An FPGA-based Transceiver for Human Body Channel Communication using Walsh Codes

• Main Authors: Chang, Ru-Hua, 張茹華
• Other Authors: Chung, Ching-Che
• Format: Others
• Language: en_US
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/3u6dn3

碩士 === 國立中正大學 === 資訊工程研究所 === 105 === In recent years, the portable healthcare devices are more and more popular. The wireless transmissions are widely used in these devices, such as Bluetooth and ZigBee. However, these techniques have drawbacks of high power consumption and have interferences in the shared frequency band, Therefore, body channel communication (BCC) is proposed because it has relatively low power consumption and has less interferences. The proposed BCC transceiver which using Walsh codes as modulated codes is implemented on the Vurtex-7 VC707 evaluation board (EVB). The Walsh codes are orthogonal codes and the maximum number of error bits that can be tolerated can be up to half of the code’s length. Moreover, the CID of the Walsh codes are limited to 2 to avoid the no data transition situation which makes the receiver difficulty to recover the clock and data. There are no error bits occurred when transmitting 108 bits at 140 cm distance and at data rate of 488 Kbps (3.12 Mcps), 976 Kbps (6.25 Mcps), and 1.95 Mbps (12.5 Mcps). Moreover, the BER is 10-5 at 3.9 Mbps (12.5 Mcps). In the proposed BCC transceiver, because of high data reliability, the multi-media transmission is supported. The image can be completely transmitted and received through 140 cm distance and the maximum data rate is 1.95 Mbps.