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Channel estimation method and apparatus

A channel estimation and channel response technology, applied in space transmit diversity, baseband system components, diversity/multi-antenna systems, etc., can solve problems such as poor demodulation performance and unsatisfactory channel estimation performance, and achieve improved performance and increased density , The effect of improving demodulation performance

Inactive Publication Date: 2009-04-22
HUAWEI TECH CO LTD
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Problems solved by technology

[0015] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art: In the channel estimation unit, only the pilot channel responses at the original pilot positions are used to obtain the channel responses at all time-frequency positions. The channel estimation performance of the channel estimation method is not ideal, so the demodulation performance of the whole system is poor

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  • Channel estimation method and apparatus
  • Channel estimation method and apparatus
  • Channel estimation method and apparatus

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Embodiment 1

[0043] Such as image 3 As shown, it is now assumed that the WiMAX system has two transmitting antennas, the pilot structure is comb-shaped, and is interleaved in the time domain and / or frequency domain, and there are three signals: Pilot (pilot signal), Zero (null signal) and User data (user data signal).

[0044] This embodiment provides a channel estimation device. Such as Figure 4 As shown, the channel estimation apparatus of this embodiment includes a receiving pilot signal obtaining unit, a reference pilot signal obtaining unit, a pilot channel estimating unit, an extension unit, and a channel estimating unit. Each unit of the channel estimation device will be described in detail below.

[0045] Received pilot signal obtaining unit, used to obtain the received pilot signal of the original pilot position from the received signal

[0046] A reference pilot signal obtaining unit, configured to obtain a reference pilot signal

[0047] The pilot channel estimation u...

Embodiment 2

[0058] This embodiment provides a channel estimation method, such as image 3 As shown, it is assumed that the WiMAX system still uses dual antennas, the pilot structure is comb-shaped, and the distribution of pilot symbols is interleaved in the time domain and / or frequency domain. Refer below Figure 7 Describe the channel estimation method of this embodiment, the method includes steps:

[0059] Step 71. Obtain the received pilot signal at the original pilot position from the received signal.

[0060] Step 72. Obtain a reference pilot signal.

[0061] Step 73. Estimate a first channel response according to the received pilot signal and the reference pilot signal.

[0062] Step 74, expand the first channel response to obtain the second channel response; after expanding the first channel response, the pilot frequency distribution is as follows: Figure 5 shown.

[0063] The first channel response may be extended in the time domain and / or in the frequency domain, and the ex...

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Abstract

The embodiment of the invention provides a channel estimation device and a method thereof. The channel estimation device comprises a receiving pilot signal gaining unit which is used for gaining the receiving pilot signal at the original pilot position from the received signals, a reference pilot signal gaining unit which is used for gaining reference pilot signals, a pilot channel estimation unit which is used for estimating a first channel response according to the receiving pilot signal and the reference pilot signal, an expanding element which is used for expanding the first channel response and gaining a second channel response, and a channel estimation unit which is used for carrying out the channel estimation by the second channel response and the first channel response. The device and the method carry out the channel estimation by the second channel response and the first channel response, increase the density of the initial channel estimation, and improve the performance of channel estimation, thus improving the demodulation performance of the whole system.

Description

technical field [0001] The present invention relates to a communication technology, in particular to a channel estimation method and device. Background technique [0002] Since the 1990s, multi-carrier technology has become a hot technology in broadband wireless communication. The most representative system applying this technology is the WiMAX (Worldwide Interoperability for Microwave Access) system using OFDM (Othogonal Frequency Division Multiplex, Orthogonal Frequency Division Multiplex) technology. In multi-carrier technology, a broadband carrier is divided into multiple sub-carriers, and data is transmitted on multiple sub-carriers simultaneously. In most system applications, since the width of the subcarrier is smaller than the coherent bandwidth of the channel, and the fading on each subcarrier on the frequency selective channel is flat fading, the intersymbol crosstalk is reduced and complex channel equalization is not required , suitable for high-speed data trans...

Claims

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Application Information

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IPC IPC(8): H04L25/02H04B7/08
Inventor 黄睿刘华斌
Owner HUAWEI TECH CO LTD
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