOK), with coherent and non-coherent detection. Symbol repetition schemes with hard decision (HD) combining and soft decision (SD) combining are also compared in this paper. Our results show that at very short distances, it is optimum to use large packets, OOK with non-coherent detection, and HD combining, while at longer distances, it is optimum to use small packets, DBPSK with coherent detection, and SD combining. The optimum number of RAKE fingers are also found for given transmission schemes.

CLOEE - Cross-Layer Optimization for Energy Efficiency of IEEE 802.15.6 IR-UWB WBANs

“…A noncoherent receiver and hard decision combining is considered, ρ r = 0, and ρ c = 0. For the energy consumption model, we have ε p = 20 pJ, P COR = 10.08 mW, P ADC = 2.2 mW, P LNA = 9.4 mW, P VGA = 22 mW, P SYN = 30.6 mW, P GEN = 2.8 mW, and T ST = 400 µs [16].…”

Energy Efficiency Optimization of Channel Access Probabilities in IEEE 802.15.6 UWB WBANs

“…Among the energy models for IR-UWB radios [4], [6], [10], we employ the one in [10] as it provides a general model which considers different detectors, modulation types and demodulators. We define the energy consumptions for each of the three channel states described in Section II-C. For a successful transmission, the energy consumption is…”

“…where ε Tx B , ε Tx OH , and ε Tx ST are defined similarly as the energy required for payload bit, overhead, and startup in transmission only. When the channel is idle, we assume that no energy is consumed, i.e., ε I k = 0 [10]. The details about the energy consumption model for different detector, modulation, and demodulation types can be found in [7], [10].…”

Energy Efficient Doppler Assisted Channel Estimation for Highly Mobile OFDM Systems

“…On the other hand, circuit energy also plays an important role in the lifetime of the battery operated nodes. Therefore, many authors [9][10][11][12][13][14][15][16] have considered circuit energy while assessing the energy efficiency of different schemes. The solutions discussed above only consider the transmission energy and do not take into account the circuit energy.…”