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

A transmission system and internal power technology, which is applied in broadcast transmission system, transmission control/equilibrium, energy consumption reduction, etc., can solve the problems of increasing in-band power unevenness, improve in-band power unevenness, and meet stable work , the effect of meeting the application requirements

Inactive Publication Date: 2008-08-27
INNOFIDEI TECHNOLOGIES INC
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  • Claims
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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-randomness of the filling data of the multiplexing frame input to the modulator, the source data after modulation increases the in-band power unevenness

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

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Embodiment Construction

[0047] 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 then output, and the multiplexed frame includes a multiplexed frame header, a multiplexed frame payload and a filling three fields, so consider parsing the multiplexing frame before modulating the data carried by the multiplexing frame, and after obtaining the padding field, fill the padding field with random data or energy-balanced fixed data sequence, It is guaranteed that all the data included in the multiplexing frame achieve 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.

[0048] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0049] refer to image 3 As shown, it is a flow chart of the metho...

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Abstract

The invention provides a method used for reducing the roughness of the in-band power of the transmitter, a modulator and a transmission system. The data carried by the multiplex frame outputted by a multiplexer is modulated by the transmission system. The multiplex frame is composed of three fields, including a multiplex frame head, a multiplex frame payload and a filling field. The method includes the steps as follows: the multiplex frame is analyzed to obtain the filling field before the modulation; 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 modulator and the transmission system, the fixed data sequence with unbalance energy in the information source data before the modulation of the transmission system is reduced, ensuring 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 modulator 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 obvi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04H20/65H04B7/005
CPCY02D30/70
Inventor 张辉王西强钱炜
Owner INNOFIDEI TECHNOLOGIES INC
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