A low complexity DSP driven analog impairment mitigation scheme for low-IF GNSS receivers

Part of book or chapter of book English OPEN
Ucar, Alper ; Cetin, Ediz ; Kale, Izzet

Due to the increasing demands for location based services within the wireless mass-market; there has been relentless pressure to reduce both the chip area and power dissipation of the user terminal. Low-IF receivers combine the advantages of superheterodyne and direct-conversion architectures offering a highly integrated solution while avoiding the issues associated with DC offsets and flicker noise. The main drawback of the low-IF architecture is its limited image rejection due to analog impairments. In this paper, the sources of the impairments are analyzed for a low-IF receiver operating at the GPS/Galileo L1 band together with a novel low-complexity solution to compensate for them in the DSP domain is proposed. For processing the combined GPS/Galileo L1 signal, a signal simulator we call GNSScope has been developed together with a low-IF receiver model to analyze the influence of the analog impairments. The idea behind our proposed novel adaptive compensator which estimates and compensates for the imbalances and mismatches is that in the absence of these mismatches no correlation exists between the desired and the image channels, which is not the case when impairments are present. Results show that through the deployment of the proposed approach, image-rejection performance can be enhanced by 75 dB. This enhancement in the image-rejection performance subsequently results in relaxed analog front-end specifications leading to high levels of integration making it possible for highly integrated software-defined Global Navigation Satellite Systems (GNSS) receiver to be realistically and economically designed and implemented.
  • References (8)

    [1] Abidi, A. A., "The Path to the Software-Defined Radio Receiver," Solid-State Circuits, IEEE Journal of , vol.42, no.5, pp.954-966, May 2007

    [2] Ingels, M.; Soens, C.; Craninckx, J.; Giannini, V.; Kim, T.; Debaillie, B.; Libois, M.; Goffioul, M.; Van Driessche, J., "A CMOS 100 MHz to 6 GHz software defined radio analog front-end with integrated pre-power amplifier," 33rd European Solid State Circuits Conference, 2007. ESSCIRC , vol., no., pp.436-439, 11-13 Sept. 2007

    [3] Bagheri, R.; Mirzaei, A.; Chehrazi, S.; Heidari, M. E.; Lee, M.; Mikhemar, M.; Tang, W.; Abidi, A. A., "An 800-MHz-6-GHz Software-Defined Wireless Receiver in 90-nm CMOS," Solid-State Circuits, IEEE Journal of , vol.41, no.12, pp.2860-2876, Dec. 2006

    [4] J. Crols, M. S. J. Steyaert, “Low-IF topologies for highperformance analog front ends of fully integrated receivers,” IEEE Transactions on Circuits and Systems II, vol.45, no.3, pp.269-282, Mar 1998.

    [5] Behbahani, F.; Firouzkouhi, H.; Chokkalingam, R.; Delshadpour, S.; Kheirkhahi, A.; Nariman, M.; Conta, M.; Bhatia, S., "A fully integrated low-IF CMOS GPS radio with on-chip analog image rejection," Solid-State Circuits, IEEE Journal of , vol.37, no.12, pp. 1721-1727, Dec 2002

    [6] Jinho Ko; Jongmoon Kim; Sanghyun Cho; Kwyro Lee, "A 19-mW 2.6-mm/sup 2/ L1/L2 dual-band CMOS GPS receiver," Solid-State Circuits, IEEE Journal of , vol.40, no.7, pp. 1414-1425, July 2005

    [7] Kai Borre, "The Galileo Signals With Emphasis on L1 OS," Power Electronics and Motion Control Conference, 2006. EPE-PEMC 2006. 12th International , vol., no., pp.2025-2030, Aug. 2006

    [8] European Space Agency, "Galileo Open Service Signal In Space Interference Control Document (OS SIS ICD)", May 23, 2006.

  • Metrics
    views in OpenAIRE
    views in local repository
    downloads in local repository

    The information is available from the following content providers:

    From Number Of Views Number Of Downloads
    WestminsterResearch - IRUS-UK 0 11
Share - Bookmark