Deinterleaving method for DTMB symbols

Abstract

The invention discloses a DTMB symbol de-interleaving method. The method comprises the following step: a de-interleaving memory is logically divided into 52 rows such as from row 0 to row 51; each row respectively writes 72 symbols in a same interleaved frame; row 0 writes the symbols such as 0, 52, 104, ..., 3692 of an interleaved frame; row 1 writes 72 symbols such as 1, 53, 105, ..., 3693; row 51 writes the symbols such as 51, 103, 155, ..., 3743; row N contains (52-N+R) blocks, R is 0 or a positive integer, and the size of each block is M symbols; after data of the interleaved frame fully writes the last block in a row of the de-interleaving memory, subsequent data memorized in the row is covered in the block written with invalid data of the row; 51 X 52 symbols are fully prewritten when initialization; and then a frame of de-interleaving common signal data is read out every frame symbol is written. The application of the method can reduce the consumption of time domain symbol de-interleaving memory space.

Description

technical field [0001] The invention relates to wireless signal transmission technology, in particular to a symbol deinterleaving method. Background technique [0002] In the field of wireless digital signal transmission, in order to resist time-selective fading, it is usually necessary to time-interleave the Common Interleaved Frames data in the Main Service Channel (Main Service Channel) in the transmission frame. [0003] In the DTMB (China National Terrestrial Digital Multimedia Broadcasting System Standard) system, in order to resist errors in the transmission process, the original adjacent data or data blocks are subjected to relatively independent channel distortion. The domain performs symbol interleaving processing, changes the sending order of each frame of data, and correspondingly performs time domain symbol deinterleaving processing on the data at the DTMB receiver end. [0004] In the DTMB system, an ordinary signal frame has a total of 3744 symbols, the inter...

AI Technical Summary

Problems solved by technology

In the 720 interleaving mode, it is necessary to collect 510 frames of interleaved data before deinterleaving, and output one frame of interleaved data. In the 240 interleaving mode, it takes 170 frames before deinterleaving. When deinterleaving and reading data, first set the band 0 The marked symbols are output in line order, and then the symbols with 1 mark are output in line order. In the 720 interleaving mode, at least 44M (510 frames × 3744 symbols × 24 bits / symbol) storage space is required to realize the entire deinterleaving process. implementation, memory consumption is large

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