Optimizing resolution of signals in a low-IF receiver

Dwivedi, Satyam and Amrutur, Bharadwaj and Bhat, Navakanta (2007) Optimizing resolution of signals in a low-IF receiver. In: IEEE ISSCS 2007, Romania, Europe, 13-14 July 2007 , Romania.

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Abstract

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 SNRreg 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 1-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.

Item Type:	Conference Paper
Publisher:	IEEE
Additional Information:	Copyright 2007 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.
Keywords:	Noise Figure;ADC;BER;Demodulator;Syn-chronization.
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	17 Oct 2011 06:28
Last Modified:	17 Oct 2011 06:28
URI:	http://eprints.iisc.ac.in/id/eprint/41426

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