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Simplified characterization method for channel quality feedback information

An information volume and channel technology, applied in the field of reducing the feedback information volume of the channel, can solve the problem of a large amount of feedback information, and achieve the effect of reducing overhead

Inactive Publication Date: 2009-09-02
SHANGHAI JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In these methods, the base station needs to obtain the frequency domain transmission characteristics of the channel quality, and these characteristics are obtained by feedback in units of subcarrier blocks in the frequency domain of the OFDM system. The disadvantage is that the subcarrier blocks that users participate in adaptive processing The more, the more feedback information is required

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  • Simplified characterization method for channel quality feedback information
  • Simplified characterization method for channel quality feedback information
  • Simplified characterization method for channel quality feedback information

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Embodiment Construction

[0019] The invention utilizes the quasi-static characteristic of the channel transfer function, and uses the multipath taps in the time domain to characterize the channel quality information in the entire frequency domain. First, classify the channel transfer function results obtained by the controlled end through a certain reference signal. The two cases are: frequency domain channel impulse response H(k) and time domain channel impulse response h(n). For the channel impulse response in the frequency domain, IFFT transform is performed on it to obtain the time domain channel impulse response h(n); for the channel impulse response in the time domain, the subsequent operations are directly entered. Determine the number of multipaths J for feedback according to the power percentage coefficient η, which satisfies

[0020] J = arg min 0 J ≤ ...

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Abstract

A method for reducing the amount of feedback information of a channel belongs to the technical field of communication. When performing channel quality feedback between communication terminals, the present invention uses quasi-static characteristics in channel transmission characteristics to represent channel quality information in the entire frequency domain with multipath taps in the time domain; at the same time, through the adjustment of the power percentage coefficient To achieve the purpose of controlling the feedback accuracy and the amount of feedback data to adapt to changes in the number of system users and resource occupancy. Compared with the prior art, the present invention only needs to feed back channel information proportional to the number of multipaths, and can adjust the number of multipaths to be fed back through the power percentage coefficient, thereby reducing the amount of feedback information.

Description

technical field [0001] The present invention relates to a method in the technical field of communications, and in particular to a method for reducing the amount of feedback information of a channel in a wideband OFDM system. Background technique [0002] With the continuous development of wireless transmission technology, the types of wireless data services continue to increase, including wireless Internet, wireless video transmission, VoIP, etc., all of which put forward higher requirements for the transmission rate of wireless data. To meet the above requirements, high-speed wireless with Channel Quality Information Measurement and feedback is used in both cdma2000 systems (1xEV-DV and 1x-EV-Do) and HighSpeed ​​Downlink Packet Data Access (HSPDA) systems. data transmission technology. This technology firstly detects the transmission quality of the wireless channel at the controlled end, and then feeds the information back to the control end for wireless resource allocatio...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L29/00H04L27/26
Inventor 甘小莺牟大维徐友云张海滨
Owner SHANGHAI JIAOTONG UNIV