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Multicarrier basestation with PA having DC supply adjusted according to the number of carriers.

IP.com Disclosure Number: IPCOM000190987D
Original Publication Date: 2009-Dec-11
Included in the Prior Art Database: 2009-Dec-11
Document File: 2 page(s) / 121K

Publishing Venue

Motorola

Related People

Hansen, Niels: INVENTOR [+2]

Abstract

The proposed solution to the efficiency problem is to simply let the DC power supply to the multi carrier PA depend on the number of carriers in use. The supply voltage should be selected so that the efficiency is maximized for the given number of carriers.

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Multicarrier basestation with PA having DC supply adjusted according to the number of carriers.

By Niels Hansen, Mikkel C.W. Hoyerby

Motorola, Inc.

EMS

 

ABSTRACT

The proposed solution to the efficiency problem is to simply let the DC power supply to the multicarrier PA depend on the number of carriers in use.

The supply voltage should be selected so that the efficiency is maximized for the given number of carriers.

 

PROBLEM

In modern digital transmitters for basestations there is a need to provide more than one carrier on a given site. Typically there is a need for one or more carriers with the option of expanding the number of carriers as traffic increases.

Traditionally single carriers are created in a baseradio having a power amplifier. A number of these are then combined and fed to the antenna. There is thus one power amplifier per carrier. Expansion is done by adding baseradios and expanding the combiner.  

A more advance method that has seen use in later years is to have multiple carries created in a single baseradio and fed to the antenna via a single power amplifier. Expansion is done simply by adding another carrier in the baseradio. This could be done by  simply reconfiguring the software or adding another  hardware modem to the system. A sketch of such a system is shown in Figure 1 with 3 carriers.

Figure 1

Typically the power...