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Diversity channel estimate method for OFDM systems based on comb-type pilot frequency

A channel estimation and comb pilot technology, which is applied in the field of wireless mobile communication, can solve problems such as noise reduction, and achieve the effects of reducing complexity, increasing complexity, and good noise suppression characteristics

Inactive Publication Date: 2009-09-16
BEIJING JIAOTONG UNIV
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Problems solved by technology

[0008] In view of this, the main problem to be solved by the present invention is the problem of noise reduction in the channel estimation based on the transform domain of the comb pilot, and a diversity channel estimation method is adopted, which can reduce the noise very well

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  • Diversity channel estimate method for OFDM systems based on comb-type pilot frequency

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Embodiment Construction

[0027] The present invention will be described in more detail below in conjunction with the accompanying drawings and specific embodiments.

[0028] Firstly, a comb pilot OFDM system model is given here. After the binary information is interleaved, coded and mapped, the comb pilots are inserted into the frequency domain at equal intervals. The interval between two adjacent pilots is ΔP = N N p , where N is the number of subcarriers in one OFDM symbol, N p is the corresponding number of subcarriers. Virtual subcarriers and DC subcarriers are not considered here. In this way, the subcarriers and corresponding pilots carrying data in the frequency domain can be expressed as:

[0029]

[0030] Among them, X(k) is the signal carried by subcarriers in the frequency domain, including data information and pilot frequency, X D Corresponding data, X p Corresponding pilot. Th...

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Abstract

The invention discloses a diversity channel estimate method for OFDM systems based on comb-type pilot frequency, comprising the following steps: a. carrying out diversity on pilot frequencies and ensuring that the interval between adjacent pilot frequencies in each group is less than the coherence bandwidth of the channel; b. carrying out channel estimate on pilot frequencies in each group by traditional channel estimate methods and obtaining a plurality of channel estimate values of the group; c. combining the a plurality of channel estimate values of the group obtained in step b by the way of diversity combining and obtaining new combined channel estimate values. The method solves the problem of bigger error of the influence of noises on channel estimate in transform-domain channel estimate based on comb-type pilot frequency under the condition of prior information of unknown channels. According to the technical proposal of the invention, when the diversity number is L, the gain brought by the invention to MSE is 101g (1 / L)dB, thereby greatly improving the property of BER.

Description

technical field [0001] The present invention relates to the technical field of wireless mobile communication, in particular to an OFDM system channel estimation method in transform domain based on comb pilot. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology can transmit high-speed data streams on different subcarriers, and can resist frequency selective fading and narrowband interference. It is easy to combine with MIMO technology and has become the core of WLAN, WiMAX, and LTE. technology. [0003] However, since the transmission signal experiences a dual-selective fading channel, whether an accurate channel frequency response can be obtained at the receiver determines the performance of coherent demodulation in an OFDM communication system; especially after using MIMO technology to improve system capacity, accurate Channel frequency response determines the acquisition of MIMO diversity gain. [0004] In OFDM systems, comb pilots ...

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Application Information

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IPC IPC(8): H04L27/26H04B7/02
Inventor 刘留陶成邱佳慧戚小玉
Owner BEIJING JIAOTONG UNIV
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