Spatial Diversity and Channel Statistics-Based RF-Baseband Co-design for Antenna Selection
Author
Summary, in English
For MIMO systems, we introduce two novel architectures that significantly reduce the required number of expensive RF chains and still perform as well as a conventional full complexity solution for many cases of interest. We combine RF pre-processing - based solely on channel statistics and not instantaneous channel state - with selection and corresponding baseband signal processing. For a system with L RF chains, N/sub t/ transmit and N/sub r/ receive antennas, the first architecture uses an L/spl times/N/sub r/ RF pre-processing matrix that outputs only L streams followed by baseband signal processing. The second one uses an N/sub r//spl times/N/sub r/ RF pre-processing matrix followed by selection of L streams and baseband signal processing. We derive the optimal RF pre-processing matrices and the corresponding baseband combining vectors that maximize the average output SNR. A beamforming-based geometric intuition is also developed. With the constraints of today's IC fabrication technology in mind, an approximation that requires only variable phase-shifters and adders, is also proposed and shown to incur a negligible loss in performance. In the process, a fair benchmark for comparing with the previously proposed FFT Butler pre-processing is provided.
Publishing year
2004
Language
English
Pages
1658-1662
Publication/Series
IEEE 60th Vehicular Technology Conference, VTC2004-Fall.
Volume
3
Document type
Conference paper
Topic
- Electrical Engineering, Electronic Engineering, Information Engineering
Keywords
- signal processing
- diversity reception
- beam steering
- MIMO systems
Conference name
IEEE 60th Vehicular Technology Conference, VTC2004-Fall.
Conference date
2004-09-26 - 2004-09-29
Status
Published
ISBN/ISSN/Other
- ISSN: 1090-3038
- ISBN: 0-7803-8521-7