FFT Based High Sensitivity Indoor GPS Receiver Technologies Using CDMA Cellular Network

Chan-Woo Park, Sun Choi and Jaeseung Yoon

Abstract:	It is well known that today’s Assisted GPS (AGPS) [1] core engine used with the CDMA mobile baseband modem can meet all the performance requirements for FCC’s (Federal Communications Commission) Enhanced 911 (E911) with massive parallel correlators meets all the performance requirements for E911 as well as the requirements proposed by commercial location based services that include indoor services [4]. The problem, however, is that these AGPS hardwares are often embedded into the host mobile systems where large hardware size and high power consumption are not desirable. This paper addresses novel receiver architecture and related algorithms for AGPS receiver that operates in the CDMA cellular network. The signal acquisition method presented in this paper achieves ultra-high sensitivity and minimal acquisition time with the help of hardware FFT engine and highly efficient detection algorithms that can reduce the signal detection threshold substantially. As a result, high sensitivity can be achieved without the use of massive hardware correlators and large memory space that are common in today’s high performance indoor GPS receiver technologies. Finally, the paper presents real world experimental data as well as various simulation results using the commercial CDMA mobile handset manufactured with the SCOM5110 baseband modem chip. The SCOM5110 is a CDMA-2000 1x Release-A baseband modem that includes hybrid AGPS functions designed by Samsung Electronics.
Published in:	Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004) September 21 - 24, 2004 Long Beach Convention Center Long Beach, CA
Pages:	428 - 435
Cite this article:	Park, Chan-Woo, Choi, Sun, Yoon, Jaeseung, "FFT Based High Sensitivity Indoor GPS Receiver Technologies Using CDMA Cellular Network," Proceedings of the 17th International Technical Meeting of the Satellite Division of The Institute of Navigation (ION GNSS 2004), Long Beach, CA, September 2004, pp. 428-435.
Full Paper:	ION Members/Non-Members: 1 Download Credit Sign In