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Considerable efforts to improve the performance of multicast communication have been rarely successful in wireless network due to wireless channel nature. In this paper, we propose a reliable multicast engine considering both QoS and throughput enhancement. It includes 1) Application-layer Hybrid FEC/ARQ, 2) Adaptive FEC code rate control, 3) Feedback implosion avoidance, 4) Low-latency fast retransmission,...
Video transmission over wireless network has to face many challenges due to varying channel conditions and limited network resources. To achieve reliable transmission as well as high throughput efficiency over lossy wireless channels, a network coding/ARQ hybrid error-control scheme is developed in this paper. Different form the traditional methods, the proposed scheme takes both the reliability and...
This paper presents an alternative Forward Error Correction scheme, based on Reed-Solomon codes, with the aim of protecting the transmission of RTP-multimedia streams: the inter-packet symbol approach. This scheme is based on an alternative bit structure that allocates each symbol of the Reed-Solomon code in several RTP-media packets. This characteristic permits to exploit better the recovery capability...
Providing efficient and reliable data transport is a challenging problem for a variety of emerging applications which require reliable data packet delivery in wireless networks. In this paper, we propose to incorporate erasure codes at transport layer in the notion of cooperative relay communications to provide reliability and robustness for data transport in wireless networks. Our basic idea is to...
Providing reliable and high quality video over wireless networks is extremely challenging task due to unstable wireless nature. Scalable Video Coding (SVC) is very vulnerable to channel disturbance when transmitted over error-prone wireless channels. Conventional Forward Error Correcting (FEC) codes and retransmission solutions will become less effective while streaming SVC over wireless networks...
The tolerable packet-loss ratio of an Internet Protocol (IP) based wireless networks varies according to the specific services considered. File transfer for example must be error free but tolerates higher delays, whereas maintaining a low delay is typically more important in interactive Voice Over IP (VOIP) or video services. Classic Forward Error Correction (FEC) may be applied to the data to provide...
Video streaming applications over wireless networks present many challenges owing to the high packet error rate and the error characteristics of consecutive packets. In order to solve these problems, this paper proposes a cross-layer Unequal Error Protection (UEP) Forward Error Correction (FEC) mechanism with an interleaved strategy for video streaming over wireless networks. The proposed novel UEP...
With the increase of the demands of mobile multimedia services, the real-time multimedia services such as IPTV often require the support of Mobile Multimedia Multicast (MMM) communications in the IP-based wireless networks. Since the MMM services often require a strict delay-bounded transport that guarantees quasi error free (QEF) transmission, we will investigate how to satisfy the QEF requirements...
In this paper we study a two-hop cooperative transmission scheme where multiple relays forward the data simultaneously using Randomized Distributed Space Time Codes (R-DSTC). We propose to integrate this randomized cooperative transmission with layered video coding and packet level Forward Error Correction (FEC) to enable error resilient video multicast. Data rates in both hops as well as the FEC...
The need for covert communication in tactical battlefields has developed the ideas of low probability of intercept (LPI) networks. Spread spectrum communication is used for LPI communication. Multicarrier CDMA is a new type of spread spectrum technique that has been developed in recent years. Most of the works in MC-CDMA are focused on finding out BER performance of it when different users share the...
Wireless network coding (WNC) has been considered as a promising solution with its capability of improving the overall performance of wireless mesh networks. A problem caused when WNC is employed in multi-rate wireless networks is that the link status between the relay node and intended receivers of a coded packet is mutually different. Even though there are links that support higher transmission...
Robust streaming of video over wireless networks poses many challenges, as coping with bandwidth variations,data losses, and heterogeneity of the receivers. Rate-distortion (RD) optimization studies are aimed at increasing the reliability of received bitstreams, by selecting the opportunistic system parameters based on the channel conditions and the RD curve. One of the main challenges in the RD optimization...
Hybrid ARQ is deployed in error prone wireless network to provide reliable unicast transmission with the positive or negative acknowledgement report. However, the feedback implosion is a challenging problem for multicast service, wherein multiple receivers send out feedback in a short period of interval. The traditional representative-based or timer-based feedback suppression method can not provide...
We consider multiple source asynchronous broadcasting problem. That is, in each broadcast, one of the nodes is the source, and the message is to be received, unaltered, by all the other nodes in the network. We propose to exploit LT code, which is one of the fountain codes, with the source independent backbone in order to reduce the number of transmissions for broadcasting with network coding in ad...
We devise an adaptive fault-tolerant scheme based on the exponentially weighted moving average (EWMA) which can provide fault tolerant in sensor networks and balance between traffic overhead and transmission failure. We use the multipath routing to transmit packets, and according to wireless network environments we adaptively change the required number of paths for transmission. So it can achieve...
A new network transmission framework highlighting the concept of cross-layer co-design for packet loss reduction is presented in this article. The proposed framework takes into account the correlation between the packet loss rate and the packet size under a given channel condition, and assigns different tasks to layers involved: physical/ MAC layer for monitoring current channel statuses, IP layer...
Media-based services often require a multicast-enabled transport that guarantees quasi error free transmission under strict delay constraints. In packet based networks, furthermore, both multicast and delay constraints deeply influence the architecture of erasure error recovery. Therefore, we propose a general architecture and study its optimization in this paper. Since the Gilbert-Elliot (GE) erasure...
We report the design, implementation and evaluation of Merged Hybrid ARQ with staggered FEC (MHARQ) system for video multicast over wireless LANs. MHARQ combines the advantages of receiver-driven staggered FEC and hybrid ARQ schemes to compensate the large dynamic range of WLAN channels and to achieve high reliability, scalability and wireless bandwidth efficiency for video multicast. The FEC packets...
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