WINNER II pdf - Final Report - Cept

WINNER II D1.1.2 V1.2
This means that the sounder uses only one physical transmitter and receiver channel, which reduces
sensitivity to channel imbalance. The switched-antenna approach offers a simple way of changing the
effective number of antenna elements in the array. Additionally, since antennas are not transmitting at the
same time, separation of transmitted signals at the receiver side is straightforward. To accomplish
synchronous switching, rubidium reference oscillators are used at both the transmitter and the receiver.
Timing and switching frame synchronization is established during an initial synchronization process prior
to measurement data recording and must be maintained during the entire measurement.
For channel excitation RUSK uses a multi-carrier spread spectrum signal (MCSSS) with an almost
rectangular shape in the frequency domain. This approach allows precise concentration of the transmitted
signal energy in the band of interest. Simultaneous sounding of multiple bands (e.g., separated up- and
down-link bands in FDD) is supported by setting some spectral magnitudes to zero.
Table 2-5 summarizes the key features of the RUSK TUI-FAU channel sounder.
Table 2-5 Key features of the Medav RUSK TUI-FAU channel sounder.
RUSK TUI-FAU Sounder Property
RF bands
Max. meas. data storage rate
Test signal
Sequence length
Range of values
5…6 GHz
(2x)*160 Mbyte/s
Multi Carrier Spread Spectrum Signal (MCSSS)
256 – 8192 spectral lines, depending on IR length
(defines maximum excess delay)
Number of measurement channels up to 65536 (2 16 )
Measurement modes
Sampling frequency
Spurious free IR dynamic range
Transmitter output
Propagation delay resolution
SISO, SIMO, MIMO
640 MHz at Tx and Rx
48 dB
up to 33 dBm (2 W),
4.17 ns (1/bandwidth)
Impulse response length 0.8 µs – 25.6 µs
RF sensitivity
Control
Post processing
-88 dBm
Windows PC
MATLAB package
Synchronisation rubidium clock with stability of 10 -10
* Rate is doubled with additional disk storage. Second storage enables shorter time gap between Tx-Rx sub-channels.
An overview of measurement-relevant technical data for the antenna arrays used in the TU-Ilmenau
campaigns is given in Table 2-6.
Name
Table 2-6 Overview of TU-Ilmenau antenna arrays.
PULA8
(PULA8@10W)
UCA16 PUCPA24 SPUCPA4x24
Vendor IRK Dresden TU Ilmenau IRK Dresden IRK Dresden
Array structure
Polarization
uniform linear array
dual (vertical+
horizontal)
uniform circular
array
vertical
uniform circular
array
dual (vertical+
horizontal)
stacked uniform
circular array
dual (vertical+
horizontal)
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