Справочник Пользователя для Andrew Wireless Innovations Group RPT-NODEC1943

5 Functional Description 

 

ID No: 161692 

PRELIMINARY 

Page 71

 

 
In the primary uplink path, a signal originating from the mobile is separated from the 
downlink signal via the primary UL IN duplexer. It is then amplified by an integrated 
low noise amplifier (LNA) and forwarded to the uplink digital channel module (DCM). 
The DCM down-converts the signal to base-band, digitally filters it, amplifies it and 
then up-converts it. In addition the interference cancellation technology is 
implemented in the DCM. Finally, the signal is sent to the final amplifier and 
combined with the downlink input signal in the DL IN duplexer. The optional diversity 
uplink path (via a second filter) is identical except signals enter via the diversity UL IN 
duplexer and are combined in the DCM with the primary path.  

 

In the downlink path, a signal originating from the base station is separated from the 
uplink signal in the DL IN duplexer. It is then amplified by an integrated low noise 
amplifier (LNA) and forwarded to the downlink digital channel module (DCM). The 
DCM down-converts the signal to base-band, digitally filters it amplifies it and then 
up-converts it. In addition the interference cancellation technology is implemented in 
the DCM. Finally, the signal is sent to the final amplifier and combined with the uplink 
input signal in the primary UL IN duplexer. The downlink DCM is also responsible for 
communication and control of the entire unit. Using a Node C 1943 as an example, 
the following figure illustrates the positions of the RF components inside the Node C.