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January 2006
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Software Defined Radio

Team members: Luke Vercimak, Karl Weyeneth

A software defined radio is a radio transmitter/receiver that uses digital signal processing (DSP) for coding/decoding and modulation/demodulation. This allows much more power and flexibility when choosing and designing modulation and coding techniques. This project will implement a Digital Software radio receiver with a TI C6700 series of digital signal processor.

Due to hardware availability, both the transmitter and receiver will be implemented on the same DSP evaluation board. The system will be constructed and programmed entirely in Simulink using the embedded target for TI C6000 Simulink library. See deliverables for more information.


Home » Archives » January 2006 » Phase Lock Loop

[Previous entry: "RTDX Interfacing and Testing III"] [Next entry: "Complete QAM and OFDM Transmitter/Reciever"]

01/31/2006: "Phase Lock Loop"


We are going to be using a phased locked loop for the carrier recovery in the Software radio. Much of this information was researched in "Telecommunication Breakdown" by C. Richard Johnson Jr. To properly recover the carrier, two unknown parameters need to be determined. These are the carrier frequency and phase. Johnson describes how the carrier frequency and phase can be recovered using either a cascaded phased locked loop or a single phased locked loop with a higher order fileter inside a single PLL. If properly chosen, it was indicated that this PLL can track modest frequency and phase changes. The choice for this filter is supposed to be detailed in the document Analysis of the Phased Locked Loop in the CD that came with the book.

In the document Analysis of the Phased Locked Loop proof that the PLL converges when simplified linearly. However, there was little discussion of filter choice for a single PLL that tracks both phase and frequency.

A descrete phased lock loop was created out of signal processing blocks in simulink and see how it reacted to modest changes in frequency and phase.

The following test plots in Simulink verify the design.
PLL_results (44k image)
Figure 1 PLL Simulation Results
The two top graphs in figure 1 are the input and output of the PLL respectively. The bottom graph is the input to the VCO. This is consistant with the behavior of a locked PLL. When the frequency difference is increased to 1 Hz.

PLL_cycle_slipping (17k image)
Figure 2 – PLL that is cycle slipping

One hertz is evidentally beyond the capture range for the PLL. More studying will have to be made to determine how the gain block, filter gain, and VCO sensitivity affect the hold-in and capture range of the VCO.


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