A decision-feedback equalizer with tentative chip feedback for the downlink of wideband CDMA

We investigate a chip-level minimum mean-square-error (MMSE) decision-feedback equalizer (DFE) for the downlink receiver of wideband code-division multiple-access (CDMA) systems using long scrambling code over frequency-selective channels. The DFE uses the tentative decision of the current symbol as...

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Bibliographic Details
Main Authors: Jingnong Yang, Li, Y.
Format: Conference Proceeding
Language:English
Subjects:
Decision feedback equalizers
Downlink
Fading
Feeds
Frequency
Multiaccess communication
Multiple access interference
Nonlinear filters
Performance gain
Wideband
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Summary:We investigate a chip-level minimum mean-square-error (MMSE) decision-feedback equalizer (DFE) for the downlink receiver of wideband code-division multiple-access (CDMA) systems using long scrambling code over frequency-selective channels. The DFE uses the tentative decision of the current symbol as feedback. The proposed DFE performs better than the chip-level linear equalizers (LE) and the DFE that feeds back only the symbols already decided. The performance gain increases with signal-to-noise ratio (SNR), but decreases with the number of active users. The performance of these different equalizers is compared through simulation of symbol-level MSE over a fixed channel.
DOI:10.1109/ICC.2002.996829