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BATTERY SAVING THROUGH DYNAMIC SELECTION OF DEMODULATION TECHNIQUE

IP.com Disclosure Number: IPCOM000009562D
Original Publication Date: 1999-Sep-01
Included in the Prior Art Database: 2002-Sep-03
Document File: 1 page(s) / 50K

Publishing Venue

Motorola

Related People

Richard C. Lucas: AUTHOR [+2]

Abstract

A radio receiver uses estimates of Received Signal Quality to dynamically select only simple limiter/discriminator detection when the additional sensitivity of coherent detection is not required. This reduces computational battery dram.

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DeveIopment.s Technical 0 M MOTOROLA

BATTERY SAVING THROUGH DYNAMIC SELECTION OF DEMODULATION TECHNIQUE

by Richard C. Lucas and Robert Furtaw

ABSTRACT PROPOSED SOLUTION TO THE PROBLEMS

  A radio receiver uses estimates of Received Signal Quality to dynamically select only simple limiter/discriminator detection when the additional sensitivity of coherent detection is not required. This reduces computational battery dram.

INTRODUCTION

  Traditional 2 Way radios use simple discrimina- tor/limiter receivers. More complex communication schemes such as GSM use coherent detection. This paper describes ways of achieving the benefits of more complex schemes without some of the draw- backs.

PROBLEMS TO BE SOLVED

  Coherent demodulation can provide sensitivity over simple discriminator/liter detection, but does so at a cost of increased complexity of the receiver. This results in increases both in delay and in compu- tational current drain.

  During normal, strong signal strength condi- tions, the receiver would employ a simple discrhni- natorflimiter receiver. This receiver would provide estimates of the Received Signal Quality, in terms of variance from phase state, received signal strength indicator, and decoded bit errors.

  When the Received Signal Quality starts drop- ping rapidly, as in a fade, or in marginal coverage conditions, the receiver would then switch to coher- ent detection to provide greater sensitivity. The pro- tocol used must allow for coherent detection in terms...