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n this paper, it is proposed a new unique word (UW) OFDM waveform based on zero-tail discrete Sine transform spread OFDM (ZT UW DST-S OFDM). The proposed waveform improves the ZT DST-S-OFDM and UW OFDM methods by removing the influence of the data symbols on the tail of the transmitted signal. In this study, the effects of different UW sequences such as Zadoff-Chu, CAZAC, 15 bit PN, 8 bit complementary code keying (CCK), 0-word, 1-word and -1-word on the bit error rate (BER) and channel tracking (Doppler) performance of the proposed ZT UW DST-S OFDM systems are investigated. In order to test t ...Daha fazlası
In this paper, zero-tail discrete cosine transform spread OFDM (ZT DCT-S OFDM) waveform is proposed as an alternative to 5th generation (5G) waveform enhancement studies. In order to verify the performance of the proposed method and compare with the conventional OFDM and zero-tail discrete Fourier transform spread OFDM (ZT DFT-S OFDM) systems, computer simulations are performed on time invariant and time variant frequency selective Rayleigh fading channels. The obtained simulation results show that the proposed ZT DCTS OFDM method has better bit error rate (BER) and channel tracking (carrier f ...Daha fazlası
A novel single carrier frequency domain channel equalizer (SC-FDE) based on discrete wavelet transform (SCDWT-FDE) has been proposed to improve the performance of conventional SC-FDE in this paper. Computer simulations have been performed to verify the performance of the proposed method in stationary and non-stationary frequency selective Rayleigh fading channels. The obtained simulation results using SC-FDE physical layer specifications have demonstrated that the proposed SC-DWT-FDE method has considerably better performance and carrier frequency offset (CFO) tracking than conventional SC-FDE ...Daha fazlası
A novel zero tail OFDM (ZT OFDM) method based on Walsh Hadamard transform (ZT WHT OFDM) has been proposed to improve the performance of ZT OFDM systems, from 5G candidate waveforms in this paper. Computer simulations have been performed to show the performance of the proposed method in stationary and non-stationary frequency selective Rayleigh fading channels. The obtained simulation results using HIPERLAN/2 physical layer specifications have demonstrated that the proposed ZT WHT OFDM method has considerably better performance and Doppler shift tracking than conventional OFDM and ZT OFDM.
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