Title :
Reduction of error floor of differential PSK in mobile radio channels by adaptive sampling
Author :
Molisch, Andreas F. ; Bonek, Ernst
Author_Institution :
Inst. fur Nachrichtentech. und Hochfrequenztech., Tech. Univ. Wien, Austria
fDate :
11/1/1998 12:00:00 AM
Abstract :
We investigate the error floor of both differential BPSK and differential π/4-QPSK with adaptive sampling in two-delay fading channels where the excess delay is smaller than a bit length. For “basic” DBPSK (i.e., using rectangular pulseshape), the error floor can be eliminated completely, but has finite values for pulses with raised-cosine spectrum. For a/4 DQPSK, the error floor is reduced by only a factor on the order of two as compared to fixed sampling
Keywords :
adaptive signal processing; delays; differential phase shift keying; error statistics; fading channels; land mobile radio; quadrature phase shift keying; signal sampling; DPSK; adaptive sampling; bit length; differential π/4-QPSK; differential PSK; error floor reduction; excess delay; fixed sampling; mobile radio channels; mobile radio systems; raised-cosine spectrum; rectangular pulseshape; two-delay fading channels; Delay; Fading; GSM; Intersymbol interference; Land mobile radio; Local oscillators; Phase shift keying; Radio frequency; Radio transmitters; Sampling methods;
Journal_Title :
Vehicular Technology, IEEE Transactions on
