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Interleaving method for reducing interference by synchronous channel signal

A technology of signal interference and synchronous channel, which is applied in the field of wireless channel coding and interleaving, can solve the problems of link drop and high signaling error, achieve the effect of data dispersion and average, improve overall performance, and improve stability

Inactive Publication Date: 2006-08-02
HUAWEI TECH CO LTD
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  • Abstract
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  • Application Information

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Problems solved by technology

After the 3.4K wireless layer 3 signaling (channel-associated signaling) undergoes a series of channel codec processing, half of the symbols of the signaling fall completely in the area overlapping with the SCH, and the signals falling in the overlapping area follow the previous The analysis was severely interfered by the SCH channel, resulting in too high a bit error in 3.4K signaling, and the link was often dropped

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  • Interleaving method for reducing interference by synchronous channel signal
  • Interleaving method for reducing interference by synchronous channel signal
  • Interleaving method for reducing interference by synchronous channel signal

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Embodiment Construction

[0020] First, analyze the cause of the interference caused by the SCH channel.

[0021] As shown in Figure 2, the flow chart of downlink data framed and sent to the wireless channel, before the data is sent to the wireless channel, after the data from different transmission channels are cascaded and multiplexed through the transmission channel, a second interleaving is required ( 2nd Interleaving) to scramble the mutual order of these data, so as to break up the sudden stacking errors that occur in wireless channel transmission. For details of the second interleaving technology, refer to 3GPP TS25.212V5.4.0, and the following is only a brief introduction.

[0022] The second interleaving process mainly includes: first write the data row by row into a (N×30) matrix, that is, C2=30 according to the protocol. The matrix is ​​then swapped column by column and read out column by column. The internal column exchange rules corresponding to C2=30 are as follows: Suppose the original...

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Abstract

This invention provides a kind of interleaving method for decreasing SCH interference. It is used for second interleaving process of data transmission. It concludes: the need interleaving data are read-in to the interleaving matrix of interleaving machine line by line. The number of columns of the used interleaving matrix C2 meets 15 / C2<15%; the said interleaving matrix are controlled to undertake column exchanging by interleaving machine; the interleaved data are read out from the interleaving matrix column by column. The better C2=120 undertakes column exchanging, which uses the said C2=120 corresponded column exchanging rule. This invention can decrease interference of the SCH channel signal.

Description

technical field [0001] The invention relates to the technical field of wireless channel coding and interleaving, in particular to an interleaving method for reducing the interference of a synchronization channel (SCH) signal. Background technique [0002] In a communication system using WCDMA technology, channels include dedicated channels and common channels, and common channels include common pilot channels and paging channels. The dedicated channels for different user communications and most of the shared channels use the same time period and frequency band. These channels are generally transmitted synchronously, and the downlink channels are distinguished by unrelated "codes", such as orthogonal variable length spread frequency code (OVSF). By using orthogonal codes, the interference between downlink channels is relatively small. [0003] The synchronization channel (SCH) does not use channel codes and scrambling codes for spread spectrum processing, so the cross-corre...

Claims

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Application Information

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IPC IPC(8): H04L1/00H03M13/27H04J13/02
Inventor 蔡华李必涛
Owner HUAWEI TECH CO LTD