Optimizing resolution of signals in a low-IF receiver
2007 (English)In: ISSCS 2007: International Symposium on Signals, Circuits and Systems, Vols 1 and 2, 2007, 349-352 p.Conference paper (Refereed)
The resolution of the digital signal path has a crucial impact on the design, performance and the power dissipation of the radio receiver data path, downstream from the ADC. The ADC quantization noise has been traditionally included with the Front End receiver noise in calculating the SNR as well as BER for the receiver. Using the IEEE 802.15.4 as an example, we show that this approach leads to an over-design for the ADC and the digital signal path, resulting in larger power. More accurate specifications for the front-end design can be obtained by making SNRreq a function of signal resolutions. We show that lower resolution signals provide adequate performance and quantization noise alone does not produce any bit-error. We find that a tight bandpass filter preceding the ADC can relax the resolution requirement and a I-bit ADC degrades SNR by only 1.35 dB compared to 8-bit ADC. Signal resolution has a larger impact on the synchronization and a 1-bit ADC costs about 5 dB in SNR to maintain the same level of performance as a 8-bit ADC.
Place, publisher, year, edition, pages
2007. 349-352 p.
noise figure, ADC, BER, demodulator, synchronization
IdentifiersURN: urn:nbn:se:kth:diva-77387DOI: 10.1109/ISSCS.2007.4292734ISI: 000250471700090OAI: oai:DiVA.org:kth-77387DiVA: diva2:491533
International Symposium on Signals, Circuits and Systems. Lasi, ROMANIA. JUL 12-13, 2007
QC 201202082012-02-062012-02-062012-02-08Bibliographically approved