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System and method for making frame synchronization tracking and channel detection based on frequency domain sequence

A frame synchronization and frame synchronization sequence technology, applied in the field of digital information transmission, can solve problems such as exceeding the system bandwidth limit, and achieve the effect of low implementation complexity and good randomness characteristics.

Inactive Publication Date: 2008-04-23
TIMI TECH
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  • Claims
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Problems solved by technology

Under the condition of 10MHz sampling rate, the bandwidth of this sequence is at least 10MHz, which will exceed the system bandwidth limit

Method used

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  • System and method for making frame synchronization tracking and channel detection based on frequency domain sequence
  • System and method for making frame synchronization tracking and channel detection based on frequency domain sequence
  • System and method for making frame synchronization tracking and channel detection based on frequency domain sequence

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Embodiment Construction

[0018] The devices in the system for frame synchronization tracking and channel type detection using frequency domain random sequences of the present invention will be described in detail below with reference to the accompanying drawings.

[0019] figure 1 Shown is a block diagram of the transmitting device of the preferred embodiment of the system for frame synchronization tracking and channel type detection using frequency domain random sequences of the present invention.

[0020] Such as figure 1 As shown, the transmitting device includes: a frequency-domain random sequence generation unit 101 , a frequency-time domain transformation unit 102 and a time-domain framing unit 103 .

[0021] The frequency domain random sequence generation unit 101 includes two parts (not shown) a complex m-sequence generator and an m-sequence locator.

[0022] The complex m-sequence generator has a shift register. In this embodiment, the initial state of the shift register is 011 1010 1101, s...

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Abstract

The method includes steps: generating a frequency domain complex random sequence (FDCRS) in transmitting set; using IFFT converts FDCRS into time domain frame synchronizing sequence (TDFSS); TDFSS is inserted into transmitted frame and sent to the receiving device; in the receiving device, FFT converts the received TDFSS to frequency domain sequence (FDS); IFFT converts FDS to channel impulse response (CIR); selecting effective path in channel based on ratio between maximum value of power of CIR and threshold of preset effective path. Using obtained effective path in channel calculates error of frame synchronization in order to implement synchronized tracking and calculate adaptation function of channel multipath type in order to determine channel type. In the method, bandwidth of frame-synchronized sequence is smaller than sampling rate of system; and the method implements frame-synchronized tracking and estimating channel type by paying lower complexity of implementation.

Description

technical field [0001] The present invention relates to the technical field of digital information transmission, in particular to an OFDM-based digital broadcasting system, in particular to a system and method capable of performing frame synchronization tracking and channel type detection by using frequency-domain random sequences. Background technique [0002] In addition to wide coverage and large program capacity, digital broadcasting is characterized by broadcasting, one-to-multipoint, one-to-one, and the cost of broadcasting information has nothing to do with the number of users. Therefore, as an important part of the information communication industry, digital broadcasting plays an important role in the construction of national information infrastructure, the realization of universal service and the national information security strategy. [0003] In order to facilitate receivers to implement functions such as frame synchronization, frequency offset estimation, and cha...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L7/04H04L25/02
Inventor 葛启宏白栋陶涛王军伟
Owner TIMI TECH
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