With A Hardware Demonstrator. MIMO Channel Measurements. Department of Communications Engineering. University of Bremen.
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1 Jacobs Bremen Summer School Progress in Mathematics for Communication Systems Bremen, July 3rd, 27 MIMO Channel Measurements With A Hardware Demonstrator Henning Paul Department of Communications Engineering
2 Short Overview On The ANT Department of Communication Engineering (Arbeitsbereich Nachrichtentechnik, ANT ) is part of the Institute of Telecommunications and High-Frequency Techniques (ITH) Head of Department: Prof. Dr.-Ing. K.-D. Kammeyer 1 Post-Doc, 8 Ph.D. students Main focus of research: Mobile Communications, Adaptive Systems, OFDM, CDMA, MIMO, Blind/Semi-blind Channel Estimation, Cross Layer Optimization, Speech Processing, Multiple Antenna System for ISM Band Transmission (MASI) Henning Paul 2
3 Motivation Properties of MASI Measurement Results Future Research Topic Outline Henning Paul 3
4 Motivation Simulations use ideal assumptions These assumptions can be verified by measurements employing the hardware demonstrator Usage of off-the-shelf components that are also being used in commercial products Thus, realistic transmission conditions can be achieved Multiple Antenna System for ISM Band Transmission Henning Paul 4
5 Properties of MASI 19 rack mount technology, individually extensible (1 to 8 channels) Transmission band: 2.4GHz ISM band (1MHz channel grid / 8 frequencies possible) Transmit power: +2dBm (1mW) per channel Zero-IF modulator & demodulator circuits (Analog Devices AD8346/8347) Analog I/Q baseband bandwidth: 16MHz (due to hardware filters) 12 bit DAC (Analog Devices AD 9765), 12 bit ADC (AD 9432) Sampling frequency 1MHz, 4MHz, 5MHz, PLL clock and external Maximum sampling depth (Tx) / (Rx) I/Q samples Connection to PC (control and data transfer) via USB for offline signal processing usingmatlab Henning Paul 5
6 Results of Frequency Response Measurements -2-4 TX=1 TX=2 TX=3 TX= Transmission of chirp signals over transmit antennas in multiplex magnitude in db RX= magnitude in db RX= magnitude in db RX= magnitude in db RX= f in MHz f in MHz f in MHz f in MHz Henning Paul 6
7 Measurement Of MIMO Channel Matrices Transmission of Zadoff-Chu pilot sequences with f samp = 5MHz, T symb = 8/f samp, f LO = 2.44GHz in time multiplex over transmit antennas Receiver-side signal processing (Frame detection, carrier offset correction, symbol clock synchronization, downsampling) Calculation of 15 estimates of channel matrixhper frame Eigenvalue decomposition of receiver side channel correlation matricesr HH,R =E{HH H } and R HH,T =E{H H H} yield eigenvectors and eigenvalues describe spatial propagation characteristics can be presented as beam patterns Henning Paul 7
8 Measurement Campaigns Measurement of 4x4 ULA system, rotation of receive array in 1 steps between frames Henning Paul 8
9 Beam Patterns for Line-of-Sight Transmission Henning Paul 9
10 Beam Patterns for Non-LoS Case Henning Paul 1
11 Future Research Topic: OFDM for Optical Media OFDM allows parallel signal processing for equalization Problems: Nonlinearities Nonlinearity of components such as Mach-Zehnder Modulator and photo diode MZM GI P/S... Map IFFT * S/P Power (envelope) detection ( incoherent ) leads to nonlinear distortions SSB Nonlinearity of optical channel itself S/P GI FFT... Demap... P/S Henning Paul 11
12 Optical Channel Models Optical channel models are supplied by our cooperation partner ( of Kiel) Nonlinear effects to be modelled: Kerr effect, Self Phase Modulation, Cross Phase Modulation, Four Wave Mixing, Stimulated Raman Scattering Henning Paul 12
13 Thank you for your attention! Henning Paul 13
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