Effects of Channel Estimation on Multiuser Virtual MIMO-OFDMA Relay-Based Networks
<p/> <p>A practical multiuser cooperative transmission scheme denoted as <it>Virtual Maximum Ratio Transmission</it> (VMRT) for multiple-input multiple-output-orthogonal frequency division multiple access (MIMO-OFDMA) relay-based networks is proposed and evaluated in the pres...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2010-01-01
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| Series: | EURASIP Journal on Wireless Communications and Networking |
| Online Access: | http://jwcn.eurasipjournals.com/content/2010/764784 |
| Summary: | <p/> <p>A practical multiuser cooperative transmission scheme denoted as <it>Virtual Maximum Ratio Transmission</it> (VMRT) for multiple-input multiple-output-orthogonal frequency division multiple access (MIMO-OFDMA) relay-based networks is proposed and evaluated in the presence of a realistic channel estimation algorithm and using low-density parity-check (LDPC) codes. It is shown that this scheme is robust against channel estimation errors. It offers diversity and array gain, keeping the complexity low with a multiuser and multiantenna channel estimation algorithm that is simple and efficient. In addition, the combination with LDPC codes provides improved gains; diversity gains larger than 6 dB can be easily obtained with a reduced number of relays. Thus, this scheme can be used to extend coverage or increase system throughput by using simple cooperative OFDMA-based relays.</p> |
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| ISSN: | 1687-1472 1687-1499 |