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Code multi-way multiplex transmission device

A technology for multiplexing and transmitting devices, applied in the field of coding multiplexing transmitting devices, can solve the problems of power amplifier power efficiency decline and the like

Inactive Publication Date: 2003-04-30
FUJITSU LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the average power level of the input signal that has just been reduced is used, there will be a problem that the power efficiency of the power amplifier will drop

Method used

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  • Code multi-way multiplex transmission device
  • Code multi-way multiplex transmission device
  • Code multi-way multiplex transmission device

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0083] figure 2 is a diagram illustrating the structure of a code multiplexing transmitter based on the first embodiment of the present invention, such as a base station used in mobile wireless communication. This is an example for the case where QPSK is used as normal narrowband modulation.

[0084] Such as figure 2 As shown, the spread spectrum modulation unit 51 of the first to nth channels 1 ~51 n Each includes a frame generator 61 that generates a frame signal by inserting a pilot signal into the transmission data every predetermined number of items, and a serial / parallel converter 62 that converts the frame data into parallel data to generate extended Code C i (i=1, 2..., n) extension code generator 63, with extension code C i A spread spectrum modulator circuit 64 that spread spectrum modulates the frame data, and a phase shifter 65 that shifts the phase of the signal point position vector of the spread spectrum modulated signal by a predetermined angle θ for eac...

no. 2 example

[0101] Figure 8 is a diagram illustrating the structure of a code multiplexing transmitter based on the second embodiment of the present invention. This is an example for the case where QPSK modulation is used for normal narrowband modulation. are denoted with similar index letters as figure 2 The same elements are shown in the first embodiment.

[0102] The first embodiment relates to the case of rotating the phases of signal point position vectors of all transmission data and pilot signals in a code multiplexed signal. In the second embodiment, only the signal point position vector of the pilot signal is rotated.

[0103] Figure 8 The second embodiment of figure 2 The first example differs in that

[0104] (1) The pilot generator 61b inputs the pilot position signal PPS indicating the time delay of the pilot signal to the phase shifter 65, and

[0105] (2) The phase shifter 65 performs phase rotation control when the pilot position signal PPS is at a high level, t...

no. 3 example

[0112] In the first and second embodiments, the phase shift amount is calculated according to equation (1) or equation (4). In the third embodiment, there is a 1:1 correspondence between the phase offset and the orthogonal Gold code (short code), and the phase offset consistent with the orthogonal Gold code used in spread spectrum modulation is obtained, And the phase of the signal point position vector is shifted by the phase shift amount.

[0113] Figure 12 is a diagram illustrating the structure of a code multiplexing transmitter based on the third embodiment of the present invention. are denoted with similar index letters as figure 2 The same elements are shown in the first embodiment. Figure 12 The third embodiment of figure 2 The first example differs in that

[0114] (1) provide the pilot phase information storage table 66 and store the correspondence table between the orthogonal Gold code identification number and the pilot phase offset,

[0115] (2) The phas...

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PUM

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Abstract

A code multiplexing transmitting apparatus spread-spectrum modulates transmission data of a plurality of channels by spreading codes that differ from one another, combines the spread-spectrum signals of each of the channels and transmits the resultant spread-spectrum modulated signal. A spread-spectrum modulating unit for each channel includes a phase shifter for shifting, by a predetermined angle channel by channel, the phase of a position vector of the spread-spectrum modulated signal of each channel. As the result of such phase control, the phases of pilot signal portions of the spread-spectrum modulated signals of the respective channels are shifted relative to one another so that the peak values of the code-multiplexed signal can be suppressed.

Description

technical field [0001] The present invention relates to a coded multiplexing transmission device, and more specifically, to a method for separately performing spread spectrum modulation on signals of a plurality of channels by using different codes, mixing the spread spectrum modulated signals of each channel and transmitting the obtained A code multiplexing transmission device for a spread spectrum modulated signal. technical background [0002] Wireless addressing using CDMA (Code Division Multiple Access) has been developed and will be used as a next-generation digital mobile communication technology. CDMA is a multiple access method that uses spread spectrum communication. Specifically, the transmission information of multiple channels or users is multiplexed by encoding and transmitted on a transmission path such as a wireless link. [0003] Spread spectrum communication is a modulation method, which is different from general narrowband modulation. In spread spectrum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L27/20H04B1/707H04B1/7097H04J13/00H04J13/12
CPCH04J13/0051H04J13/00H04B2201/70701H04J13/12H04B2201/70706H04B1/707H04B1/7075
Inventor 长谷和男大石泰之福政英伸浜田一浅野贤彦
Owner FUJITSU LTD
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