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- W2184033705 abstract "With the emergence of broadband fixed wireless access networks, there is an increasing interest in providing broadband video services over outdoor wireless networks. In this article we investigate some fundamental issues related to the broadcasting or multicasting of CBR MPEG-2 videos over fixed wireless channels in B-FWANs using FEC strategies. In B-FWANs, high-frequency wireless channels are used and a direct or indirect LOS propagation path is usually required between a transmitter and a receiver. The wireless channel is modeled b a K factor Rician fading model instead of a Rayleigh fading model. The unique ciaracteristics of the physical channel require special consideration at the system design level. In order to evaluate the overall system performance properly, a set of parameters for obiective video quality assessment is introduced and used in our simulation studies, including a definition of the objective grade oint value, the number of reconstructed frames, and the conventional peak signarto-noise ratio value. The feasibility of cell interleaving is also addressed. MPEG-2 control information (i.e., the control blocks) plays a critical role in the decoding process and can influence the reconstructed video quality dramatically; special consideration and excess protection should be given to this information. In this article the concept of a new FEC strategy, header redundancy FEC, is introduced to address this issue. In HRFEC, selected important (high-priority) MPEG-2 control blocks (such as sequence-header, sequence-extensions, and picture-header and corresponding extensions) are replicated before transmission, and duplicate copies are transmitted over the wireless link. Our results indicate that HRFEC is a simple, flexible, and effective error control strategy for broadcastin or multicasting MPEG-2 videos over error-prone and timevarying wireless channe a s." @default.
- W2184033705 created "2016-06-24" @default.
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- W2184033705 date "1998-01-01" @default.
- W2184033705 modified "2023-09-27" @default.
- W2184033705 title "Broadcas t/M ulticas t M PEG-2 Video over Broadband F ixea' Wireless Access Networks" @default.
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