1. Experiments with an 802.11n Radio Testbed
July 2005
doc.: IEEE /0701r1
July 2005
Experiments with an n Radio Testbed
Date:
Authors:
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David Browne, UCLA UnWiReD Lab
David Browne, UCLA UnWiReD Lab

2. July 2005
doc.: IEEE /0701r1
July 2005
Abstract
Present a software defined MIMO-OFDM testbed with n functionality.
Present a channel sounding scheme that can be integrated into n testbeds.
Demo simultaneous channel sounding and n measurements on the testbed via internet.
Present results from a measurement campaign in which a comparison was made between proposed n modem/codec schemes.
David Browne, UCLA UnWiReD Lab
David Browne, UCLA UnWiReD Lab

3. Experiments with an 802.11n Radio Testbed
July 2005
Experiments with an n Radio Testbed
U n W i R e D L a b
UCLA Wireless Research and Development
(in collaboration with STMicroelectronics)
Michael Fitz
David Browne, Weijun Zhu
David Browne, UCLA UnWiReD Lab

4. July 2005
Outline
Present a software defined MIMO-OFDM testbed with n functionality.
Present a channel sounding scheme that can be integrated into n testbeds.
Demo simultaneous channel sounding and n measurements on the testbed via internet.
Present results from a measurement campaign.
David Browne, UCLA UnWiReD Lab

5. MIMO-OFDM Radio Testbed
July 2005
MIMO-OFDM Radio Testbed
David Browne, UCLA UnWiReD Lab

6. MIMO-OFDM Radio Testbed
July 2005
MIMO-OFDM Radio Testbed
David Browne, UCLA UnWiReD Lab

7. MIMO-OFDM Radio Testbed
July 2005
MIMO-OFDM Radio Testbed
Radios
digital baseband
4 x 4 MIMO
fc = 2.4GHz
20MHz bandwidth
120Mbps throughput
3% EVM
internet control
David Browne, UCLA UnWiReD Lab

8. MIMO-OFDM Radio Testbed
July 2005
MIMO-OFDM Radio Testbed
Robots
spatial positioning
70cm x 70cm grid
1.59mm precision
LEGO
internet control
Antenna Arrays
variable geometry
dipoles, patches
compact MIMO arrays
David Browne, UCLA UnWiReD Lab

9. MIMO-OFDM Radio Testbed
July 2005
MIMO-OFDM Radio Testbed
Fair comparison of MIMO-OFDM signaling schemes
Multipath distortion
Phase noise
Frequency offset
Non-linear amplifiers
Antenna mutual coupling
...
Method:
simultaneous channel sounding and data transmission
David Browne, UCLA UnWiReD Lab

10. Field Test - General Frame Structure
July 2005
Field Test - General Frame Structure
802.11a Preamble for timing and frequency estimation.
Flexible structure for testing different MIMO-OFDM schemes simultaneously.
Implemented algorithms include Spatial multiplexing and space-time blocking coding, LDPC/BCC/Space-time trellis coding, etc. Lots of key algorithms related to the TGn proposals have been implemented and tested.
David Browne, UCLA UnWiReD Lab

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References
David Browne, UCLA UnWiReD Lab