| Presentation | 2009-06-26 Transparent Inband Feedback for Training-Based MIMO Systems Oussama SOUIHLI, Tomoaki OHTSUKI, |
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| PDF Download Page |  PDF download Page Link |
| Abstract(in Japanese) | (See Japanese page) |
| Abstract(in English) | Recently, Echo-MIMO, a delay-free feedback scheme has been proposed for Closed-Loop MIMO systems, where the receiver echoes the received signal on the fly to the transmitter without any processing. While this reduced feedback latency allows for more use of the channel's coherence time for data transmission, it comes at high power-and-bandwidth costs, as two MIMO transmissions are required in the feedback phase. In this report, we present a feedback scheme that preserves the advantages of Echo-MIMO while requiring only one feedback transmission. The echoed signals are judiciously combined with the receiver's signals such that their separation at the transmitter be lossless, and that no extra transmit power nor band-width be required. In addition, we highlight the estimation accuracy degradation in Echo-MIMO owing to the echoed noise, and analytically confirm the intuition that removing the noise prior to echoing the received signal provides better estimation than echoing the noisy received signal as is and later account for the noise effect upon echo reception. Simulation results show that the proposed scheme outperforms Echo-MIMO in terms of channel estimation accuracy and achievable capacity of up to 5dB and 10bit/sec/Hz, respectively. |
| Keyword(in Japanese) | (See Japanese page) |
| Keyword(in English) | Closed-Loop MIMO / channel estimation / CSI feedback / Rayleigh fading |
| Paper # | RCS2009-51 |
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| Committee | RCS |
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| Conference Date | 2009/6/18(1days) |
| Place (in Japanese) | (See Japanese page) |
| Place (in English) | |
| Topics (in Japanese) | (See Japanese page) |
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| Paper Information | |
| Registration To | Radio Communication Systems (RCS) |
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| Language | ENG |
| Title (in Japanese) | (See Japanese page) |
| Sub Title (in Japanese) | (See Japanese page) |
| Title (in English) | Transparent Inband Feedback for Training-Based MIMO Systems |
| Sub Title (in English) | |
| Keyword(1) | Closed-Loop MIMO |
| Keyword(2) | channel estimation |
| Keyword(3) | CSI feedback |
| Keyword(4) | Rayleigh fading |
| 1st Author's Name | Oussama SOUIHLI |
| 1st Author's Affiliation | Department of Information and Computer Sciences, Keio University() |
| 2nd Author's Name | Tomoaki OHTSUKI |
| 2nd Author's Affiliation | Department of Information and Computer Sciences, Keio University |
| Date | 2009-06-26 |
| Paper # | RCS2009-51 |
| Volume (vol) | vol.109 |
| Number (no) | 105 |
| Page | pp.pp.- |
| #Pages | 6 |
| Date of Issue | |