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2009
IEEE

On perfect channel identifiability of semiblind ML detection of orthogonal space-time block coded OFDM

9 years 7 months ago
On perfect channel identifiability of semiblind ML detection of orthogonal space-time block coded OFDM
This paper considers maximum-likelihood (ML) detection of orthogonal space-time block coded OFDM (OSTBC-OFDM) systems without channel state information. Our previous work has shown an interesting identi ability result, that the whole time-domain channel can be uniquely identi ed by only having one subchannel to transmit pilots. However, this identi ability is in a probability-one sense, under some mild assumptions on the channel statistics. In this paper we establish a "perfect" channel identi ability (PCI) condition under which the channel is always uniquely identi able. It is shown that PCI can be achieved by judiciously applying the so-called non-intersecting subspace OSTBCs. The resultant PCI achieving scheme has its number of pilots larger than that used in the previous probability-one identi ability achieving scheme, but smaller than that required in conventional pilot-aided channel estimation. Simulation results are presented to show that the proposed scheme can provi...
Tsung-Hui Chang, Wing-Kin Ma, Chuan-Yuan Huang, Ch
Added 18 Feb 2011
Updated 18 Feb 2011
Type Journal
Year 2009
Where ICASSP
Authors Tsung-Hui Chang, Wing-Kin Ma, Chuan-Yuan Huang, Chong-Yung Chi
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