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Power suppression method and device for power limited frequency band in tds-ofdm

A power and frequency band technology, applied in power management, multi-frequency code system, advanced technology, etc., can solve the problems of increased power leakage, without considering the influence of power suppression, etc., achieve low complexity, improve power suppression performance, and spectrum shaping good effect

Active Publication Date: 2016-01-20
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the TDS-OFDM system, the frequency domain PN sequence is a known sequence of the system, which is used for system synchronization and channel estimation, but the impact on power suppression was not considered in the initial design. If the PN sequence next to the power-limited frequency band appears Continuous 1 or -1 sequences, such as [1111] and [-1-1-1-1], will cause the frequency spectrum at this frequency band to be the in-phase superposition of the sinc function, which will increase the power leakage

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  • Power suppression method and device for power limited frequency band in tds-ofdm
  • Power suppression method and device for power limited frequency band in tds-ofdm
  • Power suppression method and device for power limited frequency band in tds-ofdm

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Embodiment 1

[0056] Embodiment 1 provides a specific implementation manner of a power suppression method for a power-limited frequency band in a TDS-OFDM system proposed by the present invention.

[0057] In this embodiment, the TDS-OFDM system with dual PNs is used for transmission, the occupied frequency band is 2-30MHz, the actual transmission frequency band bandwidth is 26.46MHz, the training sequence is composed of two identical sequences, and the discrete Fourier transform of each sequence The field is a pseudo-random sequence of length 256, denoted as The length of the OFDM data block to be sent is 4096, 256QAM modulation is adopted, the LDPC code rate is 0.8, and the interleaving depth is 720.

[0058] S1. According to the distribution of the power-limited frequency band, the training sequence and the subcarriers on the corresponding power-limited frequency band of the OFDM data block to be sent are turned off;

[0059] In this embodiment, in order to reduce the interference of t...

Embodiment 2

[0067] Embodiment 2 provides a specific implementation manner of a power suppression method for a power-limited frequency band in a TDS-OFDM system proposed by the present invention.

[0068] In this embodiment, the TDS-OFDM system of a single PN is used for transmission, the occupied frequency band is 12-20MHz, the actual transmission frequency band bandwidth is 7.56MHz, and the discrete Fourier domain of the training sequence is a pseudo-random sequence with a length of 256. The length of the transmitted OFDM data block is 2048, 256APSK modulation is adopted, the LDPC code rate is 0.4, and the interleaving depth is 720.

[0069] S1. According to the distribution of the power-limited frequency band, the training sequence and the subcarriers on the corresponding power-limited frequency band of the OFDM data block to be sent are turned off;

[0070] In this embodiment, in order to reduce the interference of the system to the 13-13.03 MHz power-limited frequency band with a widt...

Embodiment 3

[0077] Embodiment 3 provides a specific implementation manner of a power suppression method for a power-limited frequency band in a TDS-OFDM system proposed by the present invention.

[0078] In this embodiment, the TDS-OFDM system with dual PNs is used for transmission, the occupied frequency band is 22-30MHz, and the actual transmission frequency band bandwidth is 7.56MHz. The training sequence is composed of two identical sequences, and the discrete Fourier transform of each sequence is The field is a pseudo-random sequence of length 256, denoted as The length of the OFDM data block to be sent is 8192, 1024QAM modulation is adopted, the LDPC code rate is 0.8, and the interleaving depth is 720.

[0079] S1. According to the distribution of the power-limited frequency band, the training sequence and the subcarriers on the corresponding power-limited frequency band of the OFDM data block to be sent are turned off;

[0080] In this embodiment, in order to reduce the interfere...

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Abstract

The invention discloses a power suppression method for a power-limited band in TDS-OFDM and a device. The method includes the following steps: (S1) according to the distribution of the power-limited band, the subcarriers of a training sequence and an OFDM data block to be sent on the corresponding power-limited band are closed; (S2) preset sequences are used for replacing the subcarriers of the training sequence beside the power-limited band; (S3) time-domain framing and time-domain windowing are carried out on the processed training sequence and the OFDM data block to be sent, and after up-conversion, filtration and signal amplification, the training sequence and the OFDM data are sent. The invention can further enhance the power suppression performance of a TDS-OFDM system, so that the system can better meet the requirement on power suppression on the power-limited band, and the invention has the advantages of low complexity, good frequency spectrum-shaping effect and the like.

Description

technical field [0001] The present invention relates to the technical field of digital signal transmission, in particular to a power suppression method and device for a power-limited frequency band in a Time Domain Synchronous Orthogonal Frequency Division Multiplexing (TimeDomainSynchronous OFDM, TDS-DFDM) system. Background technique [0002] In order to regulate the use of spectrum resources and reduce spectrum conflicts, countries around the world have specific radio laws and regulations to formulate corresponding principles for unified management and allocation of spectrum resources according to their own conditions. For example, some frequency bands are dedicated to services such as amateur radio, aerospace or deep space communications, and emergency communications, and cannot be interfered by strong electromagnetic radiation. Therefore, in a public communication system such as a power line communication (PowerLine Communication, PLC) system, in order to reduce interfe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/26H04W52/02
CPCY02D30/70
Inventor 杨昉丁文伯潘长勇宋健
Owner TSINGHUA UNIV
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