Title :
An OFDMA-based wireless body area network using frequency pre-calibration
Author :
Ma, Hsiao-Han ; Yu, Jui-Yuan ; Chen, Tsan-Wen ; Yu, Chien-Ying ; Lee, Chen-Yi
Author_Institution :
Dept. of Electron. Eng., Nat. Chiao-Tung Univ., Hsinchu
Abstract :
A rotator and synthesizer driven (RSD) frequency pre-calibration technique is proposed in this paper for the wireless body area network applications. To overcome the large carrier frequency offset (CFO) and sampling clock offset (SCO) due to a low-cost and low-precision reference clock, the CFO and SCO are estimated from the system downlink process. These estimated CFO and SCO values are provided to a rotator and a synthesizer for signal pre-processing. This RSD concept is evaluated in the proposed WiBoC OFDMA system. The tolerated CFO and SCO ranges are extended to 2.5x of existing wireless systems. This system is designed and simulated in a 90 nm technology with 77.5 muW computation power overhead.
Keywords :
OFDM modulation; calibration; clocks; patient monitoring; radio networks; OFDMA-based wireless body area network; WiBoC OFDMA system; carrier frequency offset; reference clock; rotator driven frequency precalibration; sampling clock offset; synthesizer driven frequency precalibration; Biomedical monitoring; Body sensor networks; Clocks; Downlink; Frequency estimation; Frequency synthesizers; Medical services; Signal sampling; Space technology; Wireless sensor networks; CFO; OFDMA; SCO; WBAN;
Conference_Titel :
VLSI Design, Automation and Test, 2008. VLSI-DAT 2008. IEEE International Symposium on
Conference_Location :
Hsinchu
Print_ISBN :
978-1-4244-1616-5
Electronic_ISBN :
978-1-4244-1617-2
DOI :
10.1109/VDAT.2008.4542445
