Novel estimation method for orthogonal frequency-division multiplexing receiving channel combining time domain and frequency domain

A technology of time-domain channel estimation and orthogonal frequency division, which is applied in the field of channel estimation and new joint time-domain and frequency-domain OFDM receiving channel estimation, which can solve the sensitivity to frequency selective fading and reduce the amount of information, etc. problem, achieve the effect of reducing calculation time, reducing calculation complexity, and strong application adaptability

Active Publication Date: 2014-06-18
JIANGSU ZHENGHETONG INFORMATION TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is sensitive to frequency selective fading. In order to accurately estimate the fast fading channel, too many pilot points will reduce the amount of information sent.

Method used

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  • Novel estimation method for orthogonal frequency-division multiplexing receiving channel combining time domain and frequency domain
  • Novel estimation method for orthogonal frequency-division multiplexing receiving channel combining time domain and frequency domain
  • Novel estimation method for orthogonal frequency-division multiplexing receiving channel combining time domain and frequency domain

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A new joint time-domain and frequency-domain OFDM receiving channel estimation method, including frame structure design at the sending end, time-domain channel estimation and equalization using preamble training sequences at the receiving end, and frequency-domain channel estimation using comb pilots Estimate equalization and correct residual frequency offset in three functional steps.

[0026] 1) Design of frame structure:

[0027] Each send frame structure is as figure 1 , Point data symbols are obtained after channel coding, subcarrier mapping, modulation and channel interleaving are performed on the data at the transmitting end, and are periodically inserted before each transmitted data symbol according to the 802.11p standard Point preamble m=[1 1 1 1 -1 -1 -1 1 -1 -1 1 1 -1 1 -1 0], used for time-domain channel estimation, sending data symbols -21, 7 at 64 points , 7, and 21 total 4 subcarriers are inserted with pilot information for frequency domain channel e...

Embodiment 2

[0047] Example 2: As a preferred solution of the present invention, the channel estimation and equalization can be realized by selecting hardware chips, such as Field Programmable Gate Array (FPGA) and Digital Signal Processing Chip (DSP).

Embodiment 3

[0048] Example 3: As another preferred solution of the present invention, the channel estimation and equalization can be implemented based on computer software.

[0049] The present invention can also combine the technical solutions described in embodiments 2 and 3 with the embodiments to form new technical solutions.

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Abstract

The invention relates to a novel estimation method for an orthogonal frequency-division multiplexing receiving channel combining a time domain and a frequency domain. The method comprises the following steps that (1) frame structural design is carried out on a sending end, wherein leader characters for channel estimation and pilot frequency insertion are set at the sending end; (2) time domain channel estimation balancing is carried out at a receiving end, wherein the time domain channel estimation balancing is carried out by using the leader characters; (3) frequency domain channel estimation balancing is carried out, and residual frequency offset is corrected, wherein the frequency domain channel estimation balancing is carried out by using pilot frequency information. Through the method, sent information amount is improved, influences of noise can be restricted better, and performance of a system is improved; when the frequency domain channel estimation balancing is carried out by using pilot frequencies, division channel balancing is achieved by using multiplication channel balancing, resources are saved, and calculating time is reduced when hardware is achieved; the channel estimation balancing can be achieved correctly under a low SNR and multiple channels, and the novel estimation method for the orthogonal frequency-division multiplexing receiving channel combining the time domain and the frequency domain has strong application adaptability.

Description

technical field [0001] The invention relates to a channel estimation method, in particular to a new joint time domain and frequency domain orthogonal frequency division multiplexing receiving channel estimation method, which belongs to the technical field of wireless communication. [0002] Background technique [0003] Orthogonal Frequency Division Multiplexing, formerly known as Orthogonal Frequency Division Multiplexing in English, abbreviated as OFDM, is actually a type of MCM Multi-CarrierModulation multi-carrier modulation. The main principle is to divide the channel into several orthogonal sub-channels and convert high-speed data signals into parallel low-speed sub-data streams, modulated to be transmitted on each sub-channel. Orthogonal signals can be separated by using correlation techniques at the receiver, which can reduce the mutual interference ICI between sub-channels. The signal bandwidth on each sub-channel is smaller than the relevant bandwidth of the chan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/02H04L25/03H04L27/26
Inventor 戴佳高晓兵丁晓进陈晓曙朱正东
Owner JIANGSU ZHENGHETONG INFORMATION TECH CO LTD
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