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Partial transmission sequence method based on minimal non-linear noise for orthogonal frequency-division multiplexing system

An orthogonal frequency division and partial transmission technology, which is applied in the field of OFDM communication, can solve the problems that cannot reflect the performance of the system bit error rate and reduce the peak power of the signal.

Inactive Publication Date: 2003-07-30
TSINGHUA UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, this method only reduces the peak power of the signal under the condition that the average power of the system remains unchanged, and cannot reflect the overall bit error rate performance of the system.

Method used

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  • Partial transmission sequence method based on minimal non-linear noise for orthogonal frequency-division multiplexing system
  • Partial transmission sequence method based on minimal non-linear noise for orthogonal frequency-division multiplexing system
  • Partial transmission sequence method based on minimal non-linear noise for orthogonal frequency-division multiplexing system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Example 1: see figure 2

[0033] Step 1: Evenly decompose the N-point frequency-domain vectors to be transmitted in a subcarrier block into V (V≥2) sub-vectors in a contiguous manner X = Σ v = 1 V X ( v ) , that is

[0034] Where X(l): the lth point of the vector X

[0035] x v (l): sub-vector X v the lth point of

[0036] The contiguous method means that adjacent subcarriers are divided into the same part as much as possible. For example, when the system uses N=512 subcarriers and is divided into V=2 parts, then the 0th to 255th subcarriers are in the first part, and the 256th to 511th subcarriers are in the second part

[0037] Step 2: Perform IFFT operation on the frequency-domain sub-vector to obtain the time-domain sub-vector

[0038] ...

Embodiment 2

[0051] Example 2: see image 3

[0052] The steps are basically the same as Example 1, the difference is:

[0053] In step (1), the N-point frequency-domain vectors to be transmitted in a sub-carrier block are randomly and uniformly decomposed into V (V≥2) sub-vectors X = Σ v = 1 V X ( v ) .

[0054] The specific implementation adopts the following method: for example, when the system adopts N=512 subcarriers and is divided into V=2 parts, first randomly generate 512 independent and identically distributed Gaussian random variables t with 0 as the mean value 0 ~t 511 , and make the following judgments for i=0~511 in turn , 0≤i≤511

[0055] Partially divided, and to ensure the randomness and uniformity of the division.

[0056] Figure 4 It is a comparison char...

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Abstract

A partial transmission sequential based on minimum nonlinear noise for orthogonal frequency division multiplexing system devides the frequency domain sequence to be sent into a number of part and carrys on different phase rotary for each part so the method has raised the performance of entire bit error rate for the system by using nonlinear noise power at the judgemenet basis under the condition that system average power remains unchanged.

Description

technical field [0001] A partial transmission sequence method based on minimum nonlinear noise in an orthogonal frequency division multiplexing (OFDM) system belongs to the technical field of orthogonal frequency division multiplexing communication. Background technique [0002] Orthogonal Frequency Division Multiplexing (OFDM) technology uses parallel data transmission and sub-channels to overlap each other, while making full use of the available bandwidth, avoiding the use of high-speed equalization, and combating burst noise. It is currently attracting much attention in the field of communication, and has been widely used in high bit rate digital subscriber line (HDSL), digital audio broadcasting (DAB), digital video broadcasting (DVB) and wireless local area network (WLAN). IEEE 802.11a standard OFDM technology has also been incorporated into it. [0003] However, due to the statistical independence among the sub-carriers, the corresponding time-domain waveforms show se...

Claims

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Application Information

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IPC IPC(8): H04J11/00H04L27/01H04L27/10
Inventor 葛启宏陆建华梅顺良
Owner TSINGHUA UNIV
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