Transmitting system, multiplexer and method for reducing power unevenness in sending machine band

A technology of transmitting system and in-band power, applied in transmission system, reducing energy consumption, transmission control/equalization, etc., can solve the problem of increasing in-band power unevenness, etc. effect of various methods

Inactive Publication Date: 2008-08-27
新奇点智能科技集团有限公司
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  • Abstract
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AI Technical Summary

Problems solved by technology

In the existing transmitter implementation technology, when the modulation mode of the transmission signal is QPSK or 16QAM, due to the non-random

Method used

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  • Transmitting system, multiplexer and method for reducing power unevenness in sending machine band
  • Transmitting system, multiplexer and method for reducing power unevenness in sending machine band
  • Transmitting system, multiplexer and method for reducing power unevenness in sending machine band

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Example Embodiment

[0035] The core idea of ​​the present invention is: when the multiplexer encapsulates the source data, the source data is encapsulated into a multiplexed frame, and the multiplexed frame includes three fields: a multiplexed frame header, a multiplexed frame payload and a padding. Fill random data or energy-balanced fixed data sequences into the padding field to ensure that all data included in the multiplexing frame achieves energy balance after modulation. In this way, the present invention removes the fixed data sequence with unbalanced energy from the source data before the modulator performs modulation.

[0036] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0037] refer to image 3As shown, it is a flow chart of the method for reducing transmitter in-band power unevenness in the present invention. When the multiplexer encapsulates the source data, the source data is encapsulated into a mu...

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Abstract

The invention provides a method used for reducing the roughness of the in-band power of the transmitter, a multiplexer and a transmission system. The information source data are encapsulated into a multiplex frame which is composed of three fields, including a multiplex frame head, a multiplex frame payload and a filling field. The method includes the procedures as follows: the filling field is filled with a random data sequence or a fixed data sequence with balance energy to ensure the data in the multiplex frame to realize balance energy after the modulation. Based on the method provided by the invention, the multiplexer and the transmission system, when the information source data are encapsulated into a multiplex frame, the filling field of the multiplex frame is filled with the random data sequence or the fixed data sequence with balance energy to reduce the fixed data sequence with unbalance energy in the information source data before the modulation of the transmission system and ensure the data in the multiplex frame to realize balance energy after the modulation; thereby, the roughness of the in-band power is improved; the damage for the transmitter is reduced and the requirement of stable operation of the system is well fulfilled.

Description

technical field [0001] The invention belongs to the technical field of mobile multimedia broadcasting, and in particular relates to a method for reducing in-band power unevenness of a China Mobile Multimedia Broadcasting (CMMB) transmitter, a multiplexer and a transmitting system. Background technique [0002] Broadcast system transmitters are quite different from mobile communication system transmitters, which is directly related to their transmission power. The transmission power of the broadcast system transmitter is usually very high, such as the transmitter of the CMMB system, etc., and its transmission power can reach up to four or five kilowatts. The transmitter of the mobile communication system, such as the transmitter of the 3G communication system, etc., usually has a lower transmission power, the maximum of which is not more than 40 watts. The large difference in transmit power leads to very different performance requirements for transmitters. One of the very ob...

Claims

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Application Information

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IPC IPC(8): H04B1/04H04B7/005
CPCY02D30/70
Inventor 张辉王西强钱炜
Owner 新奇点智能科技集团有限公司
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