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Method of synchronization and receiving end apparatus

A receiving end and receiving antenna technology, applied in the direction of space transmit diversity, electrical components, orthogonal multiplexing systems, etc.

Active Publication Date: 2012-02-01
TD TECH COMM TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The diversity combination performed in the maximum ratio combination method does not fully utilize the advantages of multiple antennas, so that the synchronization accuracy of the MIMO-OFDM system does not reach the optimal performance

Method used

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  • Method of synchronization and receiving end apparatus
  • Method of synchronization and receiving end apparatus
  • Method of synchronization and receiving end apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0071] See figure 2 In step 201, the send terminal transforms the synchronous sequence and send it to the receiving end.

[0072] This step is the initial operation of the MIMO-OFDM system, and the purpose of sending the IFFT transformation of the synchronous sequence saved by itself is to convert the synchronous sequence from the frequency domain signal to the time domain signal.Assuming the length of the synchronous sequence in this embodiment is n / 2, then the synchronous sequence can be expressed as: C = {c (k), k = 0, 1, ..., n / 2-1}, and being carried carryingOn the occasional carrier of OFDM symbol.After the IFFT transformation, the synchronous sequence can be expressed as:

[0073] c ( m ) = 2 N Σ k = 0 N / 2 ...

Embodiment 2

[0119] In step 301 ~ 302, after sending the synchronous sequence to fast Fourier Revelation (IFFT), send it to the receiving terminal; after receiving the signal from multiple receiving antennas through multiple receiving antennas, calculate all on each receiving antenna all on each receiving antenna.The autocorrelation characteristics and energy statistics corresponding to the receiving signal of the diameter, and determine the starting position of the frame of each receiving antenna.

[0120] In step 303 to 304, the receiving antenna with the largest self -related characteristic value is used as a frequency bias to select antenna, frequent bias estimates of the antenna, and use the frequency bias values obtained.; Calculate the absolute autocorrelation value of the receiving signal and the time domain synchronization sequence saved at the receiving terminal, and determine that each receiving antenna is determined at the time of the initial estimation value and the location of th...

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Abstract

The invention discloses a synchronization method which comprises the following steps: A. a receiving end receives a synchronous sequence processed by IFFT transformation from a transmitting end through a plurality of receiving antennas as a received signal. B. the receiving end determines the frame starting positions of all the receiving antennas, calculates the estimated value of frequency deviation and compensates the frequency deviation of all the antennas. C. the receiving antenna with premium response performance is selected as a fine timing selected antenna according to the results of the antennas after being compensated for frequency deviation, and the starting position information of the FFT windows of all the receiving antennas is determined according to the absolute self-correlation peak value of a signal received by the fine timing selected antenna. The invention also discloses a receiving end device for synchronization, and the device comprises a plurality of receiving antennas, a rough synchronization module, a frequency deviation estimation and compensation module, and a fine timing module. The technical proposal of the invention can improve the synchronization precision effectively.

Description

Technical field [0001] The invention involves multiple input multiple outputs (MIMO input and Multiple Output) technology, especially system synchronization methods and receiving end equipment based on MIMO and orthogonal FrequencyDivision Multiplexing. Background technique [0002] OFDM technology is a multi -carrier transmission technology that divides the channel into several orthogonal sub -channels, converts high -speed data into parallel low -speed data streams, and modulates it to each sub -channel for transmission.The signal on the OFDM system in the orthogonal sub-channel can be discre and disconnected by the receiving end, which can reduce the mutual interference between the sub-channels (ICI, Inter-Carrier Interference), and use the spectrum resources efficiently.Because the total bandwidth is divided into several narrow -band subcarculium, when the bandwidth of each sub -channel is smaller than the related bandwidth of the channel, each sub -channel can be regarded as...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04J11/00H04B7/04
Inventor 张建华刘光毅赵浩冯冲张平
Owner TD TECH COMM TECH LTD