Rohde & Schwarz R&S FSL3 - Literature

WiMAX, WiBro Measurements (Options K92/K93) R&S FSL
1300.2519.12 2.158 E-11
RSSI
The received signal strength indicator is determined for each subframe
n
. The computation is based on
the time domain samples
)(ir extracted by the subframe detection block.
2
|)(|~)( irnRSSI (44)
Further RSSI statistics are defined in the standard [5], [6].
dB ))(
ˆ
)(
ˆ
(log5)(
ˆ
0)()1(
ˆ
)1(
0)0(
)(
ˆ
dB )(
ˆ
log10)(
ˆ
0)()1(
ˆ
)1(
0)0(
)(
ˆ
2
RSSI
2
RSSI
(dB)
RSSI
2
avg
2
RSSIavg
2
2
RSSI
RSSI
(dB)
RSSI
avgRSSIavg
RSSI
nnxn
nnRSSInx
nRSSI
nx
nn
nnRSSIn
nRSSI
n
µ/

µµ
µ
µ
=
3
9
3
:
;
>+
=
=
=
9
:
;
>+
=
=
(45)
I/Q Imbalance
The I/Q imbalance estimation block allows to evaluate the
|1| Qbalance gain modulator

+
=
(46)
and the
}1{arg Qmismatch quadrature += (47)
respectively based on the block's estimate
Q
ˆ
 .
Other Measurement Variables
Without going into detail, the OFDMA measurement application additionally provides the following
results:
• Burst power
• Constellation diagram
• Group delay
• I/Q offset
• PAPR
• Pilot BER
• Spectral flatness
Literature
[1] Speth, M., Classen, F., and Meyr, H.: Frame Synchronization of OFDM Systems in Frequency Selective Fading
Channels. IEEE VTC'97, May 1997, pp. 1807–1811.
[2] Schmidl, T. M. and Cox, D. C.: Robust Frequency and Timing Synchronization of OFDM. IEEE Trans. on Commun. Vol.
45 (1997) No. 12, pp. 1613–1621.
[3] Speth, M., Fechtel, S., Fock, G., and Meyr, H.: Optimum Receiver Design for Wireless Broad–Band Systems Using
OFDM – Part I. IEEE Trans. on Commun. Vol. 47 (1999) No. 11, pp. 1668–1677.
[4] Speth, M., Fechtel, S., Fock, G., and Meyr, H.: Optimum Receiver Design for OFDM–Based Broadband Transmission –
Part II: A Case Study. IEEE Trans. on Commun. Vol. 49 (2001) No. 4, pp. 571–578.
[5] IEEE 802.16–2004™: Air Interface for Fixed Broadband Wireless Access Systems (2004).
[6] IEEE Std 802.16e™–2005 and IEEE Std 802.16™–2004/Cor1–2005: Air Interface for Fixed and Mobile Broadband
Wireless Access Systems (2006)