A software simulation tool has been developed to simulate the performance of
digital mobile radio systems in fading channels. The simulation tool generates
average bit error rate (BER) and bit-by-bit error patterns with user-specified
parameters. The simulation tool can simulate various communication system
parameters (i.e. modulation scheme, data rate, signal to noise ratio, and receiver
speed, etc.) and different channel environments (i.e. outdoor and indoor fading
channels). Additive white Gaussian noise and co-channel interference effects for
outdoor channels are also simulated. Using the simulation tool, we studied
average BER results for FSK, BPSK, and π /4 DQPSK with Nyquist pulse shaping
in indoor and outdoor, flat and frequency-selective fading channels. The BER
performance of π / 4 DQPSK using the data rate and the pulse shaping requirement
in the U.S. Digital Cellular Standard are studied. BER results for high data rate
(> 450 kbps) transmissions in indoor channels generated by a measurement-based
channel model, SIRCIM, are compared with results in channels generated by the
classic two-ray Rayleigh fading model. Simulation results show that irreducible
BER is not only a function of rms delay spread, but is also a function of the
temporal and spatial distribution of multipath components. The simulation
results are also applied into a real-time bit-by-bit error simulation using a
hardware simulator between a data source and a data sink. Simulation results of
the transmission of a video image in mobile radio fading channels are shown. This
simulation methodology allows subjective evaluation of link quality between a
source and sink in a laboratory in real-time without the need of building radio
frequency hardware.
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