Channel estimation for space-time block coded OFDM systems in the presence of multipath fading
Yükleniyor...
Dosyalar
Tarih
2002
Yazarlar
Dergi Başlığı
Dergi ISSN
Cilt Başlığı
Yayıncı
IEEE
Erişim Hakkı
info:eu-repo/semantics/closedAccess
Özet
In this paper, a computationally efficient, non-data-aided maximum a posterlori(MAP) channel estimation algorithm is proposed for orthogonal frequency division multiplexing (OFDM) systems with transmitter diversity using space-time block coding. The Alamouti's transmit diversity scheme with two transmit antennas is employed here and generalized for OFDM systems. The algorithm requires a convenient representation of the discrete multipath fading channel based on the Karhunen-Loeve orthogonal expansion and estimates the complex channel parameters of each subcarriers iteratively using the Expectation Maximization(EM) method, which converges to the true MAP estimation of the unknown channel. Ananalytical expression is derived for the Modified Cramer-Rao. lower bound of the proposed MAP channel estimator. The performance is presented in terms of the mean-square error for a system employing QPS signaling.
Açıklama
Anahtar Kelimeler
Diversity, Block codes, Channel estimation, Channel state information, Fading, Iterative algorithms, Maximum likelihood decoding, OFDM modulation, Receiving antennas, Transmitters, Transmitting antennas, Alamouti's transmit diversity scheme, Expectation Maximization, Karhunen-Loeve orthogonal expansion, Modified Cramer-Rao lower bound, QPS signaling, Complex channel parameters, Discrete multipath fading channel, Maximum a posteriori, Mean-square error, Multipath fading, Orthogonal frequency division multiplexing, Space-time block coded OFDM systems, Space-time block coding, Transmit antennas, Transmitter diversity, Unknown channel, Fading channels, Frequency response, Mean square error methods, Multipath channels, Space-time codes
Kaynak
IEEE Global Telecommunications Conference (GLOBECOM 02)
WoS Q Değeri
N/A
Scopus Q Değeri
N/A
Cilt
Sayı
Künye
Panayırcı, E. & Çırpan, H. A. (2002). Channel estimation for space-time block coded OFDM systems in the presence of multipath fading. Paper presented at the IEEE Global Telecommunications Conference (GLOBECOM 02), 1157-1161. doi:10.1109/GLOCOM.2002.1188377
