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Blind carrier offset estimation method in CP-FBMC communication system

A CP-FBMC and communication system technology, applied in the field of wireless communication, can solve the problems of performance degradation, high complexity, and reduced complexity

Active Publication Date: 2017-09-26
XI AN JIAOTONG UNIV
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Problems solved by technology

The early blind estimation algorithm mainly used the second-order cyclostationarity of the FBMC multi-carrier system, and the complexity was high
"Blind Symbol Timing and CFO Estimation for OFDM / OQAM Systems" published by Davide Mattera and MarioTanda in IEEE Transactions on Wireless Communications, 2013, 12(1): 268-277 proposed to use the conjugate symmetry of FBMC to greatly reduce the complexity , but with reduced performance

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  • Blind carrier offset estimation method in CP-FBMC communication system
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  • Blind carrier offset estimation method in CP-FBMC communication system

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Embodiment Construction

[0053] The present invention will be further explained below in conjunction with specific embodiments and accompanying drawings.

[0054] see figure 2 , the present invention comprises the following steps:

[0055] 1. Transmitter:

[0056] (1) see figure 1 , M subcarriers at the transmitter, subcarrier numbers m=0, 1,..., M-1, subcarrier numbers differ by 1, which means that the subcarriers are adjacent, and a random continuous virtual subcarrier allocation scheme is adopted: select the number of virtual subcarrier groups P, the number Q of continuous virtual subcarriers in each group, where Q≥3, record the serial number of the first virtual subcarrier in each group as m i,1 , i=1,2,...P,m i,1 ∈[0,M-1]; considering the cyclicity of the Cyclic-FBMC system before adding CP to CP-FBMC, the numbers of the remaining virtual subcarriers in each group are ((m i,1 +j)) M means m i,1 +j takes M as the result of the loop, m i,1+j ∈[0,M-1], the M subcarriers are all data sub...

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Abstract

The present invention discloses a blind carrier offset estimation method in a CP-FBMC communication system. The objective of the invention is to improve the estimation performance while ensuring frequency spectrum efficiency through design of a reasonable virtual subcarrier distribution mode. The technical scheme comprises: distributing three or more than three virtual subcarriers at the emission end of the CP-FBMC system, employing the virtual subcarriers being not adjacent to data subcarriers at the receiving end of the system to calculate a cost function, and the frequency offset test value corresponding to the minimum value of the cost function is a frequency offset estimation value.

Description

technical field [0001] The invention relates to a frequency offset estimation method of an FBMC system in the wireless communication field, in particular to a blind frequency offset estimation method in a CP-FBMC communication system. Background technique [0002] Because the multi-carrier modulation system can not only provide high-speed data transmission, double the system capacity, but also effectively resist the frequency selective fading of the channel, it has received extensive attention and research from academia and industry. However, high out-of-band leakage has always been a major drawback of carrier modulation systems. FBMC (Loop Filter Bank Multi-Carrier) technology can effectively reduce the out-of-band leakage of signals by using a prototype filter with good time-frequency focusing characteristics. In addition, FBMC technology introduces operations such as polyphase filter and fast Fourier transform, which greatly reduces its own complexity and calculation amo...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L27/00
CPCH04L27/0014H04L27/264H04L27/2672H04L27/2678H04L2027/0026
Inventor 王慧明史珂郑修鹏
Owner XI AN JIAOTONG UNIV
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