The Institute for Telecommunication Sciences (ITS)

WIDEBAND MOBILE DATA: Data Decription

Phoenix, Arizona — Survey Description

Wideband mobile data were collected at a carrier frequency of 915 MHz. These data were meant to characterize wideband radiowave propagation from a variety of cellular base stations. To do this the transmiited signal was modulated with a pseudo noise code at a chip rate of 10 MC/s and a receiver was mounted in a van with GPS and dead reckoning navigation. Cells were surveyed in suburban and urban areas of Phoenix, AZ. Drive speeds were typically between 25-45 MPH.

The data files consist of complex impulse response measurements for the radio channel. In addition to the impulse response data, files contain header information that gives all parameters associated with these data. For instance, data is collected in segments which then comprise a burst of data. Each segment is a complex impulse response. The holdoff, or time between data segments, is usually between 5-7 ms and can be read from the header contained in the data files. Another parameter is the number of segments or impulse responses per burst of data. This parameter (Segs) is between 64 and 128 and can also be determined from the data headers. The time of each burst of data and its latitude and longitude can be determined from the GPS string also in data headers. A more detailed description of the data file format is contained in the file format.pdf which must be viewed with Acrobat's Reader and is shipped with the data files.

A list of these sites with locales is given in Table 1. A list of the sites with transmitter parameters is given in Table 2.

Table 1. Locale of Data Sets
Data Set	Locale*
Chandler	Rural
Sky Harbor	Urban/Suburban
Washington	Urban High Rise
Indian School	Urban/Suburban
Research	Urban/Suburban
*See reference [3] for a definition of these locales.

Table 2. Phoenix, Arizona - Data Sets and Transmitter Specifications
Data Set	Lat	Long	AMSL (ft)	Tower Height (ft)	Ant. Tip* (ft)	Azimuth (deg)	Ant. Gain (dB)	Ant. Model	Tilt (deg)	EIRP (dBm)
CHANDLER (AI)	33-16-34	111-52-44	1188	100	110	23	11	ALP-9211	6	50
CHANDLER (BI)					110	143	11	ALP-9211	0	50
CHANDLER(GI)					110	263	11	ALP-9211	0	50
SKY HARBOR(A)	33-24-58	111-58-26	1136	80	81	23	5	ALP-9205	0	50
SKY HARBOR(B)					88	143	14	ALP-7905n8	0	50
SKY HARBOR(G)					84	263	11	ALP 9211	10	50
WASHINGTON(A)	33-26-45	112-04-50	1081		52	23	11.8	DB874H105	0	50
WASHINGTON(B)					52	143	11.8	DB874H105	0	50
WASHINGTON(G)				146	52	263	11.8	DB874H105	0	50
INDIAN SCH(AI)	33-29-13	112-04-41	1103		60	23	11	ALP 9211	5	50
INDIAN SCH(BI)					60	143	11	ALP 9211	5	50
INDIAN SCH(GI)					60	263	11	ALP 9211	0	50
RESEARCH(AO)	33-20-54	111-53-39	1188		54	23	12	ALP 9212	0	50
RESEARCH(BO)					58	143	14	ALP 9214	0	50
RESEARCH(GO)					44	263	12	ALP 9212	0	50
*Antenna Tip = top of antenna

Table 3 gives a list of CD's available for purchase. Each CD costs $400 and can be obtained by completing an application form and Data CRADA (cooperative research and development agreement) using the ITS web site.

Table 3. Order # and Pricing Information for Phoenix, AZ Data Sets
Order #	Data Set	Cost
01-1	P. B. Papazian, J. R. Hoffman, Y. Lo, "Phoenix, AZ, Chandler, Sectors A, B, G," NTIA/ITS Mobile Radio Impulse Response Data 01-1 [CD-ROM], 2000.	$400
01-2	P. B. Papazian, J. R. Hoffman, Y. Lo, "Phoenix, AZ, Sky Harbor, Sectors A, B, G," NTIA/ITS Mobile Radio Impulse Response Data 01-2 [CD-ROM], 2000.	$400
01-3	P. B. Papazian, J. R. Hoffman, Y. Lo, "Phoenix, AZ, Washington, Sectors A, B, G," NTIA/ITS Mobile Radio Impulse Response Data 01-3 [CD-ROM], 2000.	$400
01-4	P. B. Papazian, J. R. Hoffman, Y. Lo, "Phoenix, AZ, Indian School, Sectors A, B, G," NTIA/ITS Mobile Radio Impulse Response Data 01-4 [CD-ROM], 2000.	$400
01-5	P. B. Papazian, J. R. Hoffman, Y. Lo, "Phoenix, AZ, Research, Sectors A, B, G," NTIA/ITS Mobile Radio Impulse Response Data 01-5 [CD-ROM], 2000.	$400

Background information can be obtained from the following references.

REFERENCES

[1] J. Wepman, "Digital Sampling Probe," NASA Tech Briefs. May 1995 http://www.its.bldrdoc.gov/pub/chprobe/

[2] J. Wepman, R. Hoffman, L. Loew, "Impulse Response Measurements in the 1850-1990 MHz Band in Large Outdoor Cells," NTIA Report 94-309, June 1994.

[3] J. Wepman, J. Hoffman, L. Loew, V. Lawrence, "Comparison of Wideband Propagation in the 902-928 and the 1990 MHz Bands in Various Macrocellular Environments," NTIA Report 93-299, Sep. 1993.

[4] P. Wilson, P. Papazian, M. Cotton, Y. Lo, "Advanced Antenna Test Bed Characterization For Wideband Wireless Communications," NTIA Report 99-369, Aug. 1999.

[5] P. Wilson, P. Papazian, M. Cotton, C. Holloway and Y. Lo, "The Institute for Telecommunication Sciences Channel Sounding Program," 3G Wireless Conference, San Francisco, CA., June 13-16, 2000.

[6] Peter Papazian, Perry Wilson, Michael Cotton and Yeh Lo, "Flexible Interoperable Transceiver (FIT) Program Test Range I: Radio Propagation Measurements at 440, 1360 and 1920 MHz Edwards Air Force Base, NTIA Report 00-380, Sep. 2000.

For more information concerning the Wideband Mobile Data contact:
Peter Papazian, Electronics Engineer
Institute for Telecommunication Sciences
Voice: (303) 497-5369, FAX: (303) 497-3680
E-mail: ppapazian@its.bldrdoc.gov

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