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The paper aims at considering an alternative structure for transmitter and receiver in OFDM/OQAM systems. Such a structure is based on the frequency spreading at the transmitter and on the frequency despreading at the receiver and it is considered with reference to its implementation complexity. A modified structure is also proposed in order to reduce its computational complexity.
This paper describes the OFDM/QAM and OFDM/OQAM platforms that have been built these last years in Orange Labs in order to compare both modulation schemes. The targeted application was related to the physical layer of mobile terrestrial digital video broadcasting networks; then system parameters are borrowed from the corresponding DVB standards. In addition to a usual evaluation on AWGN channel, SFN...
In this paper, a spatially multiplexed orthogonal frequency division multiplexing multiple input multiple output (SM-OFDM-MIMO) IEEE 802.11n system is assumed. The 802.11n system performance is comparatively analyzed implementing either linear minimum mean squared error (MMSE) receiver or MMSE ordered successive cancellation (MMSE/OSIC) receiver with both hard and soft decision Viterbi decoding over...
In this paper, we propose and analyse an adaptive algorithm for distributed beamforming in OFDM systems over time and frequency selective channel conditions. We discuss how the key parameters related to convergence speed of the algorithm can be optimized to suit networks with different degrees of transmitter mobility. We show that the proposed adaptive algorithm is beneficial when used in mobile conditions;...
Interference alignment (IA) has been shown to achieve the maximum degrees of freedom in the multiple-input multiple-output (MIMO) K-user interference channel (IFC). In the presence of frequency-selective channels, orthogonal frequency-division multiplexing (OFDM) is typically used to deal with the multipath nature of the channel. While IA techniques can be applied in a per-subcarrier basis (post-FFT),...
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