Pilot frequency sequence structure in OFDM/OQAM system and method for channel estimation

A technology for pilot sequence and channel estimation, which is applied in the field of channel estimation based on pilot signals, can solve the problems of reduced efficiency and large dynamic range of high power amplifiers, and achieves the effect of improving efficiency and reducing linear dynamic range.

Inactive Publication Date: 2009-09-02
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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AI Technical Summary

Problems solved by technology

In order to ensure that the signal transmitted by the OFDM system avoids nonlinear distortion, the high-power amplifier of the RF front-end of the OFDM system needs a large dynamic range, which leads to a decrease in the efficiency of the high-power amplifier.

Method used

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  • Pilot frequency sequence structure in OFDM/OQAM system and method for channel estimation
  • Pilot frequency sequence structure in OFDM/OQAM system and method for channel estimation
  • Pilot frequency sequence structure in OFDM/OQAM system and method for channel estimation

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Experimental program
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Effect test

Embodiment approach 1

[0061] At the transmitter, first follow the Figure 4 Generate a pilot signal consisting of three segments of symbols, wherein the first segment 9 and the third segment 11 are all zeros, and the value of the middle segment 10 is (1, 0, -1, 0, ..., -1, 0, 1, 0); then the generated pilot sequence is added to the head of the data block in units of each segment, and then transmitted according to the subsequent processing method of the baseband data signal in the conventional OFDM / OQAM system.

[0062] At the receiving end, first, the receiving end generates a sequence that is the same as the pilot sequence of the transmitting end, and processes the received signal into a baseband digital signal according to the conventional OFDM / OQAM system’s RF front-end processing method, and obtains the representative pilot corresponding to the transmitting end The three-segment symbol of the symbol, and then take out all the odd-numbered symbols in the middle segment, and then divide each bit ...

Embodiment approach 2

[0064] At the transmitter, first follow the Figure 5 Generate a pilot signal consisting of five segments of symbols, where the first segment 12, the third segment 14, and the fifth segment 16 are all zeros, and the second segment 13 symbols take values ​​(1, 0, -1, 0, ... , -1, 0, 1, 0); the value of the 15 symbols in the fourth segment is (0, 1, 0, -1, ..., 0, 1, 0, -1), and the 13 symbols in the second segment are The value has no correlation with the value of the 15th symbol in the fourth paragraph. Add the generated pilot sequence to the head of the data block in units of each segment, and then transmit it after processing the baseband data signal in a conventional OFDM system;

[0065] At the receiving end, first, the receiving end generates a sequence that is the same as the pilot sequence of the transmitting end, and processes the received signal into a baseband digital signal according to the conventional OFDM / OQAM system’s RF front-end processing method, and obtains...

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Abstract

The invention discloses a sequence structure with low peak-to-average power ratio for the channel estimation of an OFDM / OQAM system, and a method for performing the channel estimation by using the structure. In the structure, except that a front segment and a rear segment have a same structure according to a conventional pilot sequence (all-zero data serves as a protective segment), at least half signs (only at odd bits or even bits) of one segment or three segments in the middle are zero, and the values of the signs at any bits of the remaining parts are 1 or -1 at random. Because the values of most parts are zero and the values of the signs at any bits of the remaining parts are 1 or -1 at random, the method for the channel estimation can reduce peak-to-average power ratio while eliminating inter-sign interferences and inter-subcarrier interferences caused by multi-path interferences, the structure and the method can satisfy the linear dynamic range of a radio frequency front-end high power amplifier so as to reduce the linear requirements on the high power amplifier by the OFDM / OQAM system.

Description

technical field [0001] The invention belongs to the channel estimation technology in the OFDM / OQAM system, in particular to a channel estimation method based on pilot frequency signals in the case of high power amplifiers. Background technique [0002] As we all know, in the existing communication technology, the Orthogonal Frequency Division Multiple Access technology (OFDM / offset QAM, referred to as OFDM / OQAM) based on the interleaved quadrature amplitude modulation method is characterized by its high spectrum utilization and good time-frequency focus. It has become one of the main candidate technologies for future mobile multimedia communication. [0003] The mathematical expression of the transmitted signal s(t) of the OFDM / OQAM system is: [0004] s ( t ) = Σ n Σ m = 0 M ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/03H04L27/26
Inventor 胡苏武刚李少谦
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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