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Improving BER performance of uplink LTE by using turbo equalizer

Keywords:

A.L. Gelgor – Ph. D. (Eng.), Associate Professor, Department «Radioelectronic Means of Information Protection», Peter The Great St.Petersburg Polytechnic University. E-mail: a_gelgor@mail A.I. Gorlov – Assistant, Department «Radioelectronic Means of Information Protection», Peter The Great St.Petersburg Polytechnic University. E-mail: anton.gorlov@yandex.ru P.V. Ivanov – Ph. D. (Eng.), д. по НИР, CJSC «New Wireless Technology» (Moscow). E-mail: ivanov@sbtcom.ru! E.A. Popov – Ph. D. (Eng.), Associate Professor, Department «Radioelectronic Means of Information Protection», Peter The Great St.Petersburg Polytechnic University. E-mail: eugapop@gmail.com A.V. Arkhipkin – Ph. D. (Eng.), General Product Engineer, CJSC «New Wireless Technology» (Moscow). E-mail: ava@sbtcom.ru T.E. Gelgor – Assistant, Department «Radioelectronic Means of Information Protection», Peter The Great St.Petersburg Polytechnic University. E-mail: tanya.gelgor@yandex.ru


The potential of turbo-equalization technique applied to uplink (UL) LTE signals detection is analyzed in this paper. The turbo equalizer, which is also called iterative receiver, represents a popular approach for detection of signals passed through a fading channel. The receiver performs equalization and decoding of error-correcting code in a loop. For implementation of the iterative receiver we per-formed two frequency-domain equalizers: approximate MMSE SISO-equalizer and soft interference canceller (SIC) SISO-equalizer. During simulation we analyzed several configurations of UL LTE with QPSK, 16 QAM, 64 QAM signal constellations and allocation of 25 and 100 resource blocks. All considered modes used rate 2/3 parallel concatenated convolutional code and single input single output antennas pattern. Bit error rate (BER) performance was estimated during the simulation with extended vehicular A (EVA) model of multipath fading channel.
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