Symbol Timing Synchronization Part II: Over-the-air Testing ELEC - - PowerPoint PPT Presentation

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Jun 23, 2023 27 likes •107 views

Symbol Timing Synchronization Part II: Over-the-air Testing ELEC 433 Evan Everett and Michael Wu March 12, 2013 Design Thus Far Rx Chain Tx Chain Modulator Down- Pulse-Shaping Decimating Up- converter

SLIDE 1

Symbol Timing Synchronization Part II: Over-the-air Testing

ELEC 433 Evan Everett and Michael Wu March 12, 2013

SLIDE 2

Design Thus Far

Modulator Up- converter Pulse-Shaping Filter Timing Synch Carrier Recovery Down- converter Decimating Matched Filter

∼ ∼ ∼ ∼ ∼ ∼

Tx Chain Rx Chain Variable delay artificial CFO

SLIDE 3

This Week: Standalone Transceiver

WARP Radio Modulator Up- converter Pulse-Shaping Filter Timing Synch Carrier Recovery Down- converter Decimating Matched Filter

∼ ∼ ∼ ∼ ∼ ∼

Tx Chain Rx Chain

Transmit to or receiver from

another board

Correct real carrier and timing
ffsets

SLIDE 4

Modulator Up- converter Pulse-Shaping Filter Timing Synch Carrier Recovery Down- converter Decimating Matched Filter

∼ ∼ ∼ ∼ ∼ ∼

Tx Chain Rx Chain

Connect Tx to radio DAC
Connect RX to radio ADC
Both 12 bits

Fix12_11

Step 1: Ports in Sysgen

To radio DAC From Radio ADC

SLIDE 5

Step 2: Connect to Radio in XPS

Same steps as your previous model
Connect to WARP radio ports to your model pors like you

connected to DAC ports by editing the .mhs file

PORT user_RFA_RXD_I = net_gnd PORT user_RFA_RXD_Q = net_gnd PORT user_RFA_TXD_I = net_gnd PORT user_RFA_TXD_Q = net_gnd

SLIDE 6

Step 2: Connect to Radio in XPS

Same steps as your previous model
Connect to WARP radio ports to your model pors like you

connected to DAC ports by editing the .mhs file

PORT user_RFA_RXD_I = radioA_Rx_I PORT user_RFA_RXD_Q = radioA_Rx_Q PORT user_RFA_TXD_I = radioA_Tx_I PORT user_RFA_TXD_Q = radioA_Tx_Q ... PORT radio_dac_i = radioA_Tx_I PORT radio_dac_q = radioA_Tx_Q PORT radio_adc_i = radioA_Rx_I PORT radio_adc_q = radioA_Rx_Q Names of your gateways arbitrary net names

SLIDE 7

Step 3: C-code to Control Transceiver

Switch between Tx and Rx modes
Enable/Disable CFO correction and timing correction
Vary transmit and receive amplifier gains
Vary carrier frequency
Look at signals in various parts of design (already

implemented)

SLIDE 8

Other information

Template C code for transceiver controller is online
Made need to retune filter coefficients for CFO and timing
Make sure you can write the values from software
Make sure you can reset CFO and timing correction loops
Will need to share boards