Purpose of "Observation Receiver"

Question

What does "observation receiver" means?. 
 I want to know the difference between "receiver" and "observation receiver"

Vinod · Accepted Answer

Observation path by design is intended to be used for Digital pre-distortion (DPD) feedback (observation) path . Detailed specification of ORx path is available in datasheet. 
 Major difference compared to receive (Rx) are ,

AGC is not available in Orx path. 
 The Image rejection and DC offset performance is poor compared to Rx. 
 Bandwidth of 450MHz in Orx path is achieved using ADC stitching. All 4 ADC’s are used to achieve any bandwidth above 225 MHz. 
 QEC performance of ORx path is further degraded for bandwidths above 200MHz. 
 Orx Path is used for Tx tracking calibrations. Tracking calibrations cannot run if time is not allocated for Tx cals. This does not impact TDD and Rx standalone application.)

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Purpose of "Observation Receiver"