Channel estimation method for comb-shaped pilot frequency OFDM system

Abstract

The invention discloses a channel estimation method for a comb-shaped pilot frequency OFDM system. The channel estimation method comprises the following steps: presetting an iterative loop time threshold; adopting long and short preambles to carry out OFDM synchronization on a receiving signal, and presetting an initial loop time counting value; extracting each data symbol behind the synchronization position of the receiving signal; estimating the coefficient of a basis expansion model by use of the pilot frequency in each data symbol, and then calculating a channel estimated value of the data symbol corresponding to the time domain; if the loop time counting value is smaller than the preset iterative loop time threshold, executing channel encoding, interweaving and modulation on an obtained sending signal to serve the same as a new receiving signal, and returning to repeat the channel estimation operation; otherwise, in the case of non algorithm convergence before and after iterative loop, adjusting the synchronization position, presetting an initial loop time value, and executing the channel estimation operation again; and otherwise, completing the channel estimation operation, and outputting the decoded sending signal. The channel estimation method disclosed by the invention can be used for improving the accuracy of channel estimation of a high-speed mobile wireless channel.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method for channel estimation of a comb pilot OFDM system in a high-speed mobile channel environment. Background technique [0002] With the development of wireless communication technology, people have put forward higher requirements for the accuracy of received signals. However, after the transmitted signal is transmitted through the wireless channel, it usually has fading and distortion. In order for the receiving end to receive and detect the correct transmission Signal, it is necessary to understand the relevant parameters of the channel and take measures to compensate for channel fading. Channel estimation is a technology to improve the quality of wireless communication in this case. [0003] The IEEE802.11p protocol evolved on the basis of the IEEE802.11a protocol. Therefore, the channel estimation method of the wireless LAN Orthogonal Frequency Division Multiplex...

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the problem that the above-mentioned channel estimation method cannot be applied in a high-speed mobile environment, the present invention provides a channel estimation method for a comb pilot OFDM system, so that better channel estimation can also be provided in a high-speed mobile environment

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