Compressors, Gas Turbines and Jet Engines
The following is true for an open cycle gas turbine having exhaust heat exchanger. Atmospheric air before entering the compressor is

Exhaust gases drive the compressor
Bled gas from turbine is heated and readmitted for complete expansion
Compressed air before entering the combustion chamber is heated
Heated

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Compressors, Gas Turbines and Jet Engines
In the cross compounding of the gas turbine plant

Both the arrangements can be employed
All are connected in series
H.P. compressor is connected to L.P. turbine and L.P. compressor is connected to H.P. turbine
H.P. compressor is connected to H.P. turbine and L.P. compressor to L.P. turbine

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