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We design and assess some practical low-density parity-check (LDPC) coded transmission schemes for the Gaussian broadcast channel with confidential messages (BCC). This channel model is different from the classical wiretap channel model as the unauthorized receiver (Eve) must be able to decode some part of the information. Hence, the reliability and security targets are different from those of the...
The paper focuses on using Network Coding (NC) with TCP for multi-hop wireless networks to provide fault-tolerant and timely delivery of streaming data. The paper shows that there is an inherent latency in video playback when TCP with random linear NC is employed. With the objective of reducing latency and jitter at the receiver, the paper proposes a Variable Bucket size based Network Coding (VBNC)...
Network coding techniques are usually applied upon network layer protocols to improve throughput in wireless networks. However, the packet scheduling algorithm has long been neglected. With proper scheduling, bottleneck nodes can clear their packet queue faster than a vanilla round-robin scheduling algorithm. Therefore, a higher Coding+MAC gain can be achieved. In this paper, we formulate the scheduling...
In this paper, we investigate the performance of the so-called Cross Network operating under diverse Network Coding (NC) techniques. We study the impact of Medium Access Control (MAC) layer fairness on the throughput performance of the network for the cases of pure relaying, digital NC with and without overhearing and physical layer NC with and without overhearing. We provide a comparison among these...
This paper presents a quantization scheme for log-likelihood ratios in order to reduce the computational complexity of an iterative decoder recently proposed for wavelet-coded communication systems. In order to reduce the computational effort, the real-valued LLRs of encoded bits are quantized into three levels of reliability, with a threshold that is determined by minimizing the mean squared error...
Wireless video transmission is one of the main applications of wireless local area networks. And high-speed video transmission can be achieved with the application of MIMO-OFDM technologies. But the conventional digital video transmission in MIMO has to degrade performances of all the antennas to be the same as the antenna with the worst channel gain. Based on H.264/AVC and ParCast, a hybrid digital-analog...
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