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Channel quality information based self-adaptive interleaving method and device

A technology of channel quality information and quality information, which is applied in the field of wireless communication and can solve problems such as receiving data burst errors

Active Publication Date: 2015-06-17
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the OFDM system, the data information is modulated in the frequency domain and transmitted through the frequency domain channel, and the frequency domain channel has the characteristics of selective fading. In the coherent band block, adjacent subcarriers are likely to be in a deep fading state at the same time, so Burst errors causing received data

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  • Channel quality information based self-adaptive interleaving method and device
  • Channel quality information based self-adaptive interleaving method and device
  • Channel quality information based self-adaptive interleaving method and device

Examples

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Embodiment 1

[0051] Such as figure 1 As shown, consider such an OFDM-MIMO communication system, the channel code is Low Density Parity Check Code (Low Density Parity Check Code, LDPC), the modulation method is 16QAM, the OFDM system uses 16 subcarriers, one spatial stream, and an automatic A symbol interleaving method adapted to channel quality information, comprising the following steps:

[0052] Step 1: The sender sends a channel quality information (Channel Quality Information, CQI) request frame and sends an empty data frame;

[0053] Step 2: After receiving the request information, the receiving end estimates the CQI through the empty data frame. The calculation formula of the CQI is:

[0054] CQI k = SNR k = S k I + N (Formula 1)

[0055] CQI in Equation 1 k Indicates the ...

Embodiment 2

[0098] Embodiment 1 is a theoretical analysis, and Embodiment 2 mainly takes the OFDM system of IEEE 802.11aj (45 GHz) as an example, and uses the method of system simulation to illustrate the performance of the packet error rate of the present invention in a specific wireless communication system. The IEEE 802.11aj (45GHz) standard supports two bandwidths of 540MHz and 1080MHz, the corresponding numbers of data subcarriers are 168 and 336, and the maximum number of spatial data streams is 4. In addition, the receiving end adopts MMSE receiver, and the channel estimation is an ideal channel estimation. See Table 3 for other parameters. In this embodiment, it is stipulated that an adaptive interleaving algorithm based on channel quality information feeds back a CQI once per frame, and then updates the interleaving pair set P and the deinterleaving pair set P' accordingly. See Table 4 for the interleaving parameters of the traditional interleaving method specified by the IEEE 80...

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Abstract

The invention discloses a channel quality information based self-adaptive interleaving method. The channel quality information based self-adaptive interleaving method comprises the steps that a receiving terminal performs channel quality information estimation and conducts state classification and feedback on sub-carrier waves according to CQI; then a transmitting terminal and the receiving terminal respectively determine interleaving depth and interleaving rules according to the state classification and feedback of the sub-carrier waves and perform interleaving and de-interleaving according to the rules. The invention further provides a self-adaptive interleaving device adopting the method. The self-adaptive interleaving device specially comprises an interleaving depth calculating module, an interleaving rule determination module and an interleaving module of the transmitting terminal and a channel quality information estimation module, a sub-carrier wave state calculation module, an interleaving depth calculating module, a de-interleaving rule determination module and a de-interleaving module of the receiving terminal. The channel quality information based self-adaptive interleaving method and device can complete self-adaptive interleaving and de-interleaving under the situation that a small amount of information is fed back, the problem that traditional interleaving is not suitable for changing channels is effectively solved, the packet error rate of a system is wholly reduced, and the performance of the system is improved.

Description

technical field [0001] The invention relates to an adaptive interleaving method and device based on channel quality information, belonging to the technical field of wireless communication. Background technique [0002] There are two types of errors in wireless communication systems: one is called random errors, which are caused by noise; the other is called burst errors, which are caused by channel fading, interference and system configuration errors. Forward error correction codes, including Low Density Parity Check Code (LDPC) and Binary Convolution Code (Binary Convolution Code, BCC), are common channels used in wireless communication systems to detect and correct system errors coding. However, the ability of FEC codes to correct burst errors is limited. Therefore, it is necessary to discretely randomize burst errors through interleaving technology to form discrete errors, so as to correct these errors at the receiving end and improve system performance. [0003] At pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L1/00H04L27/26
Inventor 杨绿溪李长庚魏明君陈峰王雅芳
Owner SOUTHEAST UNIV