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800-900 MHz? Must bee chanel (operator) selective? Intgrated or you can install with far antennas?? I have word on a Small repetater to give coverture to some subterranean parkins. But I need time and luck to find sch.
The idea is simple. Realy 2 amplifiers chains. One with higth power output and imput, and other with LNA imput and medium output. I mean:
Directive antenna ----> LNA -----> Ampli --------> Omni antena
Directive antenna <---- Power amp < --- Amp <----- Omni antena
Omnis can be near and directives must have enougth isolation to garantice no oscilation feedback. Wuth thius schema you get a new small cell near the onmi antennas. Its a simple and easy design for full band repeater. Off course I sugests use filters in each chain, I use diplexters working as up-way-abd and down-way-band.
I hope it give you an idea, because my sch's are from my old company I now I don't have an idea where I put them.