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Eight-antenna channel estimation method for OFDM demodulating end

A channel estimation and antenna technology, applied in diversity/multi-antenna systems, space transmit diversity, baseband system components, etc., can solve the problem of reducing the quality of channel estimation

Inactive Publication Date: 2010-03-10
SHANGHAI JIAO TONG UNIV
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, a total of 32 reference signals are required, which exceeds the specified limit of 24 reference signals; at the same time, there are 4 antennas, and there are only 2 reference signals in each subframe, which reduces the quality of channel estimation

Method used

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  • Eight-antenna channel estimation method for OFDM demodulating end
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  • Eight-antenna channel estimation method for OFDM demodulating end

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Embodiment Construction

[0029] The embodiments of the present invention are described in detail below. This embodiment is implemented on the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are provided, but the protection scope of the present invention is not limited to the following implementation example.

[0030] Such as figure 1 As shown, the application environment of this embodiment is as follows: the whole process is determined by reference signal position, each antenna reference signal allocation, data mapping, precoding and signal transmission, receiving terminal frame shaping, reference signal position channel estimation, virtual reference signal position channel estimation And other position channel estimation consists of 8 parts.

[0031] (1) The base station determines the position of the reference signal

[0032] There are a total of 8 antennas at the base station, each antenna corresponds to a subframe,...

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Abstract

The invention relates to an eight-antenna channel estimation method for an OFDM demodulating end in the technical field of wireless transmission, which comprises the following steps: a base station terminal determines the positions of 24 reference signals in every subframe and equally distributes the positions of the 24 reference signals into eight transmitting antennas; the base station inserts data marks into the rest position of the subframe corresponding to each transmitting antenna; after the data marks are precoded, sending signals are transmitted to a mobile terminal by the eight transmitting antennas; the mobile terminal receives the signals and reestablish the subframed, and then obtains channel fading coefficients of each transmitting antenna according to the positions of the reference signals, and finally obtains fading coefficients of the positions of virtual reference signals; and the mobile terminal obtains the fading coefficients of the corresponding channels of the eight transmitting antennas at other positions according to the linear interpolation, thus obtaining the optimized channel estimation value.

Description

technical field [0001] The present invention relates to a method in the technical field of wireless transmission, in particular to an 8-antenna channel estimation method used at an OFDM demodulation end. Background technique [0002] In an OFDM system, in order to adapt to channel characteristics, the baseband signals of each carrier are modulated at the transmitting end. Correspondingly, on the side of the mobile terminal, demodulation must be performed in order to recover the baseband signal from the modulated signal. For multi-ary systems with high transmission rates, coherent demodulation is usually used, which requires that the carrier frequencies at the receiving and sending ends must be the same frequency and phase to ensure the correctness of signal demodulation. Therefore, channel estimation must be performed in communication systems. In the 3GPP TS36.211V8.5.0 (2008.12) system, a channel estimation method based on reference signals is adopted: that is, in each su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L27/26H04B7/06
Inventor 徐朝凯吴幼龙张宇罗汉文俞晖
Owner SHANGHAI JIAO TONG UNIV
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