pr_ask modulation method based on fpga
A modulation method and a technology for transmitting signals, which are applied in the field of radio frequency identification, can solve problems such as inability to effectively wake up tags and affect tag inventory capabilities, and achieve the effects of optimizing channel utilization, reducing pulse width, and reducing channel bandwidth
Active Publication Date: 2019-06-07
CHENGDU JIUZHOU ELECTRONIC INFORMATION SYSTEM CO LTD
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Problems solved by technology
However, in the existing design of the reader, the implementation of PR_ASK encoding is often used. Due to the limitation of the short delimiter signal, the tag cannot be effectively awakened, which affects the tag inventory capability.
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[0022] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0023] Such as figure 1 Shown is a schematic flow chart of the FPGA-based PR_ASK modulation method of the present invention. A kind of PR_ASK modulation method based on FPGA, comprises the following steps:
[0024] A. Determine the content of the transmitted signal according to the transmission command of the host computer;
[0025] B. Carry out PIE encoding to the transmitted signal in step A according to the PIE encoding mode;
[0026] C. Carry out PR_ASK modulation and shaping to the transmitted signal after PIE encoding in step B;
[0027] D. Carry out digital quantization to the transmitte...
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The invention discloses a PR_ASK modulation method based on an FPGA. The method comprises the steps of determining transmitting signal content; carrying out PIE coding; carrying out PR_ASK modulation shaping; carrying out digital quantification; carrying out baseband filtering; carrying out digital-to-analogue conversion; and carrying out carrier modulation. According to the method, a transmitting signal is modulated through adoption of a PR_ASK modulation mode; a pulse width of a low-energy signal is greatly reduced, equivalently, energy of a sending tag is improved, and the tag can receive more energy at the further distance; moreover, the modulation depth can reach a level of more than 90% easily; the working distance between a reader / writer and the tag is prolonged, moreover, a channel occupation bandwidth of the signal can be effectively reduced; a channel utilization rate is optimized; the interference of other electromagnetic signals in the air is eliminated; and moreover, the other signals cannot be influenced.
Description
technical field [0001] The invention belongs to the technical field of radio frequency identification, in particular to an FPGA-based PR_ASK modulation method. Background technique [0002] In the radio frequency identification (RFID) technology, since the passive tag does not have a battery, it needs to rely on the carrier energy sent by the UHF reader to work. Therefore, when the reader-writer communicates with the tag, the more sufficient the carrier energy provided by the reader-writer, the clearer the signal received by the tag, and the better the effect of returning the tag signal. Under the same transmission power, the better the transmission signal received by the tag, the farther the distance of the tag returning signal, which means the longer the interaction distance between the tag and the reader. In the ISO / IEC 18000-6C protocol, three kinds of content about the modulation of the transmitted signal are mentioned, namely DSB_ASK, SSB_ASK and PR_ASK. Among them, ...
Claims
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IPC IPC(8): H04L27/04G06K7/00
CPCG06K7/0008H04L27/04
Inventor 许志伟谢箭贺文娟
Owner CHENGDU JIUZHOU ELECTRONIC INFORMATION SYSTEM CO LTD