Method and apparatus for identification of signal frame and pattern detection

Abstract

The invention discloses a mode detection and frame identification method which comprises the following steps: a signal frame sequence is received and local pseudo random code sequences aiming at different frame header modes are respectively generated. A glide correlation is generated between samplings of input signal frame sequences and the local pseudo random code sequences which are generated. A sequence number of the current signal frame is determined according to the distance (dist) among relevant peak values in adjacent observation windows. The first three steps are repeated to calculate the sequence number of a next signal frame. When the sequence number of the current signal frame is matched with the sequence number of the next signal frame, the corresponding signal frame mode and sequence numbers are outputted. Compared with the prior art, the adoption of a correlation function allows the invention to avoid square root computing, therefore, the complexity of implementation is low. Furthermore, compared with the prior calculation method based on the look-up table computing method, the invention determines the signal frame sequence number with a summed simple calculation formula, thereby consuming dramatically less resources.

Description

technical field [0001] The present invention relates to digital TV terrestrial broadcasting transmission communication, and more specifically, relates to a mode detection and signal frame identification method and device thereof. Background technique [0002] The digital TV terrestrial broadcast transmission system specifies the frame structure, channel coding and modulation methods of the digital TV terrestrial broadcast transmission system signal in the UHF and VHF frequency bands. figure 1 The frame structure of the existing digital TV terrestrial broadcasting transmission system is shown. From figure 1 It can be seen that the data frame structure of the system includes 4 layers. Among them, the basic unit of the data frame structure is a signal frame, which consists of two parts: a frame header and a frame body. A superframe is defined as a group of signal frames. Framing is defined as a set of superframes. The top level of the frame structure is called the day fram...

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Problems solved by technology

[0022] 2. The above 2) needs to use the digital differentiator d c (k)

Taking the implementation of single-precision floating-point square root calculation in FPGA as an example, if a Xilinx xc4000 device is used, implementing square root calculation in a pipelined manner requires 408 CLB computing resources and 675 CLB registers, and a delay of 15 clock cycles is introduced.

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