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A body sensor node system-on-chip (SoC) is designed and implemented. The SoC integrates analog front end (AFE), a high-resolution analog-to-digital converter (ADC), an RF-to-DC rectifier, a low dropout (LDO) regulator, and a digital signal processing (DSP) block. The batteryless SoC is powered by RF of 2.45GHz. The rectifier generates 1.8V output and the LDO converts the voltage to stable 1.6V supply...
We consider a downlink cloud radio access network (C-RAN) in which all the base stations (BSs) are connected to a central processor (CP) via digital fronthaul links with finite capacities. The problem of joint base station selection and beamforming design to coordinate interference for power minimization is studied.We formulate the problem of minimizing the network power, which includes the transport...
In this paper, we propose a transmit covariance optimization method to maximize the energy efficiency (EE) for the single-user distributed antenna system, where both the distributed antenna (DA) ports and the user are equipped with multiple antennas. Unlike previous related works, both the rate requirement and DA port selection are taken into consideration. Given this setup, we first propose an optimal...
In this paper, we study the energy efficiency problem of the heterogeneous network composed of pico clusters deployed within the macro cells. We would like to find the optimal transmit power of the pico cells such that the energy efficiency of the cluster is the largest. A cell-specific cell selection bias is also considered so that each user may choose its serving cell in the most energy-efficient...
A low power and full ASIC MPEG-2/4 AAC single chip decoder is presented. The decoding blocks are partitioned into four dedicated hardware modules with the complexity and operational type analysis. Through algorithm, architecture, RTL and circuit level lower power techniques, the proposed AAC decoder is operated at 1.4 MHz for the 44.1 KHz sampling frequency and consumes only 0.21 mW using TSMC 0.13...
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