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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Jinyuan Chen Elia, P. |
| Copyright Year | 2013 |
| Description | Author affiliation: Mobile Commun. Dept., EURECOM, Sophia Antipolis, France (Jinyuan Chen; Elia, P.) |
| Abstract | In the setting of the time-selective two-user multiple-input single-output (MISO) broadcast channel (BC), recent work by Tandon et al. considered the case where - in the presence of error-free delayed channel state information at the transmitter (delayed CSIT) - the current CSIT for the channel of user 1 and of user 2, alternate between the two extreme states of perfect current CSIT and of no current CSIT. Motivated by the problem of having limited-capacity feedback links which may not allow for perfect CSIT, as well as by the need to utilize any available partial CSIT, we here deviate from this `all-or-nothing' approach and proceed - again in the presence of error-free delayed CSIT - to consider the general setting where current CSIT now alternates between any two qualities. Specifically for $I_{1}$ and $I_{2}$ denoting the high-SNR asymptotic rates-of-decay of the mean-square error of the CSIT estimates for the channel of user 1 and of user 2 respectively, we consider the case where $I_{1},$ $I_{2}$ ϵ {γ,α} for any two positive current-CSIT quality exponents γ, α as a result, the overall current CSIT - for both users' channels - alternates between any four states $I_{1}I_{2}$ ϵ {γγ,γα, αγ, αα}. In a fast-fading setting where we consider communication over any number of coherence periods, and where each CSIT state $I_{1}I_{2}$ is present for a fraction $λ_{I}_{1}_{I}_{2}$ of this total duration (naturally forcing $λ_{αγ}$ ; $λ_{γα}$ ; $λ_{αα}$ ; $λ_{γγ}$ = 1), we focus on the symmetric case of $λ_{αγ}$ = $λ_{γα},$ and derive the optimal degrees-of-freedom (DoF) region to be the polygon with corner points {(0,0), (0,1), (λ̅, 1), (2+λ/3, 2+λ/3), (1, λ̅), (1,0)}, for some λ̅ Δ $(λ_{γα}$ ; $λ_{γγ})γ$ ; $(λ_{αγ}$ ; $λ_{αα})α,$ representing a measure of the average CSIT quality. The result, which is supported by novel communication protocols, naturally incorporates the aforementioned `Perfect current' vs. `No current' setting by limiting $I_{1},$ $I_{2}$ ϵ {0,1}, as well as the Yang et al. and Gou and Jafar setting by forcing α = γ. Finally, motivated by recent interest in frequency correlated channels with unmatched CSIT, we also analyze the setting where there is no delayed CSIT. |
| Sponsorship | IEEE Signal Process. Soc. |
| Starting Page | 1860 |
| Ending Page | 1864 |
| File Size | 189469 |
| Page Count | 5 |
| File Format | |
| e-ISBN | 9781479923908 |
| DOI | 10.1109/ACSSC.2013.6810625 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2013-11-03 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Transmitters Decoding Channel state information Channel estimation Noise Frequency estimation Vectors |
| Content Type | Text |
| Resource Type | Article |
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