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• W2149017229 abstract "The Effective Exponential SNR Mapping (EESM) is an indispensable tool for analyzing and simulating next generation orthogonal frequency division multiplexing (OFDM) based wireless systems. It converts the different gains of multiple subchannels, over which a codeword is transmitted, into a single effective flat-fading gain with the same codeword error rate. It facilitates link adaptation by helping each user to compute an accurate channel quality indicator (CQI), which is fed back to the base station to enable downlink rate adaptation and scheduling. However, the highly non-linear nature of EESM makes a performance analysis of adaptation and scheduling difficult; even the probability distribution of EESM is not known in closed-form. This paper shows that EESM can be accurately modeled as a lognormal random variable when the subchannel gains are Rayleigh distributed. The model is also valid when the subchannel gains are correlated in frequency or space. With some simplifying assumptions, the paper then develops a novel analysis of the performance of LTE's two CQI feedback schemes that use EESM to generate CQI. The comprehensive model and analysis quantify the joint effect of several critical components such as scheduler, multiple antenna mode, CQI feedback scheme, and EESM-based feedback averaging on the overall system throughput." @default.
• W2149017229 created "2016-06-24" @default.
• W2149017229 creator A5003013515 @default.
• W2149017229 creator A5090732983 @default.
• W2149017229 date "2011-10-01" @default.
• W2149017229 modified "2023-10-01" @default.
• W2149017229 title "An Accurate Model for EESM and its Application to Analysis of CQI Feedback Schemes and Scheduling in LTE" @default.
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• W2149017229 doi "https://doi.org/10.1109/twc.2011.081011.102247" @default.
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