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Power control method applicable to Raptor Codes under additive white Gaussian noise channel

A technology of power control and noise channel, which is applied in the power control field of Raptor Codes, and can solve the problem of not being suitable for AWGN channel, etc.

Active Publication Date: 2011-11-16
ZHEJIANG UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0005] Rateless Codes initially attracted high attention for its excellent performance on delete-and-delete channels (see "LTCodes", Proceedings of the 43rd Annual IEEE Symposium on foundation of Computer Science), but it is not suitable for AWGN channels

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  • Power control method applicable to Raptor Codes under additive white Gaussian noise channel
  • Power control method applicable to Raptor Codes under additive white Gaussian noise channel
  • Power control method applicable to Raptor Codes under additive white Gaussian noise channel

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Embodiment

[0088] A power control method suitable for Raptor Codes under the AWGN channel, including a coding method and a decoding method combined with power control;

[0089] The coding method combined with power control is as follows:

[0090] 1) Assuming that the sender wants to send m=1900 message data packets, each packet contains several data bits, and includes a cyclic redundancy check code, and this cyclic redundancy check code adopts CRC16 for decoding The basis for the device to judge whether the decoding is successful. use s j Indicates the message data packet, the subscript j is the number of the message data packet, j=1, 2, ..., 1900, the encoding sending end adopts Raptor Codes for encoding, and the Raptor Codes is made of high code rate LDPC Codes as the outer code, and Cascaded LT Codes composed of a l Represents the precoded packet generated after the message data packet is encoded by LDPC, l=1, 2,..., 2000, with t i Indicates the encoded packets generated after enc...

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Abstract

The invention discloses a power control method applicable to Raptor Codes under an additive white Gaussian noise channel. In the power control method, by utilizing the self-adaptive link fitting characteristic of the Raptor Codes, on the premise of constant total transmitting energy, if a transmitting end reduces the transmitting power and increases the code length, the difference value between the capacity C and code rate R of the channel can be increased, so that the performance of the Raptor Codes is obviously improved. By utilizing the characteristic of the Raptor Codes, the transmitting power can be controlled by the transmitting end so as to meet the requirement of the current channel. For channels with higher requirements for the transmission time, the transmitting power can be increased as high as possible on the premise of meeting the total transmitting energy so as to reduce the transmission time; and for channels with higher requirements for the transmission energy consumption, the transmitting power can be reduced as low as possible on the premise of meeting the maximum transmission time so as to reduce the total transmission energy.

Description

technical field [0001] The invention relates to the field of wireless communication, in particular to a power control method suitable for Raptor Codes under an additive white Gaussian noise channel. Background technique [0002] Traditional channel coding usually uses fixed-rate linear block codes, such as LDPC codes and RA codes. Firstly, channel parameters need to be estimated through channel state information (CSI), and a (N, M) block code with a fixed code rate R=N / M should be designed accordingly. Due to the error between the estimated channel parameters and the actual channel parameters, when the estimated value is greater than the actual value, although the block code designed according to the estimated value can achieve the reliability of transmission, it will cause a waste of resources, because a higher code rate can be used. linear block code; when the estimated value is smaller than the actual value, the reliability of transmission cannot be guaranteed, and a lin...

Claims

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Application Information

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IPC IPC(8): H04W52/04H04L1/00
Inventor 彭瑶张朝阳
Owner ZHEJIANG UNIV
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