Soft output decision feedback equalizer using variable step-size algorithm for turbo coded DS/CDMA systems

Udomsripaiboon, T.; Mingkwan, C.; Benjangkaprasert, C.; Sangaroon, O.; Janchitrapongvej, K.

doi:10.1109/ispacs.2005.1595457

Cited by 3 publications

(1 citation statement)

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“…Thus, the MAI cannot be completely removed by the correlator or despreder. To avoid this, multiple receive antennas or a higher sampling rate can be used for the chip level minimum mean square error linear equalizer (MMSE-LE) [10]. Decision feedback equalization is a powerful equalization technique that provides postcursor ISI cancellation with reduced noise enhancement and is widely used to offer better steadystate performance than a linear equalizer (LE).…”

Section: Introductionmentioning

confidence: 99%

BER Performance of Space-Time Coded MMSE DFE for Wideband Code Division Multiple Access (WCDMA)

Sharma¹,

Ahmad²

2009

IJCNS

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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

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Section: Introductionmentioning

confidence: 99%