Low-density parity check code-based adaptive modulation and coding method

A low-density parity and adaptive modulation technology, which is applied to baseband system components, digital transmission systems, electrical components, etc., can solve problems such as high system complexity

Inactive Publication Date: 2011-06-15
SHANGHAI HUAHONG INTEGRATED CIRCUIT
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Problems solved by technology

However, the larger the number of modulation and co

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  • Low-density parity check code-based adaptive modulation and coding method
  • Low-density parity check code-based adaptive modulation and coding method
  • Low-density parity check code-based adaptive modulation and coding method

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[0037] specific implementation plan

[0038] Below in conjunction with each accompanying drawing, a kind of low-density parity-check code based adaptive modulation coding implementation method provided by the present invention is further described:

[0039] The transmitted signal is encoded by a double-code rate low-density parity-check code and modulated by a dual-mode in the transmitter part, and then sent to the wireless channel through the radio frequency transmitting module. According to the feedback information of the receiver, switch the low-density parity-check code coding mode, switch the modulation mode, and select one of the two MCS selection algorithms according to the system requirements. The received signal is frequency-converted into a baseband signal or an intermediate frequency signal by the radio frequency receiving module, and the signal is detected, dual-mode demodulation, and the dual-rate low-density parity-check code is decoded and output. Channel evalu...

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Abstract

The invention discloses a low-density parity check code-based adaptive modulation and coding method. The method comprises the following steps of: transmitting a transmitted signal into a wireless channel by using a radio frequency transmitting module after performing dual-code rate low-density parity check code coding and dual-mode modulation in a transmitter part; according to feedback information of a receiver, switching a low-density parity check code coding mode and a modulation mode, and selecting one of two modulation and coding scheme (MCS) selection algorithms according to system requirements; performing frequency-conversion on a received signal to obtain a baseband signal or an intermediate frequency signal by using a radio frequency receiving module, and outputting the baseband signal or the intermediate frequency signal after performing signal detection, the dual-mode modulation and the dual-code rate low-density parity check code coding; and performing channel estimation according to the received signal, feeding a channel estimation result back to the transmitter, and simultaneously switching the low-density parity check code coding mode and switching the modulation mode. The method can improve the efficiency of a data transmission bandwidth remarkably and realize the balance between transmission performance and technology realizing complexity.

Description

technical field [0001] The invention relates to a coding method in the communication field, in particular to an adaptive modulation and coding method based on a low-density parity check code. Background technique [0002] In a wireless communication system, channels are affected by factors such as shadow fading, multipath fading, path loss, and various interferences. Channel characteristics and interference conditions are constantly changing over time. The traditional transmission technology is designed for the worst channel conditions, using methods such as increasing the transmit power of the transmitter, reducing the modulation order, and increasing the redundancy of error correction codes to ensure that it can be achieved in various states of time-varying channels. scheduled performance. Although this strategy can guarantee the communication quality, the bandwidth efficiency is very low, resulting in that the channel capacity cannot be fully utilized. [0003] With th...

Claims

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Application Information

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IPC IPC(8): H04L1/00H04L25/02
Inventor 李刚
Owner SHANGHAI HUAHONG INTEGRATED CIRCUIT
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