DocumentCode :
1757091
Title :
Concurrent Vital Sign and Position Sensing of Multiple Individuals Using Self-Injection-Locked Tags and Injection-Locked I/Q Receivers With Arctangent Demodulation
Author :
Fu-Kang Wang ; Chia-Hui Fang ; Tzyy-Sheng Horng ; Kang-Chun Peng ; Jian-Yu Li ; Cheng-Chung Chen
Author_Institution :
Dept. of Electr. Eng., Nat. Sun Yat-Sen Univ., Kaohsiung, Taiwan
Volume :
61
Issue :
12
fYear :
2013
fDate :
Dec. 2013
Firstpage :
4689
Lastpage :
4699
Abstract :
This work presents a wireless system that operates in the 2.4 GHz ISM band for concurrently sensing the vital signs and positions of multiple individuals. Characterized by low complexity and high accuracy, the proposed system consists of two main parts. One is a self-injection-locked (SIL) tag carried by a subject, which emits a sinusoidal frequency-modulated (SFM) signal with vital sign information. The other is a group of injection-locked (IL) I/Q receivers, which performs arctangent demodulation of the SFM signal to obtain the position information without using RF reference signals, and simultaneously extracts the vital sign information of the subject. In the experiment, the system is capable of sensing multiple individuals based on frequency division multiple access (FDMA) technique. Moreover, fidgeting effect on the detection of vital signs has been greatly reduced by a spectral product approach. Accordingly, it is demonstrated that the experimental prototype provides accurate information about the vital signs and positions of different individuals in an indoor environment.
Keywords :
demodulation; frequency division multiple access; frequency modulation; indoor environment; radio receivers; FDMA); Multiple Individuals; SFM; arctangent demodulation; concurrent vital sign sensing; fidgeting effect; frequency 2.4 GHz; frequency division multiple access; indoor environment; injection-locked I/Q receivers; position sensing; self-injection-locked tags; sinusoidal frequency modulated signal; spectral product approach; Baseband; Demodulation; Mixers; Radar; Receivers; Sensors; Tuning; Arctangent demodulation; injection-locked (IL) I/Q receiver; self-injection-locked (SIL) tag; vital sign detection; wireless indoor positioning;
fLanguage :
English
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9480
Type :
jour
DOI :
10.1109/TMTT.2013.2288224
Filename :
6662492
Link To Document :
بازگشت