Equalization for WLAN IEEE 802.11b

TitleEqualization for WLAN IEEE 802.11b
Publication TypeConference Paper
Year of Publication2004
AuthorsGerstacker, W., C. Jonietz, and R. Schober
Conference NameCommunications, 2004 IEEE International Conference on
Pagination3439 - 3444 Vol.6
Date Publishedjun.
Keywordsblock code, block codes, channel delay spread, complementary code keying transmission, decision feedback equalisers, error probability, frequency-selective Ricean fading channel, indoor channel, indoor radio, least mean squares methods, maximum likelihood sequence estimation, maximum-likelihood sequence estimation, minimum mean-squared error decision-feedback equalization, MLSE, MMSE, optimisation, optimization, reduced-state sequence estimation algorithm, Rician channels, vector signal model, wireless LAN, WLAN IEEE 802.11b

In this paper, complementary code keying (CCK) transmission over frequency-selective fading channels is investigated. Since CCK can be interpreted as a block code, an appropriate vector signal model is introduced. Based on pairwise error probabilities, we derive a performance approximation for optimum detection in general frequency-selective Ricean fading channels and compare the theoretical results with simulations. Because optimum maximum-likelihood sequence estimation (MLSE) is not practical for large channel delay spreads, minimum mean-squared error decision-feedback equalization (MMSE-DFE) is employed. Two different DFE approaches are considered here: (a) the conventional scalar DFE and (b) a block-based DFE optimized for the underlying vector signal model. Furthermore, a reduced-state sequence estimation (RSSE) algorithm is designed for CCK. Numerical results are given for fixed channels and common indoor fading channel profiles.


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