FLC OF MLG ACR ACFT EXPERIENCED RADIO COM FAILURE DURING DSCNT FROM HIGH ALT RESULTING IN FOLLOWING LOST COM PROC TO LNDG.

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AS STATED ABOVE AT DATE AND TIME; WHILE OPERATING AS FLT XXX; WE LOST COM WITH ALL FACILITIES OUTSIDE OF OUR ACFT. STARTED WITH LOSS OF COM WITH LAX ARTCC AS DSCNT WAS BEING STARTED ON CIVET 3 PROFILE DSCNT. INITIALLY WE THOUGHT THAT WE HAD MISSED A FREQ; SO WE TRIED LAST FREQ. TRIED PRESENT AND LAST FREQS ON OUR OTHER VHF COM. TRIED 10-15 FREQS SELECTED FROM HIGH ALT CHART. TRIED TO CONTACT OTHER COMPANY ACFT ON COMPANY FREQS. INTERMITTENTLY; WE WOULD REGAIN 2-WAY COM WITH ATC; BUT THEN LOSE IT AGAIN WITHIN A MIN OR SO. WE DID HAVE IT LONG ENOUGH TO COPY AND COMPLY WITH SOME RADAR VECTORS AND ALT ASSIGNMENTS. WE ALSO RECEIVED OUR CLRNC FOR THE PROFILE DSCNT; OUR CLRNC FOR THE ILS 25L; AND A LAX TWR XMISSION ON GUARD (121.5) CLRING US TO LAND ON RWY 25L. WE ALSO SET CODE 7600 ON OUR XPONDER; AND USED THE TCASII AND VISUAL CLRING TO MAINTAIN SEPARATION WITH OTHER ACFT DURING THE APCH AND LNDG. AFTER LNDG AND CLRING THE RWY; WE REGAINED COM WITH THE TWR; GND CTL AND COMPANY; BUT LOST IT AGAIN PRIOR TO PARKING AT THE GATE. SUBSEQUENT TELEPHONE CONTACT WITH LAX TWR AND RAPCON CONFIRMED THAT THEY HAD RECEIVED OUR XPONDER CODE 7600 AND THAT THEY WERE SATISFIED THAT WE HAD FOLLOWED THE RECEIVED INSTRUCTIONS AND THE APPLICABLE PORTIONS OF FAR 91.185 AND ATC PROCS -- EMER CORRECTLY; AND RECOMMENDED THAT WE SHOULD HAVE ALSO ATTEMPTED CONTACT WITH THEM ON 121.5. WE AGREE; BUT WONDER IF IT WOULD HAVE HELPED IN OUR GENERALLY COM-FAILED SIT.