A transmission method of pilot signal in multi-carrier system

Abstract

The invention discloses a method for transmitting a pilot signal of a multi-carrier system, which belongs to the field of multi-carrier communication and comprises the following steps of: transmittinga pilot sequence of a frame header and a data symbol in a frame by adopting a filter bank multi-carrier OQAM / FBMC based on offset quadrature amplitude modulation; calculating an initial channel frequency response estimated value according to the noise correlation on different subcarriers in the pilot frequency sequence; carrying out orthogonal transformation on the initial channel frequency response estimation value, and setting a noise signal at a non-tap position of a channel to be zero; obtaining a tap position noise component according to the correlation of the noise in the transform domain and the noise signal of the non-tap position; and filtering the noise signal at the tap position, and converting the initial channel frequency response estimated value subjected to noise elimination back to the frequency domain to obtain a final channel estimated value. According to the method, the noise correlation in the transform domain is utilized to effectively estimate and eliminate the noise signal at the channel tap position, and the problem of poor channel estimation performance of the OQAM / FBMC system is solved.

Description

technical field [0001] The invention belongs to the field of multi-carrier communication, and more specifically relates to a method for transmitting pilot signals of a multi-carrier system. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM), as the most commonly used multi-carrier transmission method in broadband wired and wireless channels, has occupied a dominant position in the past. OFDM has been widely used in DSL and most wireless standards, such as IEEE802.11 and variants of IEEE 802.16, 3GPP-LTE and LTE-Advanced. OFDM is considered perfect for point-to-point communication. However, when considering the adoption of OFDM in more complex networks, it has to face many challenges. On the one hand, OFDM technology needs to use cyclic prefixes to combat multipath fading, resulting in a waste of spectrum resources; on the other hand, OFDM technology has high requirements for synchronization, parameters cannot be flexibly configured, and it is d...

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Problems solved by technology

[0005] For the defects of the prior art, the purpose of the present invention is to provide a transmission method of a multi-carrier system pilot signal, aiming at solving the problem that the OQAM / FBMC system does not eliminate the noise in the channel tap when the transform domain is processed, which causes its The problem of low channel estimation performance

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