Channel estimation and optimal training with the LMMSE criterion for OFDM-based two-way relay networks

Tran, Minh Tam; Wang, Jin Soo; Song, Iickho; Kim, Yun Hee

doi:10.1186/1687-1499-2013-140

Cited by 7 publications

(2 citation statements)

References 27 publications

(38 reference statements)

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“…From (14), it can be rewritten in a matrix form, where † B denotes the Moore-Penrose pseudo inverse matrix of B [9]. By using (17), all users' CIRs can be estimated all together at the BS.…”

Section: Proposal Of Time Domain Channel Estimation Methodsmentioning

confidence: 99%

Time domain channel estimation method for uplink OFDMA system

Mata

Hourai

Möri

et al. 2015

2015 22nd International Conference on Telecommunications (ICT)

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Orthogonal Frequency Division Multiple Access (OFDMA) is considered as one of promising wireless access techniques which can accommodate multiple users flexibly and efficiently. In the uplink OFDMA system, it is required to estimate all users' channel frequency responses (CFRs) simultaneously which are used in the equalization for the data information at the base station (BS). To realize this requirement, the Discrete Fourier Transform interpolation based channel estimation (DFTI-CE) method was proposed in which all users transmit one scattered pilot symbol to the BS at the same time. The DFTI-CE method can achieve higher estimation accuracy for all users' CFRs only when the number of FFT points is equal to the number of data subcarriers which corresponds to the Nyquist rate. However the CFR estimation accuracy would be degraded in the actual OFDM system at the non-Nyquist rate in which null subcarriers (zero padding) are added at both ends of OFDM data subcarrier to reject the aliasing occurring at the output of digital to analogue (D/A) converter. To solve this problem, this paper proposes a time domain channel estimation (TD-CE) method which can achieve higher estimation accuracy even at the non-Nyquist rate. This paper presents various simulation results for the uplink OFDMA system in the time-varying fading channels to demonstrate the effectiveness of proposed estimation method.

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Section: Proposal Of Time Domain Channel Estimation Methodsmentioning

confidence: 99%

Time domain channel estimation method for uplink OFDMA system

Mata

Hourai

Möri

et al. 2015

2015 22nd International Conference on Telecommunications (ICT)

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“…In [8], the pilot allocation that maximizes the capacity for a MMSE channel estimator is shown to also correspond to equipowered, equispaced pilots. In [9], the authors derive the MSE-optimal training condition for the MMSE estimator in the context of a two-way relay OFDM-based network.…”

Section: Introductionmentioning

confidence: 99%

Generalized optimal pilot allocation for channel estimation in multicarrier systems

Rottenberg

Horlin

Kofidis

et al. 2016

2016 IEEE 17th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC)

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This paper addresses the design of MSE-optimal preambles for multicarrier channel estimation under a maximum likelihood or minimum mean squared error criterion. The derived optimality condition gives insight on how to allocate the pilots that compose the preamble. While many papers show that equispaced and equipowered allocation is optimal, the generalized condition demonstrates that there exist many different configurations that offer the same optimal performance. Furthermore, the condition applies not only to maximum likelihood but also to minimum mean squared error channel estimation. An application of the generalized condition in the presence of inactive subcarriers (virtual subcarriers problem) is shown such that a non equispaced allocation can achieve the same optimal performance as if an equispaced one could be used. Document type : Communication à un colloque (Conference Paper) Référence bibliographiqueRottenberg, François ; Horlin, François ; Kofidis, Eleftherios ; Louveaux, Jérôme. Generalized optimal pilot allocation for channel estimation in multicarrier systems.Abstract-This paper addresses the design of MSE-optimal preambles for multicarrier channel estimation under a maximum likelihood or minimum mean squared error criterion. The derived optimality condition gives insight on how to allocate the pilots that compose the preamble. While many papers show that equispaced and equipowered allocation is optimal, the generalized condition demonstrates that there exist many different configurations that offer the same optimal performance. Furthermore, the condition applies not only to maximum likelihood but also to minimum mean squared error channel estimation. An application of the generalized condition in the presence of inactive subcarriers (virtual subcarriers problem) is shown such that a non equispaced allocation can achieve the same optimal performance as if an equispaced one could be used.

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