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Complexity reduction and performance improvement of a decision feedback equalizer for 16QAM in land mobile communications

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3 Author(s)
Nagayasu, T. ; Commun. Syst. Dev. Lab., Mitsubishi Electr. Corp., Kamakura, Japan ; Sampei, S. ; Kamio, Y.

This paper proposes a complexity-reduced decision feedback equalizer (DFE) for 16-ary quadrature amplitude modulation (16QAM) using tap gain interpolation, bi-directional equalizing (BDE) and space diversity combining (SDC) to achieve high spectral efficiency and high quality data transmission over frequency-selective fading channels in land mobile communications. To reduce the amount of computation required for BDE and SDC, we propose a tap gain interpolation scheme and pre-decision schemes for both processes. Computer simulation of a (16QAM/TDMA system) confirms that the proposed scheme improves frequency-selective fading compensation performance by 6 dB or more while using only 27% of the computation of conventional single branch DFE receivers

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Vehicular Technology, IEEE Transactions on  (Volume:44 ,  Issue: 3 )