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A technique to reduce WCDMA cellphone power consumption (Linearity on Demand)

IP.com Disclosure Number: IPCOM000168001D
Publication Date: 2008-Feb-27
Document File: 2 page(s) / 18K

Publishing Venue

The IP.com Prior Art Database

Abstract

A method to reduce the current used by a WCDMA receiver by dynamically varying the linearity of the receiver in response to changes in the transmitted power level.

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Title 

A technique to reduce WCDMA cellphone power consumption (Linearity on Demand)

Abstract 

A method to reduce the current used by a WCDMA receiver by dynamically varying the linearity of the receiver in response to changes in the transmitted power level.   

Body 

In the transceiver of a WCDMA mobile station (MS) the transmitter and receiver are simultaneously active albeit at different frequencies.  This means that any portion of the transmitted signal that is incident at the receiver can interfere with the primary function of the receiver which is to receive the signal sent by the base station (BS).  The presence of a high power interfering signal requires the receiver to be highly linear in order that the interferer be successfully rejected.  Providing high linearity typically will also increase the current consumption of the receiver. 

In a WCDMA cellular network the network will attempt to keep all MSs at the minimum possible transmit power in order to limit mutual interference between different MSs.  This means that an MS will typically only spend a small portion of time transmitting at high powers.   Consequently it is undesirable to design a receiver with high linearity solely to deal with this small portion of time as this will incur an unnecessarily high current penalty. 

Figure 1 illustrates an algorithm which can...