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Recent content by semion_z

  1. S

    Problem with Costas Loop Implementation

    I have designed the QPSK transmitter and receiver system in Simulink based on the costas loop implementation. The data rate is 1 MHz. Carrier frequency is 5 MHz. Without any frequency shift the system works well but when I introduce even a small shift, the costas loop is not able to track the...
  2. S

    Frequency Data Multiplexing to Get better Data Rates

    Hello I have a two way data transmission wireless system design. The limitation is the size of antenna on the receiver size that limits the amount od data that can be transmitted from transmitter to receiver. I think about sending the data from transmitter by dividing it to number of narrow...
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    Implementing I/Q Demodulator in System Generator

    Hello I have a simulation of pulsed train that enters to the FPGA design and I want to build the I/Q demodulator block using the System Generator Simulink Tool, in order to translate it later on to FPGA. How it can be done? Thanks a lot.
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    ds89c420 Serial Port problem

    Hi finally i have suceeded in comunicating with my ds89c420 but thre are soe probelms : 1) my last code was written via Keil C language and ds89c420 doesnt understand some C commands like "case" and maybe others. I had to change large prts of the code inside. Does soeone has idea why is that...
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    ds89c420 Serial Port problem

    The program that i greated earlier comunicated with the hardware via the RS232 port at 57600 baud rate. Now I have tried to esteblish comunication with a ds89c420 but didnt succeded in that. I didnt need the bootloader bacause i have a programmer. maybe i need to change something in my...
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    ds89c420 Serial Port problem

    Hi Last Year I have built a project that is based on philips 8xC51RC+ microcontroller from 8051 family. The project works fine but i have recently discovered that the dalls ds89c420 can extremely raise my work spped so i got a couple of them. My system includes some electronics hardware and pc...
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