TUTCRIS - Tampereen teknillinen yliopisto


Programmable implementation of zero-crossing demodulator on an application specific processor



Otsikko2013 IEEE Workshop on Signal Processing Systems, SiPS 2013
KustantajaInstitute of Electrical and Electronics Engineers Inc.
ISBN (painettu)9781467362382
TilaJulkaistu - 2013
OKM-julkaisutyyppiA4 Artikkeli konferenssijulkaisussa
Tapahtuma2013 IEEE Workshop on Signal Processing Systems, SiPS 2013 - Taipei, Taiwan
Kesto: 16 lokakuuta 201318 lokakuuta 2013


Conference2013 IEEE Workshop on Signal Processing Systems, SiPS 2013


The zero-intermediate frequency zero-crossing demodulator (ZIFZCD) is extensively used for demodulating continuous phase frequency shift keying (CPFSK) signals in low power and low cost devices. ZIFZCD has previously been implemented as hardwired circuits. Many variations have been suggested to the ZIFZCD algorithm for different modulation methods and channel conditions. To support all these variants, a programmable processor based implementation of the ZIFZCD is needed. This paper describes a programmable software implementation of ZIFZCD on an application specific processor (ASP). The ASP is based on transport triggered architecture (TTA) and provides an ideal low power platform for ZIFZCD implementation due to its simplicity. The designed processor operates at a maximum clock frequency of 250 MHz and has gate count of 134 kGE for a 32-bit TTA processor and 76 kGE for a 16-bit processor. The demodulator has been developed as a part of an open source radio implementation for wireless sensor nodes.