Beacon transmitting method in mobile multimedia broadcasting system
A mobile multimedia and broadcasting system technology, applied in the field of beacon transmission, can solve the problems of unable to cope with channel delay expansion wireless channel, short synchronization signal sequence, etc., and achieve the effect of improving the search range and accuracy
Inactive Publication Date: 2008-01-30
INNOFIDEI TECHNOLOGIES INC
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[0024] In the GY / T220.1-2006 standard, the synchronization signal sequence used for cross-correlation calculations is relatively short. At the same time, when the beacon transmission method obtains the channel time-domain impulse response, it cannot cope with the wireless channel situation with large channel delay expansion.
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[0042] The present invention improves the accuracy of the initial synchronization by changing the structure of the synchronization signal in the beacon and its sending method, improves the search range of the channel time-domain impulse response, and can cope with channel delay expansion when obtaining the channel time-domain impulse response Larger wireless channel conditions.
[0043] Preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0044] Referring to FIG. 3 , it is a schematic diagram of the beacon structure of the present invention. Among them, the length of the synchronization signal sequence is 409.6 microseconds; and the partial sequence copy of the synchronization signal sequence whose length is 102.4 microseconds at the end is placed in front of the synchronization signal sequence, which is denoted as CP; then, the conjugate sequence of the CP sequence is placed in front of the CP , den...
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The invention discloses a beacon sending method of a mobile multimedia broadcast system and the beacon comprises a synchronous signal sequence. The method comprises the following steps that: (1) The synchronous signal sequence is generated; (2) Some of a continuous sequence is selected from an endposition of the synchronous signal sequence towards the front direction and is copied as a first cyclic prefix sequence; (3) According to the first cyclic prefix sequence, a second cyclic prefix sequence is gotten and a fixed corresponding relationship is formed between the second cyclic prefix sequence and the first cyclic prefix sequence; (4) When a beacon signal is transmitted, firstly the second cyclic prefix sequence is transmitted then the first cyclic prefix sequence and finally the synchronous signal sequence is transmitted. The beacon signal method of the invention increases the exactness of an initial synchronization and improves a searching range of a channel time domain impulsion response. When the channel time domain impulsion response is acquired, the invention can solve the problem that a larger wireless channel extends for a channel delay.
Description
technical field [0001] The invention relates to the technical field of mobile multimedia broadcasting, in particular to a beacon sending method in a mobile multimedia broadcasting system. Background technique [0002] In the mobile multimedia broadcasting system, the transmitter often sends a beacon signal, and then the receiver can firstly detect the starting position of the beacon through autocorrelation calculation, and obtain initial synchronization; then, use the local beacon sequence and the receiver The cross-correlation operation is performed on the received beacon sequence to obtain the time-domain impulse response of the channel. [0003] In the mobile multimedia broadcasting industry standard GY / T220.1-2006 promulgated by the State Administration of Radio, Film and Television of China, the beacon signal sent by the transmitter has a specific structure. [0004] Referring to FIG. 1 , it is a schematic diagram of the application of the existing beacon structure in ...
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IPC IPC(8): H04L7/10H04L27/26H04N5/44
Inventor 发明人请求不公布姓名
Owner INNOFIDEI TECHNOLOGIES INC