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Coding for Inductively Coupled Channels

机译:电感耦合通道的编码

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摘要

Inductive coupling is a technique wherein one device (the reader) induces an electrical current in another device (the tag), thereby providing not only power for the tag, but also a communication channel. In this paper, we focus exclusively on the reader-to-tag channel. The first part of this paper presents modulation codes that possess a high minimum and a high average power. This is important, since the tag gets its entire power from the received signal, and the information should be modulated in a way that maximizes the power transferred to the tag. The presented modulation codes compare favorably to codes used in radio frequency identification applications today. The second part of the paper describes modulation codes with some error-correcting capabilities. In fact, most errors in the reader-to-tag channel are due to incorrect timing. Here, we propose to model the timing errors in the reader-to-tag communication channel by a simple bit-shift channel, and we will present optimal (in the sense of maximizing the code rate for a given block length) single bit-shift error-correcting codes for this simple bit-shift channel that also have large average power.
机译:感应耦合是一种技术,其中一个设备(读取器)在另一设备(标签)中感应出电流,从而不仅为标签提供功率,而且还提供通信通道。在本文中,我们仅关注阅读器到标签的通道。本文的第一部分介绍了具有高最小值和高平均功率的调制码。这很重要,因为标签会从接收到的信号中获取全部功率,并且应该以最大化传递到标签的功率的方式来调制信息。所提供的调制代码与当今射频识别应用中使用的代码相比具有优势。本文的第二部分描述了具有某些纠错功能的调制码。实际上,阅读器到标签通道中的大多数错误是由于不正确的计时所致。在这里,我们建议通过一个简单的位移位来对读取器到标签通信通道中的时序误差进行建模,并且我们将给出最佳的(就给定块长度而言最大化编码率的意义)一次位移位这个简单的位移通道的纠错码也具有很大的平均功率。

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