EFFICIENT SIMULATION OF MULTICARRIER DIGITAL-COMMUNICATION SYSTEMS INNONLINEAR CHANNEL ENVIRONMENTS

The effectiveness of computer simulation as a tool for the design and analysis of communication systems is often limited by the long executi on times required for many simulations. When simulating multicarrier d igital communication systems operating over nonlinear channels, the re quired high sampling rate contributes significantly to long execution times. A new method that reduces the sampling rate of simulations of s uch systems is developed. This Partial Sum of Products (ParSOP) method reduces the sampling rate by generating only the intermodulation prod ucts that lie in a frequency band of interest. The ParSOP method requi res that the bandpass nonlinearity be represented by memoryless operat ions on the complex envelope of the signal and that the subcarriers co nstituting the frequency-division multiplexed signal are sufficiently separated to prevent significant adjacent channel interference. Simula tion results for such systems show that an order of magnitude reductio n in the sampling rate is possible while producing only minimal error in the bit error rate estimate.