Hi!
I dont have knolodge about Your transceiver, but in general case for add LNA and PA, Your transceiver must have two rf physical circuits separated, one for transmittion and other for reception. Other requeriments are referent in relation about the impedance, most commom are 50R, others parameters are important and must be following for best performance.
Freescale and maxim have excelent devices for Your application, with many application notes explain more details about how implemented...
Gorkin.