16 research outputs found
Collaborative radio resource allocation for the downlink of multiâcell multiâcarrier systems
Modulation and Coding schemes selection of Type-II HARQ in time-correlated fading channels
International audienc
Resource Allocation for Uplink-Downlink Cellular Network with Small Cells and Relays Enhanced
Systems and methods for scheduling of resources and poilot patterns to user terminals in a multi-user wireless network
Optimal Resource Allocation for Type-II HARQ based OFDMA Ad Hoc Networks under Rate and Power Constraints
International audienc
Affine frequency division multiplexing for next-generation wireless networks
Affine Frequency Division Multiplexing (AFDM) is a new multi-chirp waveform that can be generated and demodulated using the discrete affine Fourier transform (DAFT). DAFT is a generalization of discrete Fourier transform characterized with two parameters which can be adapted to better cope with both doubly dispersive channels and impairments at high-frequency bands. DAFT domain impulse response can indeed convey a full delay-Doppler representation of linear time-varying (LTV) channels, which allows AFDM to achieve the full diversity. Moreover, AFDM signals are maximally spread in time and frequency, thus providing a coverage gain that turns out to be robust against radio frequency impairments, such as carrier frequency offset and phase noise. In this paper, we show that AFDM offers the aforementioned advantages while being compatible with practical pilot-aided channel estimation and low-complexity channel equalization. Our analytical and simulation results evince that AFDM achieves significant throughput and reliability gains over state-of-the-art multicarrier modulation
Optimal Resource Allocation for Type-II HARQ based OFDMA Ad Hoc Networks under Individual Rate and Power Constraints
International audienc
Optimal Resource Allocation for Type-II HARQ based OFDMA Ad Hoc Networks under Individual Rate and PER Constraints
International audienc
Performance analysis over slow fading channels of a half-duplex single-relay protocol: Decode or Quantize and Forward
International audienc