Nt1310 Unit 1 Lab Report

EL 5023/EE4183 Wireless Information Systems Laboratory
Lab #11 Software Defined Radio (SDR) I. Experimental Procedure Equipment List Universal Software Radio Peripheral (USRP) with Flex900 Radio Spectrum analyzer (Agilent E4411 or equivalent) PC with Matlab/Simulink R2011B CAT 6 Ethernet cable SMA(male)-to-BNC Adapter (for spectrum analyzer) 915 MHz Antenna (qty 2) A. INSTRUMENT CONNECTIONS: Connect the antenna to the SMA connector labeled RF1 port on the front of the USRP. Connect another antenna to the spectrum analyzer. Power the USRP with a 6v/3A power adapter. B. CONFIGURE PC: a. Connect the CAT6 cable between the PC and the GB Ethernet port of the USRP. b. Manually set the PC’s Ethernet port IP address under the same subnet mask as the
Run the simulation and measure the new null-to-null bandwidth, you may need to change the Span setting on the spectrum analyzer in order to improve the accuracy of the bandwidth measurement. Save a copy of the spectrum analyzer output. Comment on the changes in the transmitted bandwidth. Stop the simulation. g. Change the Repetition Count back to 10. On the spectrum analyzer, change the Span back to 500kHz. Place the spectrum analyzer in a Max Hold display. Max Hold is found under the Trace menu. After a few traces press the View button on the display key. This process will save the trace to the Trace location 1 on the spectrum analyzer and will be useful for a comparison the filtered spectrum in the next
Change the Repetition block to 1x as the signal will be upsampled in the filter block. c. Run the simulation and observe the frequency domain on spectrum analyzer. Under the Trace Menu, select Trace 2 on the spectrum analyzer and press the Clear/Write key. This will allow a comparison between the two signals. What is the approximate null-to-null bandwidth? Are the sidelobe power levels noticeably reduced? Save a copy for submission. d. Reduce the RRC filter bandwidth by changing the Roll-off Factor to 0.2. Click Visualize filter with FVTool to view the magnitude response. Save a copy of the filter response. Run the simulation. What is the approximate null-to-null bandwidth? Are the sidelobe power levels noticeably reduced? Save a copy of the spectrum analyzer display for submission. Stop the simulation. I. 8-PSK Transmitter In this step, we will change the number of data bits transmitted per symbol by increasing the number of phase states. An 8-PSK modulation scheme uses 8 phase states separated by 45degrees (pi/4) to transmit 3-bits per symbol. Change the M-PSK Modulator Baseband to the following parameters. i. M-ary number: 8 ii. Phase Offset: pi/4 a. Run the simulation and observe the 8-PSK frequency response on spectrum analyzer. Trace 2 will be the 8-PSK spectrum and Trace 1 should be original unfiltered BPSK spectrum. What is the approximate null-to-null bandwidth for the 8PSK signal? Compare the bandwidth of the 8-PSK signal to the bandwidth of the filtered BPSK