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Method for forming guard intervals of frame structure and method and device for reconstructing circular convolution

A technology of guard interval and circular convolution, which is applied in the shaping network, digital transmission system, electrical components, etc. in the transmitter/receiver, and can solve problems such as large computational complexity

Active Publication Date: 2009-12-16
麦克盛科技(香港)有限公司
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Problems solved by technology

When L is large, even if the DFT fast algorithm is used for linear convolution, there is still relatively large computational complexity

Method used

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  • Method for forming guard intervals of frame structure and method and device for reconstructing circular convolution
  • Method for forming guard intervals of frame structure and method and device for reconstructing circular convolution
  • Method for forming guard intervals of frame structure and method and device for reconstructing circular convolution

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Embodiment Construction

[0027] Hereinafter, the present invention will be described in detail by taking a cyclically extended M-sequence with an order N of 8 as the PN guard interval as an example. Of course, the same applies to M sequences whose order N is other values. It should be particularly noted that the constant values ​​of the parameters described herein are only for the convenience of description of the embodiments, and are not intended to limit the invention.

[0028] After the order of the cyclically extended M sequence is determined, the selection of the PN guard interval length K can be selected according to the expected maximum channel delay spread L, and the larger K is, the greater the maximum channel delay spread L that the system can withstand. Simultaneously because this guard interval is the cyclic extension of N (in this example, N=8) order M sequence, requires its length K to be greater than the length of one period of M sequence but not more than the length of two periods of M...

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Abstract

The invention discloses a method for forming guard intervals of a frame structure in a wireless communication emission system. An initial state of a linear feedback shift register (LFSR) for generating a current frame of circular and continuous frame guard intervals is a final state of the LFSR for generating a previous frame of circular and continuous guard intervals. The invention also discloses a method and a device for reconstructing a signal channel and emitting an information data circular convolution. A required data sequence r1 in the current frame of the circular and continuous guard intervals, the whole information data sequence r2 behind the current frame of the circular and continuous guard intervals and a receiving data sequence r3 with a start length of a maximal predicted delay spread of a next frame of the circular and continuous guard intervals are respectively intercepted from receiving data r, and the obtained three data sequences are aligned and calculated so as to obtain a reconstructed signal channel and a circular convolution of emitted information data. The invention can reduce the calculation complexity and obtain higher accuracy.

Description

technical field [0001] The present invention relates to the field of wireless signal transmission, in particular to a method for forming a frame structure guard interval in a wireless communication transmission system; Information data circular convolution method and device. Background technique [0002] In the national standard of digital TV terrestrial broadcasting independently launched by our country - digital terrestrial multimedia broadcasting system (DTMB Digital Terrestrial Multimedia Broadcasting digital terrestrial multimedia broadcasting), the transmitter uses the time domain filling of the cyclic PN sequence as the time domain of the guard interval Synchronous Orthogonal Frequency Division Multiplexing (TDS-OFDM). Since the cyclic PN sequence is known at the receiver, the PN guard interval can be used for fast system synchronization and channel estimation. [0003] The PN guard interval plays an important role, but it will interfere with the information data pa...

Claims

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Application Information

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IPC IPC(8): H04L27/26H04L25/03H04L1/00H04H20/72
Inventor 蒋朱成李霄翔张帆张赟
Owner 麦克盛科技(香港)有限公司
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