Carrier synchronization method in UFMC system

A carrier synchronization and carrier technology, applied in the direction of multi-frequency code system, etc., can solve the problems of low out-of-band leakage, high robustness, not strict time-frequency calibration, etc.

Active Publication Date: 2016-10-26
CHONGQING UNIV OF POSTS & TELECOMM
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Problems solved by technology

It has the following characteristics: a) supports segmented spectrum communication; b) has lower out-of-band leakage compared with OFDM; c) has higher robustness to time-frequency offset and inter-carrier interfere

Method used

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  • Carrier synchronization method in UFMC system
  • Carrier synchronization method in UFMC system
  • Carrier synchronization method in UFMC system

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Embodiment Construction

[0044] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0045] Figure 5 Be the schematic flow chart of the carrier synchronization method in the UFMC system of the present invention, as shown in the figure, this method comprises the following steps:

[0046] S1: Generate an nB×nB Hadamard matrix M P , select the matrix M P Any two rows or columns of P n ,P m , and insert it into the UFMC signal as a pilot sequence, and satisfy nBmod(4)=0, P n ×P m * = 0;

[0047] S2: Evenly divide the N subcarriers into B groups (that is, B subbands), then each subband contains subcarriers; assuming that n subcarriers are selected in each subband to transmit pilot signals, and the remaining D-n subcarriers transmit data signals, after inserting pilots, the signal in subband i is S i , the signal sent in the frequency domain is X;

[0048] S3: After obtaining the UFMC signal X including the pilot sign...

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Abstract

The invention relates to a carrier synchronization method in a UFMC system, comprising the following steps: first, generating two sets of orthogonal codes at a sender, inserting the orthogonal codes as pilot sequences into original data, and modulating, filtering and sending the original data through UFMC; then, performing time-domain zero filling and 2N-FFT transform at a receiver, extracting data on even bands, sending the data to a filter matching the sender, getting the estimated value of data information using a zero forcing equalizer, extracting pilot signals and calculating the correlation between the two sets of pilot signals, and minimizing the correlation to achieve UFMC system carrier frequency synchronization; and finally, using an iterative algorithm to improve the accuracy of frequency offset estimation. According to the invention, the carrier frequency offset of the system is estimated by inserting a pilot frequency into each sub band of UFMC, so good properties of the UFMC system are maintained, and the accuracy and stability of frequency offset estimation are improved through iteration. Therefore, the bit error performance of the system is enhanced, the quality of communication is improved, and the design complexity of the filter in the UFMC system is reduced to a certain extent.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, and relates to a carrier synchronization method in a UFMC system. Background technique [0002] As a typical representative of multi-carrier technology, OFDM technology has been widely used in 4G. However, the following shortcomings of OFDM make it difficult to meet the needs of new scenarios. Firstly, each sub-carrier must be synchronized to maintain orthogonality, and the cost of synchronization will be unbearable when there are a large number of sensor nodes in the "wireless broadband" topic; secondly, it uses a square wave as the baseband waveform, and the carrier sidelobe is relatively large Finally, the CP length used is only related to the wireless channel, and the CP will cause a lot of waste of wireless resources when short frames are frequently transmitted. Therefore, Orthogonal Frequency Division Multiplexing (OFDM) may no longer be the best choice in 5G scenarios, and ...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 杨路何萍段思睿王珊
Owner CHONGQING UNIV OF POSTS & TELECOMM
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