1. Optimum Windowing for Multicarrier CDMA Systems with MMSE Receivers
- Author
-
James S. Lehnert and Shun-Te Tseng
- Subjects
Optimization problem ,Asynchronous communication ,Computer science ,Orthogonal frequency-division multiplexing ,Matched filter ,Frequency domain ,Electronic engineering ,Window (computing) ,Time domain ,Computer Science::Information Theory - Abstract
The windows for achieving good multiple-access performance of multicarrier code-division multiple-access (MC-CDMA) systems employing minimum mean-squared error (MMSE) receivers are studied. The optimization objective, mean-squared error (MSE) minimization, is examined in the time domain. In a simplified two-user system, the optimization problem is shown to be equivalent to the problem of selecting the chip waveform in an asynchronous DS-CDMA system employing a matched filter. The rectangular window is shown to be optimum, while regarded as an inferior window in OFDM systems due to high spectral sidelobes and slow spectral rolloff.
- Published
- 2007
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