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Subcarrier wave modulation method and device therefore

A sub-carrier modulation and carrier modulation technology, applied in the field of digital transmission, can solve the problems of complex implementation, inflexible modulation technology, and high equipment complexity, and achieve the effect of easy implementation.

Inactive Publication Date: 2009-12-02
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing frequency hopping technology requires synthesizers, controllers and other equipment, which is very complicated to implement
[0005] To sum up, the existing modulation technology is not flexible enough, and the complexity of the equipment is high when it is implemented

Method used

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  • Subcarrier wave modulation method and device therefore
  • Subcarrier wave modulation method and device therefore
  • Subcarrier wave modulation method and device therefore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] see figure 1 , this embodiment provides a subcarrier modulation method, which implements a flexible subcarrier modulation technique by changing the number and position information of effective subcarriers, specifically including:

[0026] Step 11: generate a CP-OFDM data frame from the data, the number of effective subcarriers of the CP-OFDM data frame is K, the number of total subcarriers is M, and the number of virtual subcarriers is M-K;

[0027] The concrete steps of generating above-mentioned CP-OFDM data frame include:

[0028] Step 111: generating a first frequency-domain OFDM block of M symbols by filling the K frequency-domain OFDM symbols of the data with zero symbols, the number of the zero symbols being M-K;

[0029] The above conversion process applies the virtual sub-carrier technology. The so-called virtual subcarrier technology is to modulate part of the subcarriers of the frequency domain signal with zero symbols. This part of the subcarriers is calle...

Embodiment 2

[0061] see Figure 4 , this embodiment provides a subcarrier modulation device, which implements a flexible subcarrier modulation technique by changing the number and position information of effective subcarriers, and the device specifically includes:

[0062] CP-OFDM data frame generation module: used to generate a CP-OFDM data frame from data, the number of effective subcarriers of this CP-OFDM data frame is K, the number of total subcarriers is M, and the number of virtual subcarriers for M-K;

[0063] CP-OFDM training frame generation module: for the CP-OFDM data frame generated according to the CP-OFDM data frame generation module, the training sequence is generated into a CP-OFDM training frame, and the number of effective subcarriers of the CP-OFDM training frame is L, the number of total subcarriers is N, and the number of virtual subcarriers is L-N;

[0064] Slot frame generation module: used for the CP-OFDM training frame generated by the CP-OFDM training frame gen...

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PUM

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Abstract

The invention discloses a subcarrier modulation method and a device therefore, belonging to the field of digital transmission.The method comprises the following steps: data is generated into a CP-OFEM data frame, the number of effective subcarriers is K, the number of the total subcarriers is M, the number of virtual subcarriers ranges from M to K; according to the CP-OFDM data frame, training sequence is generated into a CP-OFDM training frame, the number of effective subcarriers of the CP-OFDM training frame is L, the number of the total subcarriers is N, the number of the virtual subcarriers ranges from L to N; the CP-OFDM training frame is taken as a time slot frame head, the CP-OFEM data frame or the plurality of CP-OFEM data frames generated according to the generation method of the CP-OFEM data frame are taken as effective data division, the time slot head and the effective data division are integrated into a time slot frame; effective subcarrier information of the CP-OFEM data frame is changed; according to the changed information, the next time slot frame is generated according to the generation method of the time slot frame.In the invention, a flexible and easily achievable subcarrier modulation technology is realized by changing the number and position information of the effective subcarriers.

Description

technical field [0001] The invention relates to the field of digital transmission, in particular to a subcarrier modulation method and device. Background technique [0002] In a digital communication system, the signal needs to be modulated so that the signal is suitable for the transmission of the channel. [0003] The existing variable bandwidth modulation technology realizes variable bandwidth by changing the sampling rate. The realization principle is: After the signal is sampled by a sampling device with a variable sampling rate, the Nyquist filter is used to filter out the sampled image frequency. The parameters of the Nyquist filter can be designed to adapt to different sampling rates. However, the parameters of the Nyquist filter are fixed parameters, which can only adapt to several sampling rates, so the sampling device can only set several fixed sampling rates, so that the system bandwidth can only be changed in a limited range and limited frequency points. [00...

Claims

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Application Information

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IPC IPC(8): H04L27/26
Inventor 彭克武董雪杨知行潘长勇阳辉王军
Owner TSINGHUA UNIV
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