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LPWAN communication protocol design with Turbo codes

A convolutional code and concatenated technology, applied in wireless communication, error detection by signal space coding, error correction/detection using block code, etc., can solve problems such as long decoding delay

Pending Publication Date: 2021-09-07
星盟国际有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Furthermore, for many applications it is not uncommon to find that more than 10 decoding iterations are required in order to achieve an acceptable bit error rate, resulting in long decoding latencies

Method used

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  • LPWAN communication protocol design with Turbo codes
  • LPWAN communication protocol design with Turbo codes
  • LPWAN communication protocol design with Turbo codes

Examples

Experimental program
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Embodiment Construction

[0049] Certain coding schemes, such as parallel concatenated convolutional codes, do not have error detection capabilities. The present invention provides error detection capabilities to communication schemes based on parallel concatenated convolutional codes.

[0050] According to one embodiment of the invention, an indicator may be devised which, when evaluated from the received modulated signal, may be used to determine a certain level of confidence that the transmitted signal was correctly received. For example, for the ith bit of the transmitted message block, suppose the analog value Y i is the analog value modulated from X i (which can be -1.0 or +1.0, inclusive) Received. The modulation may be, for example, CDMA with a joint phase shift keying modulation scheme. For a Gaussian channel, the received signal Y i Offset send value X i The probability of the mean of , P(Y i -X i |X i ) has a Gaussian distribution, which can be obtained empirically. Also, for binary...

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PUM

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Abstract

A method and a decoder for receiving a message encoded in Turbo Codes and modulated for transmission as an analog signal includes: (a) demodulating the analog signal to recover the Turbo Codes; and (b) decoding the Turbo Codes to recover the message using an iterative Turbo Code decoder, wherein the decoding includes performing an error detection after a predetermined number of iterations of the Turbo Code decoder to determine whether or not an error has occurred during the transmission. The predetermined number of iterations may be, for example, two. Depending on the result of the error detection, the decoding may stop, a request for retransmission of the message may be sent, or further iterations of decoding in the Turbo Code decoder may be carried out.

Description

technical field [0001] The present invention relates to communication protocols. In particular, the present invention relates to communication protocols suitable for use in wireless communication applications such as Low Power Wide Area Networks (LPWAN). Background technique [0002] figure 1 A model 100 of a communication system is shown. Such as figure 1 As shown in , binary data 101 is encoded in step 102 into a sequence of binary codewords. Examples of codes include error detection codes, error correction codes, and parallel concatenated convolutional codes (Turbocodes). In the detailed description that follows, the invention is exemplified using coding schemes using parallel concatenated convolutional codes or any of several selected types of error detecting codes. The encoded sequence of binary codewords is modulated at step 103 onto a carrier signal for transmission at step 104 . An example of a modulation scheme may be Code Division Multiple Access (CDMA) combi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W8/00H04W24/00H04W72/04
CPCH03M13/09H03M13/2975H03M13/6306H03M13/258H03M13/2963H03M13/098H03M13/617H04L1/0059H04L1/0061
Inventor W.涂W.华
Owner 星盟国际有限公司