Introduction
Wireless Testbeds provide the experimental facility to test the validity of algorithms and also to test any wireless setup. The Electrical and Computer engineering department at Stevens Institute of Technology currently has a high speed radio testbed which is capable of transmitting and receiving at 2.4 GHz. 2.4GHz ISM band is free to all, so many applications now are using this band. These applications include digital cordless phone, WLAN (802.11b), HomeRF, RFID, microwave oven and many other proprietary technologies. The large amount of units using the same band has raised the issues of possible interference. This has caused WLAN to migrate to 5.7 GHz ISM band. This has raised the need for a testbed which is capable of transmitting and receiving at 5.7GHz in order to analyze the latest in wireless technology.

Project Objective
Design, Build and Test a portable wireless Transceiver board capable of operating at the following three ISM bands, 915MHz, 2.4GHz and 5.7GHz. Deliverables at the end of this project will include a single transceiver board and a project report.

Principle
The chief requirements of the Testbed are a transmitter and a receiver. In the transmission process, the data is converted into electrical signals. A frequency of 70 MHz is taken from a LO and then made to pass through the modulator. After that, the data is the 70 MHz frequency passes through a low pass filter. Then the signals are made to pass through a mixer, which is attached to a LO which can provide the desired frequency. Then the signal is amplified and is received by an antenna. The signal passes in a reverse manner of the transmitter side and the electric signals are separated with a demodulator.

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