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OFDM system channel estimation and signal detection method based on basis expansion model

A base extension model and signal detection technology, applied to baseband system components, shaping networks in transmitters/receivers, etc.

Inactive Publication Date: 2013-12-11
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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Problems solved by technology

[0006] The purpose of the present invention is to solve the existing problems of using the base extension model to estimate the fast-changing channel technology when it is applied to the OFDM system with missing cyclic prefix. System Channel Estimation and Signal Detection Method

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  • OFDM system channel estimation and signal detection method based on basis expansion model
  • OFDM system channel estimation and signal detection method based on basis expansion model
  • OFDM system channel estimation and signal detection method based on basis expansion model

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Embodiment Construction

[0047] Channel estimation and signal detection methods for OFDM systems based on the base extension model, such as image 3 , 4 shown, including the following steps:

[0048] Step 1: Let X i , denoted as where N represents the length of the OFDM symbol, and the frequency-domain OFDM symbol X i Some of the subcarriers with determined positions are assigned pilots, and the others are data subcarriers; then the corresponding time-domain OFDM symbols currently sent by the sender x i can be recorded as and x i =F H x i , where F H Represents the IFFT transformation matrix of N points, and i represents the ith OFDM symbol, that is, the index number of the OFDM symbol.

[0049] Step 2: Assume the time-domain OFDM symbol x i After double-selection channels superimposed by fast time-varying and multipath effects, the time-domain OFDM symbols received by the receiver are After the time-domain OFDM symbols at the transmitting end pass through dual channel selection, the time...

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Abstract

The invention discloses an OFDM system channel estimation and signal detection method based on a basis expansion model, and belongs to the technical field of wireless and mobile communication. The OFDM system channel estimation and signal detection method specifically comprises the following steps of OFDM signal sending through a sending end, receiving end channel modeling, initialization, estimation of a basis expansion model coefficient, channel equalization and signal detection, iteration and output. In the receiving end channel modeling step, a receiving end frequency domain signal is subjected to interference and separation of useful information; on the assumption that the initialization step is not restricted by a cyclic prefix, the basis expansion model coefficient is estimated, and data symbols which are sent currently are obtained through detection; inter-symbol interference frequency response and the frequency response of a reconstituted part of a cyclic prefix are obtained in the iteration step, and therefore influence caused by inter-symbol interference is removed. By means of the estimation method, on one hand, channels with obvious time-varying characteristics can be estimated; on the other hand, the inter-symbol interference caused by multi-path time delay can be eliminated effectively, channel estimation and signal detection of an OFDM system in a double-selection channel are completed, and system performance is improved.

Description

technical field [0001] The invention belongs to the technical field of wireless and mobile communication, and specifically relates to an OFDM system joint channel estimation and signal detection algorithm based on the lack of cyclic prefix of the base extension model under the double-selection channel. From the perspective of the frequency domain, the inter-symbol interference elimination and the iteration are carried out. The reconstruction of the cyclic prefix largely overcomes the influence of inter-symbol interference caused by the absence of the cyclic prefix, and then achieves ideal channel estimation and signal detection performance. Background technique [0002] In the ground ultra-high-speed mobile environment, the inter-carrier interference (ICI) caused by the fast time-varying channel and the inter-symbol interference (ISI) caused by the multipath effect will destroy the transmission characteristics of the OFDM system. Causes rapid deterioration of system performa...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03
Inventor 雷霞曹海波宋阳罗阳陈晓
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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