DA40 PLT REPORTS NMAC WITH C172.

Narrative

I WAS DSNDING INTO 7B2; WITH VFR FLT FOLLOWING FROM 11500 FT. HAD BEEN HANDED OFF FROM ZBW TO ALB APCH TO BDL APCH. I WAS UNABLE TO READ BDL ON THE ASSIGNED FREQ; BUT COULD HEAR THEM INTERMITTENTLY CALLING OTHER ACFT. THE WX WAS VFR WITH SCATTERED TO BROKEN CUMULUS. I WAS MANEUVERING TO REMAIN VFR. MY ACFT IS TIS EQUIPPED; AND I WAS RECEIVING INTERMITTENT HITS OF AN ACFT BELOW AND BEHIND ME. AS I WAS DSNDING THROUGH 5500 FT; I TURNED OFF THE SQUELCH AND WAS ABLE TO RAISE BDL. HE ADVISED OF TFC NEAR ME BUT SAID IT MIGHT BE A GHOST IMAGE. I THEN GOT A TIS ALERT AND SAW THE ACFT AT MY 8 O'CLOCK POS PASSING DIRECTLY OVER ME IN A SE DIRECTION. RPTED TO BDL. ACFT WAS NOT COMMUNICATING WITH HIM (NOR WAS HE REQUIRED TO). NO EVASIVE ACTION ON MY PART NOR ON THE OTHER ACFT'S. CONTRIBUTING FACTOR MAY ALSO HAVE BEEN FATIGUE; AS I WAS RETURNING FROM A TRIP; WITH SEVERAL STOPS TO DROP OFF PAX; AND HAD BEEN AT 11500 FT FOR ABOUT 2 HRS. I AM A NON SMOKER AND A RUNNER; BUT STILL HAD TO BE SOMEWHAT AFFECTED.