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The performance of the uplink (UL) and downlink (DL) of IEEE 802.16e-2005 or Worldwide Inter-Operability Microwave Access (WiMAX) standard is studied via extensive computer simulations in this paper. The channel estimation is introduced and its impact on the system performance is evaluated under different channel conditions. The main contribution is to address the impact of the hybrid automatic repeat...
This paper presents a performance evaluation of enhanced link adaptation techniques for MIMO-OFDM systems with imperfect feedback and channel estimation. In the link-level simulations, the channel modeling is based on MIMO channel measurements in line-of-sight and non line-of-sight scenarios. An adaptation process that switches between beamforming, diversity and multiplexing modes in combination with...
In this paper we first introduce a fixed beamfroming (BF) technique for orthogonal frequency division multiplexing (OFDM) systems. The basic idea of beamforming is that the phase of the transmitted signal is shifted according to the user direction, while at the receiver side, the phase shifting performs again to maximize the received signal-to-noise ratio (SNR). We also propose a discrete Fourier...
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