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Controlling device for digital pulse formed filter output gain

A technology of shaping filter and output gain, applied to shaping network in transmitter/receiver, line failure/interference reduction, baseband system components, etc., can solve problems such as large chip area, reduce chip area, avoid Effects of passing invalid bits

Inactive Publication Date: 2008-02-27
ST ERICSSON SEMICON BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Therefore, the gain control in the prior art has the disadvantage of requiring a large storage space to store intermediate data and calculation results, resulting in a large chip area
[0006] In addition, there is noise filtering in addition to the adjacent channel interference, but because the noise is weaker than the signal, it is not considered as the main consideration in the analysis, but its effect can still be included in the adjacent channel interference

Method used

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  • Controlling device for digital pulse formed filter output gain
  • Controlling device for digital pulse formed filter output gain
  • Controlling device for digital pulse formed filter output gain

Examples

Experimental program
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Embodiment Construction

[0019] In order to reduce the chip area, first analyze from the following two aspects:

[0020] On the one hand, in a certain functional operation module, the following operation is set

[0021] Y = Σ n = 1 N X 2

[0022] Wherein, X is the data obtained from the output of RRC, and Y is a variable of this function module. For the sake of simple description, if X∈[-1, 1) represents a sign bit with fixed-point data of Q+1 bit. As shown in Table 1, it is the output description of the RRC filter.

[0023] Table 1

[0024] sign bit

invalid bit

invalid bit

Significant bit

Significant bit

Significant bit

Significant bit

…

[0025] sign bit

invalid bit

invalid bit

invalid bit

invalid bit

Significant bit

Significant bit

…

[0026] The mathe...

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Abstract

This invention relates to a wireless communication system, especially relates to a device for controlling output gain to RRC digital filters in TD-SCDMA system including an output gain device selecting the effective position necessary for adaptive adjust. The automatic control is set up on the basis of wireless frames which predicts power of O-next frame or time slot by computing power or amplitude of a certain time slot of frames of the current or before then to design again for next frame.

Description

technical field [0001] The present invention relates to a wireless communication system, in particular to a device for controlling the output gain of an RRC (root-raised cosine) digital filter in a TD-SCDMA system (time division synchronous code division multiple access of a mobile communication system). Background technique [0002] With the development and popularization of wireless communication, the number of mobile communication users is increasing exponentially, especially the mobile users in China have been growing at a rate of more than 150% in recent years. Users have higher and higher requirements for communication speed and quality. [0003] In a wireless communication system, the rapidly fading wireless transmission channel is very serious for signal degradation. For digital receivers, AGC (Automatic Gain Control) can suppress fading and make the received baseband signal relatively stable. However, in digital receivers, especially in the second generation (2G) a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L25/03H04L25/08
Inventor 董霄剑
Owner ST ERICSSON SEMICON BEIJING