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MICROCELLULAR MOBILE RADIO CHANNEL TRANSMISSION LOSS and TEMPORAL DISPERSION CHARACTERISTICS AT 1.9 GHz AND 5.8 GHz
| Content Provider | Semantic Scholar |
|---|---|
| Author | Schenk, Tim C. W. |
| Copyright Year | 2003 |
| Abstract | There is considerable interest in determining differences between radio channel characteristics in the currently allocated mobile radio frequency bands and bands that might be allocated for that purpose in the future. This document is therefore devoted to a determination and comparison of channel characteristics estimated from measurements on microcellular mobile radio channels at frequencies near 1.9 GHz and 5.8 GHz. Channel parameters that are considered include transmission loss, multipath spreads as well as various measures thereof, and frequency correlation characteristics. INTRODUCTION This document summarises two conference papers [1,2] that were written to report the results of propagation measurements, data analysis and modelling. The benefit of duplicating the information here is to make it more readily available to COST273 participants, and provide interpretations that were not possible when the original papers were written. However, not all material from the original papers is duplicated, and some is new. The data that were analysed for this work were recorded during sequential CW and pseudo-noise channel sounding measurements. In both cases, transmission was from a biconical antenna mounted at 6m above ground level on a mast extended from the roof of a 1.8m high closed-in utility trailer that housed the transmitter (Tx) electronics. The trailer was parked near the curb in metered parking spaces on downtown Ottawa streets. Measurements at 1.9 GHz and 5.8 GHz (hereinafter referred to as 2 and 6 GHz for convenience) were made on different days. Though the transmit biconical had a wide enough bandwidth for operation at both frequencies, it was not considered suitable for use above the receive vehicle roof. Reception at each centre frequency was therefore via a tuned quarter-wavelength monopole mounted in the centre of the roof of a minivan. In-situ radiation patterns were measured to be omnidirectional within +/3 dB. The minivan was driven at normal traffic speeds throughout the urban centre. Offair signals at the receiver (Rx) were downconverted to yield in-phase (I) and quadrature-phase (Q) baseband signals that were each sampled at either 10 MSamples/s, or 2 kSamples/s, depending on whether operation was in the wideband (psedo-noise), or CW mode, respectively. In the wideband mode, 511 chip PN sequences were transmitted at a rate of 5 Mchps. It is recognised that the resultant sounding bandwidth is too narrow for either recognition of off-line correlations with a reference sequence as radio channel impulse response estimates for applications that consider the wide bandwidths of cellular systems proposed for the future, or for an investigation of radio propagation physics. However, it is sufficient for an investigation of multipath spreads, defined as the maximum with of such cross-correlation estimates (XCEs), from the earliest relative delay of their emergence above noise, to the latest delay before they subside below noise. They are also considered suitable for use in the estimation of frequency correlation characteristics during fading [3]. Since all transmitter and receiver oscillators in the measurement systems were slaved to |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://tte.ele.tue.nl/radio/publications/ECR%20pubs%202003/TD-03-015.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
