Michael Feilen Symposium zur DAB/DRM+-Sende-Infrastruktur KL
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1 Michael Feilen
2 Michael Feilen
3 Outline Introduction to Wavesink Architecture Performance DAB vs. DRM (incoherent vs. coherent) DRM+ in VHF III
4 What is Wavesink? Software-defined VHF radio demodulator FM/RDS, DRM+, DAB+ Fixed-point C Cross-platform UI RF frontends: USRP, RTL2832, Funcube, RAW
5 Architecture Wavesink App
6 Architecture RF driver SDL Wavesink App Audio driver
7 Architecture RF driver Network Handling Screen Rendering SDL Event Processing Android JNI Audio driver Wavesink App
8 Architecture RF Interface Receiver Management Interface Audio Interface RF driver Network Handling Screen Rendering SDL Event Processing Android JNI Audio driver Wavesink App
9 Architecture RF Interface RF Monitoring Demod Service Mgmt. Data Mgmt. Receiver Management Interface Audio Buffer Mgmt. Audio Interface RF driver Network Handling Screen Rendering SDL Event Processing Android JNI Audio driver Wavesink App
10 Architecture RF post-processor Srv. DB Data DB Audio pre-processor RF Interface RF Monitoring Demod Service Mgmt. Data Mgmt. Receiver Management Interface Audio Buffer Mgmt. Audio Interface RF driver Network Handling Screen Rendering SDL Event Processing Android JNI Audio driver Wavesink App
11 Architecture source Baseband Proc. IF sink RF Interface RF Monitoring proc() RF post-processor Srv. DB Data DB Audio pre-processor Demod Service Mgmt. Data Mgmt. Receiver Management Interface Audio Buffer Mgmt. Audio Interface RF driver Network Handling Screen Rendering SDL Event Processing Android JNI Audio driver Wavesink App
12 Architecture source DAB DRM+ FM/RDS Baseband Proc. IF... sink RF post-processor RF Interface RF Monitoring proc() Demod Srv. DB Data DB Audio pre-processor Service Mgmt. Data Mgmt. Receiver Management Interface Audio Buffer Mgmt. Audio Interface RF driver Network Handling Screen Rendering SDL Event Processing Android JNI Audio driver Wavesink App
13 FM/RDS Demod CMA channel equalizer PLL demod with IIR-phase equalizer Pilot PLL with group delay equalizer SNR-based difference-signal weighting Coherent DBPSK RDS demodulator with phase and amplitude tracking
14 DRM+ Demod Demod not 192 khz based (faster) :) Bilinear channel estimation (no MMSE) Clock, frequency, time offset tracking LLR energy tracking Soft-decision Viterbi decoding (no MLC dec.) DCP MDI output
15 DRM+ Performance Wavesink DRM+, r=1/2, EEP, QPSK
16 DAB+ Demod Optimized FFT with combined deinterleaving Frequency, time offset tracking Soft-decision Viterbi decoding IR estimation
17 DAB+ Performance Wavesink DAB+, r=1/2, EEP, DQPSK Mean BER C/N in db
18 And now... to something somewhat different
19 Coherent (DRM) vs. Incoherent (DAB) Quelle: Wikipedia
20 Coherent (DRM) vs. Incoherent (DAB) Quelle: Wikipedia 2,5 db performance BER 10^-4
21 Coherent (DRM) vs. Incoherent (DAB)
22 Coherent (DRM) vs. Incoherent (DAB) 2,5 db performance difference
23 DRM+ in VHF Effect of frequency offset DRM+ Noise 0 Hz f
24 DRM+ in VHF Effect of frequency offset DRM+ DRM+ Noise Noise 0 Hz f 0 Hz f
25 DRM+ in VHF Effect of frequency offset Lost signal energy DRM+ DRM+ Noise Noise 0 Hz f 0 Hz f
26 DRM+ in VHF Effect of frequency offset Lost signal energy DRM+ DRM+ Noise Noise 0 Hz f 0 Hz f Can cause problems during acquisition
27 DRM+ in VHF DRM+ clock accuracy requirements (max. 5% signal power loss) clock offset ppm Tx. frequency in MHz
28 DRM+ in VHF
29 DRM+ in VHF Receiver moves Doppler freq. shift Doppler shift Time-selective fading Pilot-period in time must satisfy Shannon- Nyquist theorem (channel estimation)
30 DRM+ in VHF Receiver moves Doppler freq. shift Doppler shift Time-selective fading Pilot-period in time must satisfy Shannon- Nyquist theorem (channel estimation)
31 DRM+ in VHF Receiver moves Doppler freq. shift Doppler shift Time-selective fading Pilot-period in time must satisfy Shannon- Nyquist theorem (channel estimation)
32 DRM+ in VHF Receiver moves Doppler freq. shift Doppler shift Time-selective fading Pilot-period in time must satisfy Shannon- Nyquist theorem (channel estimation) f t dt
33 DRM+ in VHF DRM+ mobile rx performance max. velocity in km/h Tx frequency in MHz
34 Conclusion Low-cost software-defined receiver available SDR allows update functionality (no new HW) Internet backlink on smartphones DRM+ feasible for VHF Band III
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