Bluetooth™
Technology Overview
Bluetooth® is the established wireless communications technology for the short range, facilitating both voice and data transmission to create a personal area network. Bluetooth® is a spread-spectrum frequency-hopping system that works in the internationally available ISM bands at 2.4 GHz. Bluetooth® specification 2.0 implemented an enhanced data rate (EDR) of up to 3 Mbit/s. Future plans call for an increase in the data rate. Therefore, Bluetooth® has chosen ultra-wideband (UWB) from WiMedia® MB-OFDM as a new additional physical layer. With UWB, a data rate of up to 480 Mbit/s can be achieved. Bluetooth® also follows the trend toward lower power consumption. The Bluetooth® low energy technology has been adopted to achieve an ultra low power solution.
Applications
Bluetooth® is implemented in most mobile phones and laptops to enable wireless headset connectivity or connectivity between mobile phones and other devices for synchronization. Due to the high data rate of UWB, Bluetooth® can address applications such as video streaming in many environments, and it can be used as a wireless USB alternative. The very low power consumption of the Bluetooth® low energy technology addresses the market for sensors for sports, health and fitness, and also for watches. In addition, the ability to connect low power devices to mobile terminals make new applications possible.
Rohde & Schwarz Test Solutions
Rohde & Schwarz supports Bluetooth® with its communications testers such as the R&S®CBT and R&S®CMU200. Bluetooth® test functions are also available for all major Rohde & Schwarz test instruments. The signal generators and signal analyzers support Bluetooth® as well as all significant wireless communications standards. The new R&S®CMW500 wireless communications tester includes options for comprehensive production testing of Bluetooth®-enabled devices.
Key Parameters
| Bluetooth® (Basic Rate) | Bluetooth® (EDR) | |
|---|---|---|
| Frequency Range |
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| Modulation | GFSK |
Header: GFSK Data: π/4 DQPSK, 8DPSK |
| Multiple Access | FHSS | FHSS |
| Duplex (Uplink/Downlink) | TDD | TDD |
| Channel Bandwidth | 1 MHz | 1 MHz |
| Number of Channels | 79 | 79 |
| Peak Data Rate | 1 Mbit/s | 3 Mbit/s |
| Max. Speed | 1 km/h | 1 km/h |
| Max. Distance | 10 m | 10 m |
Standardization
With Bluetooth® EDR (Specification 2.0), Bluetooth® has achieved improved data rates at reduced power consumption. But higher data rates can only be achieved by an improved physical layer. With UWB (WiMedia MB-OFDM), Bluetooth® holds the promise of establishing itself as a successful high data rate standard. To follow the trend toward even lower power consumption, the Bluetooth® low energy technology has been adopted to achieve maximum battery life.
* The Bluetooth® word mark and logos are owned by the Bluetooth® SIG, Inc. and any use of such marks by Rohde&Schwarz is under license.
