An orthogonal range modulation and demodulation method and device for communication system

A quadrature amplitude modulation and communication system technology, applied in the field of communication, can solve the problems of reduced network data transmission efficiency and demodulation operation data transmission efficiency.

Active Publication Date: 2008-01-09
ST ERICSSON SEMICON BEIJING
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method and device for quadrature amplitude modulation and demodulation applied to a communication system, which solves the problem of a sharp increase in the block error r

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  • An orthogonal range modulation and demodulation method and device for communication system
  • An orthogonal range modulation and demodulation method and device for communication system
  • An orthogonal range modulation and demodulation method and device for communication system

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[0076] In order to make the purpose, technical solution and implementation effect of the present invention clearer, the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0077] The present invention provides a method and device for quadrature amplitude modulation and demodulation in a communication system. The demodulation method and device can be widely used in different communication technologies in the communication field. The TD-SCDMA standard in the mobile communication field is used below The 16QAM used in is an example to describe the specific technical solution of the present invention. Table 1 is the 16QAM constellation map mapping relationship defined in the 3GPP R5 25.223 protocol. Every 4 bits corresponds to a symbol, where the symbol is a symbol in complex form. The real part of the symbol is also called I way, and the imaginary part is also called Q way: express ...

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Abstract

The method comprises: 1) the receiving end uses the constellation diagram to make the mapping for the received signals to get the final symbol, and makes the final symbol saturation operation for the final symbol; 2) confirming each level of preset threshold of soft bits demodulation modulated by M-ary of orthogonal amplitude modulation; according to the final symbol after confirming the threshold and completing the saturation operation, calculating each bit of the final symbol. The invention solves the issue of low data transmission efficiency caused by the increasing of block-missed rate at receiving end and by making complex calculation at receiving end.

Description

technical field [0001] The present invention relates to demodulation technology in the communication field, in particular to a method and device for quadrature amplitude modulation and demodulation applied to communication systems. Background technique [0002] With the rapid development of communication technology, people need to transmit more information on the limited communication network bandwidth. In terms of communication modulation methods, Quadrature Amplitude Modulation (QAM, Quadrature Amplitude Modulation) is closer to the limit of channel capacity than other modulation methods when the bandwidth is limited. That is to say, in the same bandwidth and transmission Under low power, QAM has higher transmission efficiency. [0003] Based on the above reasons, in high-speed data transmission, such as wireless network communication such as WiMAX (Worldwide Interoperability for Microwave Access), satellite communication, optical cable communication, or in different stan...

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Application Information

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IPC IPC(8): H04L27/34H04L27/38
Inventor 李燮
Owner ST ERICSSON SEMICON BEIJING
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