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Channel estimation of GFDM system based on pilot frequency in doubly selective channel

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Abstract

As the speed of the communication system increases, there exist two kinds of fading simultaneously in the wireless channels, namely time-frequency double-selective fading. In this case, delay expansion and doppler shift will affect the channel, resulting in inter-carrier interference and inter-symbol crosstalk, which will affect the channel estimation performance of generalized frequency division multiplexing communication technology. This paper first analyzes the effects of time-selective fading and frequency-selective fading on transmitted signals. Then, a complex exponential basis extension model (CE-BEM) suitable for dual selective channels was selected, and the mean square error (MSE) was used to evaluate the CE-BEM model. The function order Q of GFDM channel estimation simulation was determined by the relationship between the number of sampling points in the transmission block and different order functions. Finally, the least square (LS) channel estimation algorithm and the least mean square error (MMSE) are used to complete the channel estimation of the GFDM communication system. The performance of channel estimation is improved by changing the way of pilot insertion, and the performance of channel estimation is measured by mean square error (MSE) when the characteristics of pilot insertion are changed.

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Funding

Funding was provided by National Natural Science Foundation of China (Grant Number 62071167).

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Correspondence to Chungang Liu.

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Tian, X., Liu, C., Gu, Y. et al. Channel estimation of GFDM system based on pilot frequency in doubly selective channel. Wireless Netw 30, 5049–5057 (2024). https://doi.org/10.1007/s11276-022-03216-1

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