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Time de-interweaving method

A technology of deinterleaving and time, applied in the field of time deinterleaving

Active Publication Date: 2008-08-13
MAXSCEND MICROELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the on-chip SRAM (on-chip SRAM) is used to store the 3.16 megabits of data, it will be a very large hardware cost for the chip; Brings a lot of extra overhead to the entire system

Method used

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Examples

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Embodiment Construction

[0019] Take the T-DMB system as an example below to illustrate the time deinterleaving method of the present invention. As shown in Figure 5, the entire deinterleaving memory is divided into 15 logical FIFOs, wherein the first FIFO stores the first 15 common interleaving frames The data whose index number i modulo 16 is 0, the second FIFO saves the data whose index number i modulo 16 is 8 in the first 14 ordinary interleaving frames...the 15th FIFO saves the index numbers in the first two ordinary interleaving frames i modulo 16 is 7 data. The data in the bold black box in Figure 5 is a frame of data that can be output after deinterleaving is currently completed, the data in the dotted line box is a new frame of data that is currently entering, and the data in the bold dotted line box indicates the part of the data that is currently entered and output (Index number i modulo 16 equals 15).

[0020] Image 6 As shown, according to the input data enable signal, a 4-bit 16 count...

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Abstract

The invention discloses a time de-interwaving method. Number of data composed corresponding to common interweaving is M; adopting c<r, i>=b<r', i>=b<r-y, i> as time interweaving, y is reversed sequence value of i module z of data index number. z is integral power of 2 more than 1; generating de-interwaving memory address according to de-interwaving parameter k and outputting data and storing data from the memory unit of corresponding address of the de-interwaving memory according to memory address and k; whole de-interwaving memory is divided into (z-1)th logical FIFO. First FIFO stores data of reversed sequence value of i module z of previous (z-1)th data index number. The second FIFO stores data of reversed sequence value of i module z of previous (z-2)th data index number,..., the (z-1)th FIFO stores data of reversed sequence value of i module z of previous (z-2)th data index number. The method can greatly reduce required content of de-interwaving memory, which reduces hardware cost.

Description

technical field [0001] The invention belongs to the field of wireless signal transmission, in particular to a time 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 (Common Interleaved Frames) data in the Main Service Channel (Main Service Channel) in the transmission frame (frame). Data is B r =(b r，0 , b r，1 , b r，2 ,...,b r，i ,...,b r，M-1 ), where the subscript r represents the rth ordinary interleaving frame, M is the number of data in the ordinary interleaving frame it contains, and i is the index number of each data; similarly, suppose the interleaved data is C r =(c r，0 , c r，1 , c r，2 ,...,c r，i ,...,c r，M-1 ), where c r，i =b r’，i , r' is a function of r and i modulo z (z is an integer power of 2 greater than 1, expressed in binary), set the reverse order value of i modulo z (the rever...

Claims

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Application Information

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IPC IPC(8): H03M13/27
Inventor 潘国振
Owner MAXSCEND MICROELECTRONICS CO LTD