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Transmission circuit

A transmission circuit and data transmission technology, applied in the field of transmission circuits, can solve the problem that the power of control channel data DPCCH cannot be kept constant, etc.

Inactive Publication Date: 2002-07-24
LENOVO INNOVATIONS LTD HONG KONG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But in the traditional transmission circuit as mentioned above, the power of the control channel data DPCCH at the antenna end cannot be kept constant, but will vary with the combination of gain factors or the output power of the quadrature modulator

Method used

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Embodiment Construction

[0049] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Several preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0050] Fig. 2 is a block diagram showing the configuration of a transmission circuit according to the first embodiment of the present invention.

[0051]As shown in Figure 2, the first embodiment includes: a baseband circuit 10 for generating and outputting two types of transmission data, namely, data channel data DPDCH (Dedicated Physical Data Channel) as the first channel data and data channel data as the second channel The control channel data DPCCH (Dedicated Physical Control Channel) of the channel data and output gain factors βc, βd, βsc and βsd as values ​​independently weighting the I (in-phase) and Q (quadrature) amplitudes in HPSK modulation and with TPC (Total Power Control) bit used to control the transmission power of the terminal; a multiplier 20 as a spreading device for m...

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Abstract

A transmission circuit includes a baseband circuit, spreading section, multiplier, digital modulator, quadrature modulator, and antenna. The baseband circuit generates and outputs at least one transmission data constituted by first and second channel data. The spreading section spreads the transmission data with a spreading code that differs for each transmission channel. The multiplier respectively weights the amplitudes of the first and second channel data by using a combination of two gain factors determined by a transmission data rate. The digital modulator digitally modulates the first and second channel data whose amplitudes are weighted by the multiplier. The quadrature modulator quadrature-modulates the digitally modulated first and second channel data and outputs the data as a, transmission signal. The antenna emits the transmission signal output from the quadrature modulator as a radio wave. The multiplier weights the amplitudes of the first and second channel data by using gain factors that keep power of the transmission signal output from the quadrature modulator constant regardless of the transmission data rate without changing the ratio of a combination of gain factors determined by the transmission data rate.

Description

technical field [0001] The present invention relates to a transmission circuit configured in a communication terminal, and more particularly, to a transmission circuit using a modulation scheme of HPSK (Hyper Phase Shift Keying). Background technique [0002] In the HPSK modulation scheme described in 3G TS 25.213 of 3GPP (Third Generation Partnership Project), which is a standardization project of the W-CDMA (Wideband Code Division Multiple Access) specification, transmission data is first spread by a spreading code and then spread The transmitted data of is multiplied by a gain factor, and amplitude weighting is performed in HPSK modulation to obtain amplitude data. Thereafter, HPSK modulation is performed on the amplitude data. [0003] FIG. 1 is a block diagram showing an example of the configuration of a conventional transmission circuit using the HPSK modulation scheme. [0004] As shown in Figure 1, the traditional circuit includes: a baseband circuit 110 for genera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/20H04B1/04H04B1/707H04J13/00
CPCH04B2201/70703H04J13/0077H04J13/00H04B1/707
Inventor 栗原和弘
Owner LENOVO INNOVATIONS LTD HONG KONG