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A controversial technical discussion is raised whether WiMAX or LTE is the most promising 4G technology. Since LTE and WIMAX as 4G systems have both adopted OFDM as the preferred physical technology for better spectrum efficiency, the RF parts of those systems have to face major challenges. Hence the extensively applied error vector magnitude (EVM) can be used as an effective and efficient method...
The low feedback link adaptation technique based on MIESM (mutual information based exponential SNR mapping) has been extensively used in the literature for 802.16 based systems. The previous work on MIESM uses equal modulation order for all the subcarriers in an OFDM block. We have proposed the concept of unequal modulation for the subcarriers in the single OFDM block, and derived a mathematical...
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