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UART Communication between GSM and GPS

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Aankur:
I want to establish a UART Communication between GSM and GPS.
The Supply Voltage of GPS is 3.3V.
The Supply Voltage of GSM is 3.8V.

The measured RX/TX Voltage Levels of GPS is 2.8V and 0V (for logic High and logic Low).
The measured RX/TX Voltage Levels of GSM is 1.8V and 0V (for logic High and logic Low).

Since there is a difference between RX/TX logic levels of the GSM and GPS, So I am
not able to establish the UART Communication between GSM and GPS.

I am using the interpreter of the telit GSM module to process the data of the GPS.
I am not using any micro-controller to in between the GSM and GPS.

Please suggest me a possible way to perform voltage (or Logic) level shifting.

tox3:
GSM modules usually has output with 1.8V (for example VAUX/PWRMON on Telit LE910), ypu could use it to power level shifter ic.
Not sure about GPS module though. Specific part number would be helpful

mikerj:
Have a look at this TI app note.

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