Mauri Honkanen

2.4-GHz receiver for sensor applications

This paper describes a receiver designed to meet the stringent power consumption requirements for sensor radio, which operates at 2.4-GHz ISM band with Bluetooth. To enable the reusability of the Bluetooth system, only slight changes are made in the radio parameters. The symbol rate is decreased and the increased modulation index removes the energy maximum from the channel center, which enables a low-complexity direct-conversion receiver solution. To meet the speed and power requirements, this receiver is fabricated in a 0.13-/spl mu/m CMOS process. The 3.4-mW direct-conversion demonstrator receiver includes a low-noise amplifier, which is merged with quadrature mixers, local oscillator buffers, and one analog baseband channel with a 1-bit limiter for analog-to-digital conversion. The receiver consumes 2.75 mA from a 1.2-V supply. The receiver achieves 47-dB voltage gain, 28-dB NF, -21-dBm IIP3, and +18-dBm IIP2.

Low end extension for Bluetooth

Low end extension (LEE) for Bluetooth is a technology to solve a simple mismatch. There are several small devices that could add value by having wireless radio connection to a mobile terminal but cannot bear the power consumption and cost associated with Bluetooth. However, mobile terminals are scheduled to have Bluetooth as the short-range wireless solution. LEE tackles the mismatch by introducing minor additions to the Bluetooth chip in mobile terminals that allows major savings in power consumption and cost in the radios embedded into small devices. Examples of the small devices include wireless sensors, toys, wireless pens etc. This work presents the principles of LEE radio technology and highlights some implementation issues.

VoIP call over WLAN with Bluetooth headset multiradio interoperability solutions

The local wireless networking techniques are becoming more and more popular in mobile terminals nowadays. Even so that wireless LAN (e.g. IEEE 802.11b) and Bluetooth solutions operating at the 2.4 GHz ISM band can be found in the same device. This enables new kind of usage possibilities and applications from which the most challenging ones, from interoperability point of view, are those that require simultaneous real-time operation over these links. One good example of this kind of service is a voice over IP (VoIP) call over the WLAN to the terminal with a Bluetooth headset. In this paper problems regarding different receiver architectures are presented and solutions for optimized Bluetooth usage are considered

Comparison of measured and simulated /spl pi//4-DQPSK adjacent channel power using a functional high power amplifier model

A novel functional nonlinear high power amplifier model for radio communication system simulations is used to study spectrum regeneration of a nonlinearly amplified /spl pi//4-DQPSK signal. Simulated adjacent channel power has been compared to measured results, and a very good resemblance is found. This together with a satisfactory intermodulation behaviour in a two-tone test simulation verifies that the proposed model is applicable to accurate adjacent channel power prediction in radio system simulations.

Extremely Simple Sensor Radio Protocol for Processorless Implementationx

Low end extension (LEE) for Bluetooth is a technology that enables devices very limited in power consumption, processing capabilities and memory to connect themselves to mobile terminals and other devices that currently feature a Bluetooth radio. Obviously, there are a number of small-sized devices that could add value by having wireless radio connection to mobile terminal but cannot bear the power consumption and cost associated to Bluetooth. LEE introduces minor additions to the Bluetooth chip in mobile terminals in order to allow major savings in power consumption and cost in the radios embedded into small devices such as wireless sensors and terminal enhancements. This paper presents the principles of LEE radio protocol, addresses the system capacity and elaborates the protocol implementation