Multiantenna Analog Network Coding for Multihop Wireless Networks
This paper proposes a two-phase minimum mean-square-error bidirectional amplify-and forward (MMSE-BAF) relaying protocol to allow two sources exchange independent messages via a relay node equipped with multiple antennas. MMSE-BAF performs a joint linear MMSE filtering of the received signal after t...
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| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
Wiley
2010-01-01
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| Series: | International Journal of Digital Multimedia Broadcasting |
| Online Access: | http://dx.doi.org/10.1155/2010/368562 |
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| Summary: | This paper proposes a two-phase minimum mean-square-error bidirectional
amplify-and forward (MMSE-BAF) relaying protocol to allow two sources
exchange independent messages via a relay node equipped with multiple antennas.
MMSE-BAF performs a joint linear MMSE filtering of the received signal after
the multiple access phase before amplifying and forwarding the filtered signal
using a single transmit antenna, possibly through a specific antenna selection
procedure, during the broadcast phase. The proposed protocol extends upon the
so-called analog network coding schemes in the literature in that it inherently
exploits the multiple antennas at the relay station to reduce the noise enhancement
typical of an AF protocol, and can also compensate for link imbalances between
the relay and the sources and is agnostic to sources' modulation and coding
schemes. We derive the instantaneous signal-to-noise ratio expressions for the
received signal by the sources in the downlink and provide extensive link-level
simulations for the MMSE-BAF protocol subject to both frequency flat and
selective fading. Furthermore, we pinpoint the modifications to be incorporated
into the IEEE 802.16e orthogonal-frequency-division multiple access (OFDMA)
cellular standard (mobile WiMax) to enable support of multiantenna bidirectional
communications and show that MMSE-BAF is a viable solution within that
framework. |
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| ISSN: | 1687-7578 1687-7586 |