Sign In

Communications of the ACM

ACM TechNews

Researchers Develop Acoustic-Based Data Transfer System For Phones

View as: Print Mobile App Share:
mobile phone emiting data, illustration


Microsoft researchers have developed Dhwani, a system that offers near-field communications (NFC)-like capabilities without requiring dedicated wireless hardware. Dhwani uses sound, employing the speaker and microphone on phones to securely exchange data at speeds of up to 2.4 kilobits/second, which is "sufficient for most existing NFC applications," the researchers note. Although the range of Dhwani is significantly shorter than Wi-Fi or Bluetooth, it is similar to NFC, and will work effectively over a distance of a few centimeters.

Dhwani is software-based and therefore does not require specialized hardware for transfers, and the researchers also say the technology is more secure than NFC. They also note the use of a more advanced antenna could make it possible to monitor NFC communications distances of up to a meter. Dhwani features JamSecure security that "uses self-jamming coupled with self-interference cancellation at the receiver" to protect data transmissions.

The basis of Dhwani's communication system is an acoustic software-defined radio. The researchers determined that 6 KHz was the lower limit for the system below which typical ambient noise would interfere with transmissions.

From Computerworld Australia
View Full Article


Abstracts Copyright © 2013 Information Inc., Bethesda, Maryland, USA


No entries found

Sign In for Full Access
» Forgot Password? » Create an ACM Web Account