Abstract
This paper describes the methodology and the results of performance investigations on a multiple-input multiple-output (MIMO) transceiver scheme for frequency-selective radio channels. The method relies on offline simulations and employs real-time MIMO channel sounder measurement data to ensure a realistic channel modeling. Thus it can be classified in between the performance evaluation using some predefined channel models and the evaluation of a prototype hardware in field experiments. New aspects for the simulation setup are discussed, which are frequently ignored when using simpler model-based evaluations. Example simulations are provided for an iterative ("turbo") MIMO equalizer concept. The dependency of the achievable bit error rate performance on the propagation characteristics and on the variation in some system design parameters is shown, whereas the antenna constellation is of particular concern for MIMO systems. Although in many of the considered constellations turbo MIMO equalization appears feasible in real field scenarios, there exist cases with poor performance as well, indicating that in practical applications link adaptation of the transmitter and receiver processing to the environment is necessary.
Highlights
multiple-input multiple-output (MIMO) transmission schemes are attractive candidates for the new air interfaces of wireless networks beyond 3G
A key question for a system implementation is, do we find practically feasible schemes that are sufficiently robust for this task? Or somewhat related, what specific features are required for a practical MIMO system to work reliably under a wealth of various propagation conditions?
For a successful MIMO system development, more efforts than ever before have to be spent on the channel modeling side, because the multipath propagation itself turns into a key component of the transmission system
Summary
MIMO transmission schemes are attractive candidates for the new air interfaces of wireless networks beyond 3G. Evaluating the performance of a wideband MIMO detection scheme by means of simulations requires much more detailed knowledge and exactness of the channel than conventional single-antenna systems or systems with multiple antennas only at one side of the link. This makes high demands on an appropriate MIMO channel model, which is currently a hot topic in the research. For this reason, a good practice is the validation of new models in terms of the performance results of system simulations.
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