Abstract
A new frequency and space precoding scheme for multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) systems is presented. For frequency precoding, the data symbols to be transmitted are divided into multiple substreams, and a predefined unitary matrix is applied to each substream to obtain different linear combinations of data symbols in the substream to gain frequency diversity. For space precoding, different precoding matrices selected from a predefined orthogonal matrix are used to allocate each frequency precoded data symbol to all transmit antennas to gain spatial diversity. The number of substreams and the corresponding data symbol mapping scheme are also adaptively determined at the receiver under varying received signal strength and MIMO channel conditions, and are made available to the transmitter through a low-rate feedback channel. Simulation results show that the proposed MIMO OFDM system with adaptive substream selection can effectively exploit both frequency and spatial diversity, and deliver the maximum system throughput.
Original language | English |
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Title of host publication | 2009 IEEE Wireless Communications and Networking Conference, WCNC 2009 |
Subtitle of host publication | Proceedings |
Place of Publication | Pistacaway, NJ |
Publisher | Institute of Electrical and Electronics Engineers (IEEE) |
Pages | 1-6 |
Number of pages | 6 |
ISBN (Electronic) | 9781424429486 |
ISBN (Print) | 9781424429479 |
DOIs | |
Publication status | Published - 2009 |
Externally published | Yes |
Event | 2009 IEEE Wireless Communications and Networking Conference, WCNC 2009 - Budapest, Hungary Duration: 5 Apr 2009 → 8 Apr 2009 |
Other
Other | 2009 IEEE Wireless Communications and Networking Conference, WCNC 2009 |
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Country | Hungary |
City | Budapest |
Period | 5/04/09 → 8/04/09 |
Keywords
- Frequency diversity
- Frequencyselective fading
- Multiple input multiple output (MIMO)
- Orthogonal frequency division multiplexing (OFDM)
- Spatial diversity
- Throughput