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A MIMO-OFDM system based channel estimation method

A channel estimation and channel technology, applied in baseband system components, multi-frequency code systems, etc., can solve the problem of not being able to identify multiple channel fading coefficients, and achieve the effect of avoiding mutual interference

Inactive Publication Date: 2005-11-30
上海贝豪通讯电子有限公司
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AI Technical Summary

Benefits of technology

This invention provides an improved method for improving communication by reducing signal interruptions caused when multiple radios transmit data simultaneously over different frequencies or channels. By doing this, it becomes possible to improve overall performance without compromising reliability due to increased redundancy provided through time division techniques such as code division multiple access (CDMA).

Problems solved by technology

This patented technical problem addressed in this patents relates to improving the accuracy and effectiveness of radiocommunication devices that use Orthogonal Fused Carbon Therapeutics (OFC)-CDMA technologies such as Long Term Evolution/Long Time Interchange Multiple Access Communicators (LTE)/Time Code DivisionMultiple Access Systems (TDMA)). These techniques require accurate timing measurements prior to decoding signals in order to improve their overall quality or reduce errors caused by multipath propagating environments like indoor localization networks. Current methods are either too complicated or have poor results due to insensitive characteristics of these types of media.

Method used

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  • A MIMO-OFDM system based channel estimation method
  • A MIMO-OFDM system based channel estimation method
  • A MIMO-OFDM system based channel estimation method

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Embodiment Construction

[0044] In the MIMO-OFDM system with multiple transmitting and receiving antennas, the present invention adopts a simple and effective training sequence design scheme, including a pre-pilot structure and a comb-shaped pilot structure, so that the positions of the pilots on each antenna are staggered. In order to remove the mutual interference between each antenna pilot during channel estimation, the pre-pilot structure scheme is suitable for slow fading channels, and the comb pilot structure scheme is suitable for fast fading channels. Then a new MIMO-OFDM channel estimation algorithm based on the maximum likelihood (ML) method is proposed, and the algorithm is applied to these two pilot structures.

[0045] The specific plan is as follows:

[0046] (1) System model

[0047] A MIMO-OFDM system with nT transmitting antennas and one receiving antenna such as figure 1 Shown. It is assumed that the carriers are synchronized, and the Doppler frequency shift is not considered. In the nt...

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Abstract

This invention provides one simple and effective training sequence design scheme in the MIMO-OFDM system with several antenna, which comprises front frequency structure and comb frequency structure to make each antenna frequency position crossed to remove the interference between each antenna, wherein, the front frequency structure scheme is suitable for slow declining channel and the comb frequency finding structure scheme is suitable form rapid declining channel. The invention also provides one MIMO-OFDM channel computation method based on the ML method to apply the method into the above two structures.

Description

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Claims

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Application Information

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Owner 上海贝豪通讯电子有限公司
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