5 papers
PAPR Reduction for AFDM by Affine-Domain Circular Shift without Side Information
The Khai Nguyen, Ebrahim Bedeer
This paper proposes a novel method to reduce the peak-to-average-power-ratio (PAPR) of affine frequency division multiplexing (AFDM) signals without side information (SI). The meth…
Noncoherent Maximum Likelihood Detection for LoRa Signals in Multipath Fading
The Khai Nguyen, Ebrahim Bedeer, Robert Barton
This letter derives the noncoherent (NC) maximum likelihood (ML) detection rule for LoRa signals under Rician multipath fading channels. The proposed NC-ML detection only requires…
Novel Double-Chirp Preamble Design for Multiuser Asynchronous Massive MIMO LoRa Networks
The Khai Nguyen, Ebrahim Bedeer
This paper proposes a novel preamble design and detection method for multiuser asynchronous massive MIMO LoRa networks. Unlike existing works, which only consider the preamble dete…
Concurrent Transmission and Multiuser Detection of LoRa Signals
The Khai Nguyen, Ha H. Nguyen, Ebrahim Bedeer
This paper investigates a new model to improve the scalability of low-power long-range (LoRa) networks by allowing multiple end devices (EDs) to simultaneously communicate with mul…
Performance Improvement of LoRa Modulation with Signal Combining and Semi-Coherent Detection
The Khai Nguyen, Ha H. Nguyen, Ebrahim Bedeer
In this paper, we investigate performance improvements of low-power long-range (LoRa) modulation when a gateway is equipped with multiple antennas. We derive the optimal decision r…