Increasing of the qam symbols reconstruction accuracy when applying the filtered orthogonal frequency division multiplexing method

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Abstract

The filtered orthogonal frequency division multiplexing method used for the transmission of the signals with spectra in adjacent frequency subbands has been analyzed. Three types of errors appearing when applying the method for quadrature amplitude modulation symbols transmission have been described. For the error reduction the modified algorithm based on cyclic convolution properties has been developed. In the numerical experiment, the classical and modified algorithms have been applied in combination with modulation schemes of large order.

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About the authors

K. A. Budunova

Kotel’nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences

Author for correspondence.
Email: 1917schw@mail.ru
Russian Federation, Mokhovaya Str., 11, Build. 7, Moscow, 125009

V. F. Kravchenko

Kotel’nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences; Bauman State Technical University; Scientific and Technological Center of Unique Instrumentation, Russian Academy of Sciences

Email: kvf-ok@mail.ru
Russian Federation, Mokhovaya Str., 11, Build. 7, Moscow, 125009; 2nd Baumanskaya Str., 5,Build. 1, Moscow, 105005; Butlerova Str., 15, Moscow, 117342

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2. Fig. 1. Block diagram of the OFDM method with filtering.

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3. Fig. 2. Sequences and (light and dark curves, respectively) obtained by filtering two adjacent OFDM symbols and with a cyclic prefix; the delay from signal filtering falls within the DFT signal sampling region, the boundaries of which are shown by dotted lines.

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4. Fig. 3. Amplitude-frequency characteristics: a) |F1 (exp (jω))| (light curve), |Y2 (exp (jω))| (dark) of the filter and signal (dotted line — passband limits |F1 (exp (jω))|); b) |W (exp (jω))| (light curve), (dark) sequences (15) and (16).

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5. Fig. 4. Dependences of BER on the Eb / N0 ratio for modulation schemes QAM 256 (a), QAM 1024 (b), QAM 4096 (c), obtained using the standard (dashed curve) and modified (solid) OFDM algorithms with filtering.

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