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A digital chaos-masked optical encryption scheme is proposed and demonstrated. The transmitted signal is completely masked by interference chaotic noise in both bandwidth and amplitude with analog method via dual-drive Mach-Zehnder modulator (DDMZM), making the encrypted signal analog, noise-like and unrecoverable by post-processing techniques. The decryption process requires precise matches of both...
In this paper, we design a novel polar coded intensity modulation direct detection (IM/DD) optical orthogonal frequency division multiplexing-based (OFDM) system used in short reach interconnection. The experimental results demonstrate the 9.5-dB net coding gain (NCG) at the BER of 1e-3 after 40-km standard single mode fiber (SSMF) transmission.
In this paper, we propose a key space enhanced chaos-based encryption scheme with no requirement of redundant sideband information in an orthogonal frequency division multiplexing passive optical network (OFDM-PON). For the first time, a simple 1-D chaotic logistic map is employed to scramble the chaotic subcarrier allocation both in time/frequency domain and logical operation, which provides a huge...
We demonstrate a real-time VLC system using 2ASK-OFDM coding for high-speed communication and communication in positioning simultaneously. The proposed 2ASK-OFDM modulation and demodulation are performed using FPGA and results verify the feasibility of the system.
We propose a FFT-based universal filtered multicarrier (UFMC) modulation scheme used for datacenter interconnect to support low overhead and agile transmission. The feasibility of this proposed UFMC scheme is experimentally investigated in the IM/DD system. The results have shown that, the UFMC-based datacenter interconnect can achieve great system overhead reduction and support different subband...
This paper investigates the resource allocation problem for the cluster-based cooperative multicast in orthogonal frequency division multiplexing (OFDM)-based cognitive radio (CR) systems. Aiming at maximizing the system sum rate, an efficient clustering scheme is proposed. It begins with the clustering phase where secondary users (SUs) with good channel conditions are selected as cluster heads, while...
The concept of small cells such as femtocell has been regarded as a promising solution to achieve green communication and deal with the coverage hole and growth of traffic within macrocells. However, the unpredictable deployment pattern of such nodes makes static network planing impractical and the overlaying macrocell and femtocell tiers may suffer significant cross-tier interference from each other...
In the multi-cell environment, the approaches that are suitable for the single cell scenario may cause excessive interference to other cells and become suboptimal. In this paper, we present a number of receiver-centric power allocation schemes that take into account the detrimental impact of allocated resources to the neighboring cells, and use it as a guideline in determining the appropriate power...
We propose a three-stage cross correlation-based timing synchronization algorithm for multiband-OFDM UWB systems. By utilizing the time-domain base sequence of the packet/frame synchronization preamble, the proposed algorithm first performs a coarse estimation on the reference symbol boundary, followed by a fine estimation on locating the exact boundary of the FFT window for the symbol, and a final...
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