NDLI: Low-cost MIMO real-time demonstrator: concept and first results

Content Provider	IEEE Xplore Digital Library
Author	Kuropatwinski, W. Lillie, F. Geng, N. Jondral, F.K.
Copyright Year	2004
Description	Author affiliation: Inf. & Commun. Mobile, Siemens AG, Munich (Kuropatwinski, W.; Lillie, F.; Geng, N.)
Abstract	In our work, we would like to gain experience on real-world problems of MIMO transmission (e.g., antenna coupling, effects of analog/digital filter accuracy, power consumption, timing, DC offset, channel estimation, TX/RX processing requirements) with a hardware demonstrator as simple as possible. In addition to a quick design and implementation, low overall size is a major goal. To achieve both, we use existing small and low-cost GSM/EDGE modules for the MIMO transmitter and receiver. This paper summarizes the system parameters (e.g., channel bandwidth) as well as the hardware implementation details (e.g., a flexible antenna array setup). It presents MIMO performance measures obtained with the demonstrator (when used as channel sounder) in conjunction with offline MIMO RX processing. In a later stage (not part of this first publication), real-time processing will be implemented (on FPGA and/or DSP), both for open-loop (e.g., STBC, LDC, BLAST) and closed-loop MIMO transmission (i.e., for both long-term and instantaneous channel knowledge at the transmitter). Although somewhat limited due to the narrow GSM/EDGE-like channel bandwidth of about 200 kHz, the results obtained and experience gained with this MIMO demonstrator can be largely applied or scaled to B3G/4G and next-generation WLANs of much wider bandwidth, in particular when based on OFDM (with each subcarrier treated as flat fading)
Starting Page	25
Ending Page	29
File Size	622502
Page Count	5
File Format	PDF
ISBN	0780383273
DOI	10.1109/WSA.2004.1407643
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2004-03-18
Publisher Place	Germany
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	GSM Couplings Energy consumption Accuracy Transmitters Transmitting antennas Bandwidth MIMO Hardware Digital filters
Content Type	Text
Resource Type	Article

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