How to increase range of PIR sensor

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Hi, I want to build a motion sensor by PIR sensor and NCS36000 as its driver. I used the typical circuit in the datasheet of NCS36000 and a Frensel lens,but I have short range (maximum 4m) that PIR can detect motion. How can I increase this range to about 7-8 meters. The range is dependent on what components?! My PIR part number is D203B.
this is the datasheet and typical circuit.


 
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You see that the amplifier gain can be adjusted according to the application.

The achievable range is however mostly limited by sensor noise, the usual means to achieve a wide sensor range is a different (single zone, large aperture) Fresnel lens.
 
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