DURIP FY 1999: Research Instrumentation for a Wireless Communications Research Laboratory
Final rept. 1 Mar 1998-28 Feb 1999
PURDUE UNIV LAFAYETTE IN SCHOOL OF ELECTRICAL ENGINEERING
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An experimental test-bed has been constructed for evaluating synchronization, equalization, and interference cancellation algorithms for digital communications. The transmitter portion of the test-bed consists of a baseband digital modulator composed of either a DSP development station or a custom digital circuit, a digital up-converter, and an RF transmitter unit. This configuration provides sophisticated digital modulations for wireless communications in an easily adaptable framework. The receiver portion consists of an RF receiver unit, an analog-to-digital converter ADC, a digital down-converter, and a data acquisition unit. The RF receiver, essentially the reverse function of the RF transmitter unit discussed above, receives the RF signal and converts it to an IF for further processing. This provides a wide frequency coverage a large dynamic range, a built in automatic gain control AGC, and a baseband down-converter. The local oscillator LO is generated by a synthesized signal generator. The overall configuration provides a high performance flexible system for digitizing and outputting sampled data for further processing. The baseband data is stored in a PC using the data acquisition system and transferred to a workstation running SPW for analysis and demodulation. This test-bed serves as a general purpose RF transmitter and receiver allowing concentration of efforts on baseband algorithms and thereby rapid prototyping for broadband applications as in GPS or wideband CDMA.
- Electrical and Electronic Equipment
- Radio Communications