turkelb
Newbie level 3
Hi,
I am working on a WiMAX project. My jobs is to handle ADC/DAC interface. I am not familiar to Signal Processing. So i need your experiences about filtering.
I have search about WiMAX and decimation a lot. We implement 10 MHz,
1024 FFT WiMAX system. In our design, analog signal is sampled at 40 MHz. Oversampled by 4 times. So in digital world, first we should filter the signal by LPF and then take one sample from every four samples. I am working on TMSC6455 DSK. I have mesaured TI's DSPLib filtering functions and my owns. Since OFDM symbol duration is 103 us and this is a real-time application, the best filter i can design can be 120 tabs. I don't have any experience on Filtering. So I am worry if 120 tabs FIR filter can be used for OFDM-WiMAX application? Is 120 tabs FIR filter enough for 10 MHz WiMAX system?
Burhan TURKEL
R&D - TG03
Nortel Netas
Alemdag Cad. No:171
34768 Umraniye
Istanbul – Turkey
Tel: +90 (216) 522 5632
bturkel@netas.com.tr
I am working on a WiMAX project. My jobs is to handle ADC/DAC interface. I am not familiar to Signal Processing. So i need your experiences about filtering.
I have search about WiMAX and decimation a lot. We implement 10 MHz,
1024 FFT WiMAX system. In our design, analog signal is sampled at 40 MHz. Oversampled by 4 times. So in digital world, first we should filter the signal by LPF and then take one sample from every four samples. I am working on TMSC6455 DSK. I have mesaured TI's DSPLib filtering functions and my owns. Since OFDM symbol duration is 103 us and this is a real-time application, the best filter i can design can be 120 tabs. I don't have any experience on Filtering. So I am worry if 120 tabs FIR filter can be used for OFDM-WiMAX application? Is 120 tabs FIR filter enough for 10 MHz WiMAX system?
Burhan TURKEL
R&D - TG03
Nortel Netas
Alemdag Cad. No:171
34768 Umraniye
Istanbul – Turkey
Tel: +90 (216) 522 5632
bturkel@netas.com.tr