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Block interleaving with memory table of reduced size

A buffer memory and de-interleaving technology, applied in the direction of using interleaving technology for error correction/detection, forward error control, encoding, etc., can solve problems such as memory cost and space

Inactive Publication Date: 2008-02-06
KONINKLIJKE PHILIPS ELECTRONICS NV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the main disadvantage of using SRAM for tables is that this type of memory costs space and, for the required amount of memory is 248 x 304 bytes, results in a rather large area in the encoder / decoder IC being allocated only for The table

Method used

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  • Block interleaving with memory table of reduced size
  • Block interleaving with memory table of reduced size
  • Block interleaving with memory table of reduced size

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Embodiment Construction

[0033] Figure 1 shows a digital communication system comprising a transmitter 11, a receiver 12 and a channel through which data 10 in the form of a sequence of symbols is transmitted from the transmitter 11 to the receiver 12. The channel can be represented as shown in the figure as an information carrier 13, as this is known from communication principles. The transmitter 11 or video recorder includes an encoder 14 which encodes the data 10 in a form so as to make the data less sensitive to noise, and a modulator 15 which generates an analog signal 18 from the encoded data which passes through the Suitable recording means, not shown, record on the information carrier 13 . The receiver 12 or reader comprises a demodulator 15' for demodulating the regenerated analog signal 18' (regenerated from the information carrier 13 by suitable read-out means, also not shown in the figure), in order to reconstruct the encoded data, further comprising a decoder 14' for decoding the reconst...

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Abstract

Interleaving improves noise rejection in digital communication and storage systems. According a known scheme, the interleaving / deinterleaving is achieved by storing symbols in a temporary memory table of R rows x C columns in a row by row order, and reading them in a column by column order, or vice versa, so obtaining a rearranged order. Methods and devices for interleaving and deinterleaving are proposed which accomplish the same interleaving / deinterleaving operation with a reduced size of the temporary memory table. The rearrangement of the symbols according to the rearranged order is accomplished by using a table with a reduced memory size, in combination with the order with which the symbols are fetched from or stored in a further memory. The invention further relates to ICs and apparatuses for interleaving and / or deinterleaving.

Description

technical field [0001] The present invention relates to deinterleaving methods, and to corresponding interleaving methods. [0002] The invention also relates to deinterleavers and corresponding interleavers. Background technique [0003] Interleaving is used in some digital communication systems to improve the reliability of communication. Several schemes of interleaving and deinterleaving are known, where deinterleaving is the inverse of interleaving: for example so-called block interleaving, according to which the sequence of symbols to be transmitted is divided into blocks and for each block belongs to the block symbols are shuffled within the block before being sent. For example, according to a specific block interleaving scheme, a table of R rows and C columns is used, and each element or unit in the table can contain a symbol: the symbol of each block (an R×C block of symbols) is passed by The order of the rows is stored in the table and read out in column-by-colum...

Claims

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Application Information

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IPC IPC(8): H03M13/27
CPCH03M13/2707H04L1/0071H03M13/2782H03M13/27
Inventor B·范登博施
Owner KONINKLIJKE PHILIPS ELECTRONICS NV
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