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Base station device and method for suppressing peak current

A base station and correction value technology, applied in the direction of gain control, amplification control, modulation carrier system, etc., can solve the problems of circuit scale increase and power consumption increase

Inactive Publication Date: 2001-06-20
PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] That is to say, in order to suppress the transmission amplitude at the time of the peak, the above-mentioned conventional base station has to increase the filter calculation circuit, which has problems of increasing the circuit scale and power consumption.

Method used

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  • Base station device and method for suppressing peak current
  • Base station device and method for suppressing peak current
  • Base station device and method for suppressing peak current

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] figure 2 It is a structural block diagram of the base station in Embodiment 1 of the present invention.

[0032] exist figure 2 Among them, the modulation unit 101 performs QPSK modulation on the transmission signal A to be transmitted to the user A, and outputs the in-phase component and the quadrature component of the modulated signal to the spreading unit 104 . Similarly, modulation unit 102 performs QPSK modulation on transmission signal B to be transmitted to user B, and outputs the in-phase component and quadrature component of the modulated signal to spreading unit 105 . The modulation unit 103 performs QPSK modulation on the transmission signal C to be transmitted to the user C, and outputs the in-phase component and the quadrature component of the modulated signal to the spreading unit 106 .

[0033] The spreading unit 104 multiplies the QPSK-modulated transmission signal A by a unique spreading code to perform spreading processing, and outputs the spread sig...

Embodiment 2

[0065] Figure 4 It is a structural block diagram of the base station in Embodiment 2 of the present invention. exist Figure 4 in, right with figure 2 The same structure is appended with figure 2 The same reference numerals are used, and descriptions thereof are omitted. Figure 4 The base station shown uses a pair of figure 2 The illustrated base station has a structure in which multiplication units 201, 201 and averaging units 203, 204 are added.

[0066] When the amplitude of the transmission signal calculated by the envelope calculation unit 113 exceeds the allowable amplitude value, the correction coefficient calculation unit 114 calculates the difference in amplitude of the transmission signal before and after the time, and compares the absolute value of the difference with a preset threshold value. Size comparison, when the absolute value of the difference does not exceed the threshold value, calculate the correction coefficient for each transmission signal, outpu...

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Abstract

An envelope calculation section 113 calculates the amplitude of a transmission signal after the multiplexing thereof. When the calculated amplitude is beyond a permissible amplitude value, a correction coefficient calculation section 114 calculates a correction coefficient that is the difference between amplitude values before and after a correction. Multiplication sections 115 and 116 calculate a correction value by multiplying a filter coefficient by a correction coefficient. Subtraction sections 119 and 120 subtract the correction value from the transmission signal after a filtering operation. Thereby, the transmission amplitude at the time of a peak can be suppressed without increasing the number of filter operation circuits.

Description

technical field [0001] The invention relates to a base station device and a peak power suppressing method of cellular systems such as car phones and portable phones. Background technique [0002] In recent years, a cellular system such as a car phone and a mobile phone whose demand has increased rapidly is a system in which a base station is installed in the center of each cell, and the base station and one or more communication terminals in the cell simultaneously perform wireless communication through multiple access. [0003] The CDMA (Code Division Multiple Access) method as one of the multiple access methods is as follows: at the transmitting end, the signal obtained by multiplying the modulated information data by a spreading code and spreading to a wide band is transmitted, and at the receiving end, the At the same timing as the sending end, the received signal is multiplied by the same spreading code as that of the sending end for despreading, and the information dat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/20H03G3/30H04B7/26H04J13/00H04L5/02H04L27/26H04W88/02
CPCH04L5/026H04L27/2614H04L5/02H04B2201/70706H03G3/3042
Inventor 平松胜彦
Owner PANASONIC INTELLECTUAL PROPERTY CORP OF AMERICA
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