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Bit processing method for self adaptive multispeed modulation

A technology of multi-rate and modulation scheme, applied in modulation carrier system, adjustment of transmission rate, communication between multiple stations, etc., can solve the problems of complex implementation algorithm and incompatibility of systems.

Inactive Publication Date: 2004-05-26
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The above DTX bit processing method has a disadvantage in that it is not compatible with currently developed systems since it requires modification of current multiplexing schemes
Also, it is complex to implement algorithms where DTX bits are grouped in a symbol to map to the origin, or 2 bits are inserted into each data symbol to transmit using only four symbol points on the IQ plane

Method used

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  • Bit processing method for self adaptive multispeed modulation
  • Bit processing method for self adaptive multispeed modulation
  • Bit processing method for self adaptive multispeed modulation

Examples

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Embodiment Construction

[0026] refer to image 3 , the transmitter of the base station modem includes: a transport channel (TrCH) multiplexer 10 for multiplexing radio frames from each TrCH into a synthetic transport channel (CC TrCH); a DTX insertion module 20 for inserting DTX bits into the radio frame of the CCTrCH; a physical channel segmentation module 30 for segmenting the CCTrCH to different physical channels (PhCH); an interleaver 40 for interleaving the segmentation; and a PhCH mapping module 50, Used to map this segment to the corresponding PhCH.

[0027] Figure 4A is a typical 16-QAM constellation diagram, while Figure 4B is a constellation diagram for illustrating how to map symbols with DTX bits on the IQ plane according to the present invention. Such as Figure 4A As shown, for example, 4 bits are allocated to determine symbols in 16-QAM (of course, 6 bits would be allocated in 64-QAM). Therefore, one of four DTX bits can be allocated to a symbol.

[0028] In MQAM multi-rate mod...

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Abstract

A discontinuous transmission (DTX) bit processing method for a multirate modulation scheme is provided. The method comprises receiving a symbol; determining whether the symbol comprises at least one DTX bit; mapping the symbol to a predetermined mapping point (S) on an IQ plane; minimizing a transmission power level if the symbol has at least one DTX bit; and transmitting the symbol in the transmission power level of the mapping point.

Description

technical field [0001] The present invention relates to wireless communication systems, and more particularly to discontinuous transmission (DTX) bit processing methods for adaptive multi-rate modulation. Background technique [0002] With the emergence of the information society, the service center in the telecommunications field has shifted from low-speed voice communication services to multimedia services that provide audio, video, and voice communications. In order to support multimedia services requiring high-speed data transmission, it is critical to maximize channel capacity by effectively utilizing limited resources such as power and frequency bands. [0003] In order to efficiently utilize limited resources, various modulation techniques have been developed. In the case of a wired network, channel characteristics are stable so that highly efficient QAM modulation / demodulation techniques are widely used. In general, wireless networks are unstable compared to finite...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/34H04B7/26H04L1/00H04L25/49
CPCH04L1/0003Y02B60/31H04L27/3411Y02D30/50H04L25/49
Inventor 洪性权
Owner LG ELECTRONICS INC