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For metro applications, direct detection offers the advantages of low cost and low complexity. Discrete multi-tone (DMT) is a promising format due to its high spectral efficiency, flexibility and tolerance to chromatic dispersion (CD). In this work, single-side-band-DMT (SSB-DMT) and tuneable electrical dispersion compensation double side-band-DMT (TEDC-DSB-DMT) are summarized and compared.
Azimuth radar echo can be seen as the convolution of antenna pattern and target backscatter coefficient. Traditional methods of radar angle measurement use the deconvolution techniques with poor anti-noise performance. This paper firstly analyzes the causes of single channel deconvolution morbid. Then, based on the signal modeling and analysis process, a high-resolution angle measurement algorithm...
Layered-Division-Multiplexing (LDM) technology has been shown to provide significant performance improvent for digital TV (DTV) broadcasting systems to simultaneously deliver a robust mobile TV service and one or more high-throughput fixed services in the same 6 MHz TV channel. So far, the focus of LDM for future DTV systems has been put on delivering mixed mobile and fixed services since this is...
Layered-Division-Multiplexing (LDM) is a physical-layer non-orthogonal multiplexing (NOM) technology that can efficiently deliver multiple digital TV services with different requirements on throughput and robustness. In literature, channel capacity analysis has been conducted to prove the fundamental advantage of LDM over T/FDM systems when delivering mixed services with different SNR thresholds....
This paper studies layered division multiplexing (LDM) for local cover age/services, such as location targeted advertisement or local content insertion. The LDM upper layer can be used to deliver time-division multiplexed (TDM-ed) mobile-HD and 4k-UHD services. The LDM lower layer with a negative SNR threshold can reliably provide seamless local coverage/service from each single frequency network...
One of the top-priority requirements for the next generation digital TV (NG-DTV) system is the capability to deliver robust services to both mobile and fixed receivers under challenging propagation conditions. One typical challenging scenario is indoor reception, where the penetration loss could be as high as 20 dB. Other challenging scenarios include outdoor mobile reception at various receiver speeds,...
C-band 56Gbps transmission over 80-km single mode fiber without chromatic dispersion compensation is realized by using discrete multi-tone modulation based on low cost electro-absorption modulated laser and receiver. The required OSNR of 26.3 dB at BER of 4E-3 is achieved.
This paper proposes a two dimensional (2D) code, which has vertical raptor-like rate-compatible LDPC code and horizontal Reed Solomon (RS) code, for the terrestrial CTxn system. The proposed 2D code not only removes error-floor phenomenon with a help of RS code, but also does not require a complex interleaver for stable reception under fading channels because the 2D code itself provides block-type...
Cloud transmission (Cloud-Txn) with Layer-Division-Multiplexing (LDM) was proposed as a candidate Physical Layer (PHY) technology for next generation digital TV broadcasting system. This paper presents a fundamental analysis on the channel capacity allocation among the different layers of a LDM-based transmission system. The analysis reveals that, for delivering fixed and mobile TV services in the...
Cloud transmission (Cloud-Txn) with layer-division-multiplexing (LDM) was proposed as a candidate Physical Layer (PHY) technology for the next generation digital TV broadcasting system. In this paper, we investigate the performance of the upper-layer signal cancellation with DFT-based channel estimation techniques, due to their capability of providing near-optimal performance for challenging channels...
We introduce a novel modulation scheme termed hierarchical modulation to increase the transmission capacity of OFDM transmitter with limited bandwidth in a long-reach OFDM-PON. A proof-of-concept experiment is performed to verify the feasibility of our proposal.
Subspace leakage is a problem frequently encountered in many real-world multidimensional array space time adaptive processing (STAP). It leads to effective rank of clutter increased and clutter spectral spread, which seriously impacts on the performance of clutter suppression of STAP. We consider that polarization information combined to spatial and Doppler information can improve the performance...
Clutter suppression is the serious problem for airborne surveillance radar systems. The paper analyses polarization-space-time(PST) joint domain adaptive processing technique for clutter suppress. Firstly, the received target signal model was estabLished in the case of completely polarized wave. Secondly, the optimal weighted vector is obtained using the maximal outputting SINR principle. Then, a...
Topology control for maximizing network capacity for the practical power-fixed IEEE 802.11-based ad hoc networks is deeply investigated in this paper. Several interference-model-based algorithms have been proposed to maximize network capacity through reducing interference during recent years. However, most of those algorithms are based on node location and not practical in IEEE 802.11-based ad hoc...
Measuring the parameters of TCP and conducting performance tests allow us to accurately study the connectivity characteristics of WLANs. It also helps us to investigate how TCP traffic will affect other traffics such as video, audio, etc. In this paper, we measured the performance of TCP/UDP in IEEE 802.11 wireless networks in the one-hop and multi-hop scenarios using throughput and bit error rate...
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