Abstract
In recent times, there has been growing interests in integration of voice, data and video traffic in wireless communication networks. With these growing interests, WCDMA has immerged as an attractive access technique. The performance of WCDMA system is deteriorated in presence of multipath fading environment. The paper presents space-time coded minimum mean square error (MMSE) Decision Feedback Equalizer (DFE) for wideband code division multiple access (WCDMA) in a frequency selective channel. The filter coefficients in MMSE DFE are optimized to suppress noise, intersymbol interference (ISI), and multiple access interference (MAI) with reasonable system complexity. For the above structure, we have presented the estimation of BER for a MMSE DFE using computer simulation experiments. The simulation includes the effects of additive white Gaussian noise, multipath fading and multiple access interference (MAI). Furthermore, the performance is compared with standard linear equalizer (LE) and RAKE receiver. Numerical and simulation results show that the MMSE DFE exhibits significant performance improvement over the standard linear equalizer (LE) and RAKE receiver.
Highlights
During the period of last one decade, the large demands for wireless services and high data speeds have driven the wireless cellular networks to a tremendous growth
We have presented the estimation of bit error rate (BER) for a minimum mean square error (MMSE) decision feedback equalizer (DFE) using computer simulation experiments
We have assumed 3-paths channels and the number of feed-forward taps, Lf for two-dimensional DFE has been taken equal to 5. It can be observed as the number of users increases, MMSE DFE offers better performance than Rake receiver, adaptive linear equalizer (LE)
Summary
During the period of last one decade, the large demands for wireless services and high data speeds have driven the wireless cellular networks to a tremendous growth. In third generation WCDMA systems, the processing transmit gain may be very small This makes the use of diversity quite effective. The performance of the receiver with a chip-level linear equalizer (LE) is not significantly better than the rake receiver, unless the receiver of the mobile station is equipped with multiple receiving antennas or uses over sampling. Multiple receive antennas or a higher sampling rate can be used for the chip level minimum mean square error linear equalizer (MMSE-LE) [10]. We investigate and analyze a minimum mean-square error (MMSE) decision feedback equalizer (DFE) for spacetime coded WCDMA downlink channel to achieve better performance than the chip level LE and a RAKE receiver in a frequency selective channel.
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