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High Bandwidth Efficiency and Low Power Consumption Walsh Code Implementation Methods for Body Channel Communication

High Bandwidth Efficiency and Low Power Consumption Walsh Code Implementation Methods for Body Channel Communication
Ho, Chee KeongCheong, Jia HaoLee, JunghyupKulkarni, VishalLi, PengLiu, XinJe, Min Kyu
DGIST Authors
Ho, Chee Keong; Cheong, Jia Hao; Lee, Junghyup; Kulkarni, Vishal; Li, Peng; Liu, Xin; Je, Min Kyu
Issue Date
IEEE Transactions on Microwave Theory and Techniques, 62(9), 1867-1878
Frequency-selective digital transmission (FSDT)harmonic frequencyhuman body communicationsynchronizationWalsh codewireless
With the growing number of wearable devices and applications, there is an increasing need for a flexible body channel communication (BCC) system that supports both scalable data rate and low power operation. In this paper, a highly flexible frequency-selective digital transmission (FSDT) transmitter that supports both data scalability and low power operation with the aid of two novel implementation methods is presented. In an FSDT system, data rate is limited by the number of Walsh spreading codes available for use in the optimal body channel band of 40-80 MHz. The first method overcomes this limitation by applying multi-level baseband coding scheme to a carrierless FSDT system to enhance the bandwidth efficiency and to support a data rate of 60 Mb/s within a 40-MHz bandwidth. The proposed multi-level coded FSDT system achieves six times higher data rate as compared to other BCC systems. The second novel implementation method lies in the use of harmonic frequencies of a Walsh encoded FSDT system that allows the BCC system to operate in the optimal channel bandwidth between 40-80 MHz with half the clock frequency. Halving the clock frequency results in a power consumption reduction of 32%. The transmitter was fabricated in a 65-nm CMOS process. It occupies a core area of 0.24×, 0.3 mm2. When operating under a 60-Mb/s data-rate mode, the transmitter consumes 1.85 mW and it consumes only 1.26 mW when operating under a 5-Mb/s data-rate mode. © 2014 IEEE.
Institute of Electrical and Electronics Engineers Inc.
Related Researcher
  • Author Lee, Junghyup Integrated Nano-Systems Laboratory
  • Research Interests Analog and Mixed Signal IC Design; Smart Sensor Systems; Bio-medical ICs and Body Channel Communication Systems
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Department of Electrical Engineering and Computer ScienceIntegrated Nano-Systems Laboratory1. Journal Articles
Department of Electrical Engineering and Computer ScienceInformation and Communication Engineering Research Center1. Journal Articles

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