Wideband radio channel measurement system at 2 GHz

This paper describes the wideband radio channel sounding techniques for mobile radio channel measurements. Implementation of the cross-correlation method using both a sliding correlator and a matched filter detector is presented. Limitations and accuracy of radio channel measurements are discussed. Typically, delay resolution of about 20 ns is achieved with 100 MHz bandwidth. With a sliding correlator, a dynamic range of 25 dB was obtained with maximum Doppler bandwidth of 25 Hz and maximum excess delay of 19 /spl mu/s. Digital matched filtering with a maximum sampling rate of 125 MHz can be used in real-time measurements with Doppler shifts of several kilohertz and 30 dB dynamic range. Using matched filter deconvolution as a resolution enhancement technique is discussed. Examples of the time-variant complex impulse response measurements are given.

[1]  J. Talvitie,et al.  Self-noise as a factor limiting the dynamic range in impulse response measurements using sliding correlation , 1994, Proceedings of IEEE 3rd International Symposium on Spread Spectrum Techniques and Applications (ISSSTA'94).

[2]  J. D. Parsons,et al.  Sounding techniques for wideband mobile radio channels : a review , 1991 .

[3]  S.-G. Haggman,et al.  Time resolution-signal-to-noise ratio trade-off in deconvolved and Wiener filtered radio channel sounding , 1997, Proceedings of ICUPC 97 - 6th International Conference on Universal Personal Communications.

[4]  F. Seifert,et al.  Measurement of radio channels using an elastic convolver and spread spectrum modulation. I. Implementation , 1994 .

[5]  S. S. Swords,et al.  Digital signal processing techniques applied to mobile radio channel sounding , 1991 .

[6]  S. Seidel,et al.  900-MHz multipath propagation measurements for US digital cellular radiotelephone , 1990 .

[7]  J. D. Parsons,et al.  Wideband characterisation of fading mobile radio channels , 1982 .

[8]  Pertti Vainikainen,et al.  Characterization system for radio channel of adaptive array antennas , 1997, Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97.

[9]  Enric Vilar,et al.  Selective fading on LOS microwave links: classical and spread-spectrum measurement techniques , 1988, IEEE Trans. Commun..

[10]  P. Bello.  Characterization of Randomly Time-Variant Linear Channels , 1963 .

[11]  T. Manabe,et al.  Superresolution of multipath delay profiles measured by PN correlation method , 1992 .

[12]  W. Pietsch,et al.  Measurement of radio channels using an elastic convolver and spread spectrum modulation. II. Results , 1994 .

[13]  Pertti Vainikainen,et al.  Wideband Indoor Radio Channel Measurements at 5.3 GHz , 1997, 1997 27th European Microwave Conference.

[14]  D. Wehner.  High Resolution Radar , 1987 .

[15]  S.-G. Haggman,et al.  Location of subchip radio channel multipath components from direct sequence sounding data , 1997, 1997 IEEE International Conference on Personal Wireless Communications (Cat. No.97TH8338).

[16]  D. W. Allan,et al.  Statistics of atomic frequency standards , 1966 .

[17]  D. Cox.  Delay Doppler characteristics of multipath propagation at 910 MHz in a suburban mobile radio environment , 1972 .

[18]  Pertti Vainikainen,et al.  Phase noise in a direct sequence based channel sounder , 1997, Proceedings of 8th International Symposium on Personal, Indoor and Mobile Radio Communications - PIMRC '97.