Exhibit B Detailed Description of the Measurement System

0112-EX-ST-2004 Images

Georgia Institute of Technology

2004-02-24ELS_64937

Exhibit B. Detailed Description of the Measurement System As illustrated in Figure 1, our MIMO-channel measurement system is composed of two parts: (1) the HP85301B antenna pattern measurement system, used to measure the channel frequency response, and (2) the actuator positioning system, which emulates an arrays at both ends of the link by moving the antennas to arbitrary pre-programmed locations. The actuator controller moves the antennas to a pair of specified positions, and then the channel is measured. This procedure is repeated until all the desired antenna positions have been sampled. The details of the components are listed in Table 1. The last column of the table lists the maximum rated outputs of the components. Each trial of the experiment is expected to take about 30 minutes. We plan to perform trials in many different locations within the buildings specified in Exhibit A. Actuator Positioning System Driven by three brushless motors, the actuators can translate the antenna through a volume of approximately 50cm × 50cm × 7cm. The 7cm in the Z-direction ensures that the angles of paths arriving at nearly all elevations can be identified. For convenience, a mobile platform is also prepared to move both actuator systems to various locations. The design of actuator and mobile platform systems are demonstrated in Figure 2 and 3, respectively. The antennas are mounted on plastic telescoping masts such that the receive antenna can be positioned at heights ranging from 4 to 5 feet from the floor and the transmit antenna can be positioned at heights ranging from 4.5 to 5.5 feet from the floor. A photograph of the system is shown in Figure 4.

Transmitter Receiver 50 meters FLM5972 12F Cart 3 Cart 1 Cart 2 HP85309A HP8530 HP83020A Computer HP83631B HPIB Interface Figure 1. MIMO channel measurement system.

Table 1. HP85301B measurement system specifications . Component Equipment Functions & Specs Frequency range : 0.045 – 26.5GHz Max. output power : < 20 GHz, +13 dBm Transmit source HP83631B synthesized sweeper Resolution : 20-26.5 GHz, +10 dBm : 1 Hz Frequency range : 2 –26.5 GHz HP87422 power supply and Amplifier Gain : 30 dB HP83020A power amplifier Max. output power : 30 dBm Frequency range : 5.9 – 7.2 GHz Fujitsu Amplifier Gain : 9.5 dB FLM5972 12F post amplifier Max. output power : 41.5 dBm Frequency range : 0.045 – 20GHz LO source HP83621B synthesized sweeper Max. output power : +13 dBm Resolution : 1 Hz Downconvert RF signal to IF band HP85320A/B Mixers Sensitivity : -113 dBm RF Dynamic range : 89 dB downconverter HP85309A LO/IF distribution 1. Receive LO source and provide it to the mixers 2. Receive IF signals and send it to the microwave unit receiver HP 8530A microwave receiver 1. Synchronize and control the RF transmitter and Microwave the RF receiver (HP85101C Display/Processor + 2. Receive and display the IF signal receiver HP85102R IF/Detector) 3. Send the data to computer Type : Biconical Frequency range : 2-18 GHz Polarization : Vertical Gain : 2.6 dB at 5.5GHz Antenna (for Tx EM 6865 omni-directional 3.5 dB at 17.0 GHz & Rx) wideband antenna Max. power : 5W VSWR : <2:1 Output impedance: : 50Ω Interface : Type “N” female Weight : 1 lbs

9.53” 28.5” Z-Axis 7.72” 31.5” Y-Axis 9.29” 9.53” X-Axis Figure 2. Three-dimensional actuator positioning system. 6” 13.5” 35.1” 27.1” 20” Figure 3. Mobile platform.

Figure 4. In the forground, the actuator system and the antenna on the telescoping mast. Behind the actuator system is a cart holding the HP8530A microwave receiver and other components.


Document Created: 2004-02-24 14:38:41
Document Modified: 2004-02-24 14:38:41
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