Laterizio

mo/demodulatore ssb digitale

laterizio e' un modulatore e demodulatore per SSB a metodo weaver implementato su un DSP a basso consumo, per RTX radio portatili

In ricezione, i segnali complessi I e Q vengono campionati simultaneamente su due ADC con risoluzione di 10bit e frequenza di 20Khz, filtrati con un filtro FIR, e moltiplicati con un oscillatore numerico in quadratura. I due segnali vengono poi sommati o sottratti a seconda della banda laterale desiderata.

• http://www.hanssummers.com/weaver.html
• http://stor1.nonoo.hu/hamdsptutorial/weavermethod.pdf

uC

http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en532298 dsPIC33FJ128GP802

• RAM: 16K
• Flash: 128K
• Timers: 5
• UART: 2
• primitive DSP
• ADC 10/12bit
• DAC 16bit

Usa il layout di CodecBoard16

possibili alternative:

• http://www.st.com/content/st_com/en/products/microcontrollers/stm32-32-bit-arm-cortex-mcus/stm32f3-series/stm32f373.html?querycriteria=productId=LN10

Letture

Phasing method:

• http://www.ece.umd.edu/~tretter/commlab/c6713slides/ch7.pdf
• http://www-inst.eecs.berkeley.edu/~ee120/fa99/notes/notes15.pdf
• http://www.katjaas.nl/hilbert/hilbert.html
• https://www.ece.uvic.ca/~elec350/lab_manual/data/SSB_theory.pdf
• http://www.dg5mk.de/pages/artikel/content-in-english-language/fft-ssb-modulation-and-demodulation---how-it-works.php
• http://tlfabian.blogspot.it/2013/01/implementing-hilbert-90-degree-shift.html
• http://rheslip.blogspot.it/2014/04/teensy-sdr-implementing-image.html
• https://it.mathworks.com/help/signal/examples/single-sideband-modulation-via-the-hilbert-transform.html
• http://www.moetronix.com/dspic/
• http://ae6ty.com/Papers_files/SDR-QrpQuarterly-Part-3.pdf
• http://forums.parallax.com/discussion/132977/hilbert-transform-prop-dsp
• http://www.dsprelated.com/showarticle/176.php

Weaver method:

• http://dp.nonoo.hu/projects/ham-dsp-tutorial/11-ssb-weaver/
• http://home.comcast.net/~w1qg/fpga_dsp1.pdf
• http://www.radioexperimenter.us/re-09-1993/a-weaver-method-ssb-modulator-using-dsp.html
• http://www.microtelecom.it/ssbdex/ssbdex-e.htm

• http://homepage.ntlworld.com/johngduffy/Project/Chapter2.htm#Multi
• http://zimmer.fresnostate.edu/~pkinman/pdfs/Receiver%20Architectures.pdf
• http://cdn.intechopen.com/pdfs/9961/InTech-Receiver_front_end_architectures_analysis_and_evaluation.pdf