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Method for recognizing low complexity frame head pattern

A pattern recognition, low-complexity technology, applied in the field of digital information transmission, can solve the problem of high complexity, achieve the effect of reducing the complexity and reducing the complexity of hardware implementation

Inactive Publication Date: 2011-04-06
XIDIAN UNIV
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Problems solved by technology

In order to process continuous input data, each symbol rate clock needs to calculate a correlation value. Obviously, this method is too complex to implement. Only the autocorrelation part requires L corr complex multiplier, L corr a conjugation operation and L corr -1 addition, and the shift register requires L d +2L corr -1

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  • Method for recognizing low complexity frame head pattern
  • Method for recognizing low complexity frame head pattern
  • Method for recognizing low complexity frame head pattern

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Embodiment Construction

[0025] refer to figure 1 , the realization process of the present invention is as follows:

[0026] (1). Under the action of the symbol enable signal generated by the numerically controlled oscillator NCO, the input single symbol rate complex data r(k) is stored in L d =511 long shift registers, wherein the digitally controlled oscillator that utilizes the fixed coefficient W input produces a single symbol rate enabling signal, ensuring that data participates in correlation operations when the signal is valid, and the fixed value is expressed as:

[0027] W=f s / f sym -1

[0028] Among them, f s Indicates the sampling rate of the received signal, f sym Indicates the symbol rate, such as in the national standard system, the typical f s= 30.4MHz, f sym =7.56MHz, so W is approximately equal to 3.02116.

[0029] figure 2 It is a fixed-parameter NCO to achieve single symbol rate data extraction method. The selector selects W or -1 under the control of the single sign en...

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Abstract

The invention discloses a frame head mode identification method with low complexity. Aiming at the characteristic that a plurality of PN modes can be selected in the Chinese digital TV ground standard, a receiver identifies and judges a current sending mode through a frame head mode. The method comprises the following steps: (1) a register unit with 511 bytes saved in a baseband complex data signbit is input; (2) PN420 and PN94 modes are selected, the calculated interval lengths are prefix and suffix correlation of 255 and 511 respectively, and the correlation length is selected as 165; (3) absolute peak values of two correlated results obtained in a frame are compared, a frame head mode corresponding to the larger peak value is determined if one of the correlation peak values is more than 3 times of the other peak value, or PN595 is determined; and (4) the operation can be terminated if the same result is determined in three continuous frames. The method has the advantages of low complexity and easy hardware realization, and is used for the identification of sending modes in national standard receivers.

Description

technical field [0001] The invention belongs to the technical field of digital information transmission, and relates to a pattern recognition method in a wireless communication receiver with multiple PN frame header modes, which can be used for the transmission pattern recognition in Chinese digital terrestrial television receivers. Background technique [0002] In wireless communication systems, in order to facilitate receivers to achieve synchronization, channel estimation, and equalization, etc., frame structures are often used to assist in the implementation, and in order to suit different applications, multiple frame structures often coexist in the same standard. For example, China's digital terrestrial television standard GB 20600-2006 stipulates that the single-carrier and multi-carrier systems are compatible, and the multi-carrier system adopts the core technology of time-domain synchronous orthogonal frequency division multiplexing (TDS-OFDM). The main feature of th...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04L27/26
Inventor 宫丰奎王勇葛建华
Owner XIDIAN UNIV