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Methods and devices for dynamic quantizing input of a soft decision decoder

A quantizer and dynamic technology, applied in equalizers, transmission systems, digital transmission systems, etc., can solve the problems of high computational complexity and increased decoder complexity, and achieve the effect of reducing power loss

Inactive Publication Date: 2006-01-18
BENQ CORP
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Problems solved by technology

Usually, the SNR obtained by soft-decision decoding is 2-3dB higher than that obtained by hard-decision decoding. However, since the soft-decision decoder needs to process soft sampling values, its calculation amount is more than that of the hard-decision decoder, which makes the decoder more complex. improvement

Method used

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  • Methods and devices for dynamic quantizing input of a soft decision decoder
  • Methods and devices for dynamic quantizing input of a soft decision decoder
  • Methods and devices for dynamic quantizing input of a soft decision decoder

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Embodiment Construction

[0040]FIG. 2 is a structural diagram of a receiver in a wireless communication system according to the present invention. The receiver in Fig. 2 is similar to that in Fig. 1, except for a dynamic quantizer 25 connected to a SOVA equalizer 23 and a soft Viterbi decoder 26. As shown in FIG. 1 , the existing quantizer 15 does not change the number of quantization levels according to the channel state, resulting in wasting too many resources to process these signals when the channel state is good. The Viterbi decoder 16 therefore has to handle many unnecessary operations and consumes a lot of power. The dynamic quantizer 25 changes the number of quantization levels according to channel conditions. When the channel condition is good, in order to reduce the decoding operation load of the soft Viterbi decoder 26, less quantization bits can be allocated to represent the equalization result during the quantization process. When the channel condition becomes worse, it can also be repl...

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Abstract

Dynamic quantization methods and dynamic quantizers for quantizing soft outputs of an equalizer according to the channel condition in order to alleviate the computational load on a soft decision decoder. The dynamic quantizer assigns only a few bits to represent the equalized signals when the channel condition is good, thus reducing computational burden on the soft decision decoder.

Description

technical field [0001] The present invention relates to a dynamic quantization, in particular to a dynamic quantization input method suitable for a soft decision decoder. Background technique [0002] The purpose of a communication system is to transmit data-carrying signals from two distant transmitters to a receiver through a communication channel. Figure 1 is a block diagram depicting a conventional receiver in a digital communication system. The signal must be modulated from the original frequency range to a frequency range suitable for transmission in the air medium, so the receiver must include a demodulator to demodulate the received signal to restore it to the original frequency range. As shown in FIG. 1 , the signal received from the antenna 11 will first be sent to the channel demodulator 12 for demodulation. After receiving the demodulated signal from the demodulator 12 , a Soft Output Viterbi Algorithm (SOVA) equalizer (SOVA) 13 performs signal equalization ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L27/01
CPCH04L25/03286H04L25/067H04L25/03292H04L25/03318
Inventor 蔡益元陈宏义
Owner BENQ CORP
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