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Emulation testbed. Left side acts as transmitter and right side acts as receiver. The device in the middle is the variable attenuator to manually adjust the channel attenuation 

Emulation testbed. Left side acts as transmitter and right side acts as receiver. The device in the middle is the variable attenuator to manually adjust the channel attenuation 

Source publication
Conference Paper
Full-text available
In this paper we consider a wireless multimedia system by mapping scalable video coded (SVC) bit stream upon superposition coded (SPC) signals, referred to as (SVC-SPC) architecture. Empirical experiments using a software-defined radio(SDR) emulator are conducted to gain a better understanding of its efficiency, specifically, the impact of the rece...

Contexts in source publication

Context 1
... emulators named CAASP-Tx and CAASP-Rx act as the transmitting base station and the receiving user device as shown in Figure 3. These emulators are implemented by National Instruments PXIe-1062Q chassis, with embedded controller PXIe-8130. IF transceiver PXIe-5641R, RF Up con- verter PXI-5610 for transmitter and RF Down converter PXI- 5600 for receiver. Both emulators are connected by two coaxial RF cable with a variable attenuator acting as the air channel with a predefined signal attenuation. The models of the two RF cables are CBL-3FT-SMSM+ and CBL-6FT-SMSM+ from Mini-Circuits with length 3ft and 6ft. The insertion loss of the cables is 1.0dB and 2.0dB respectively when the signal is in the range of 2.5-6GHz. The model of variable attenuation is 4674-30FS manufactured by ARRA. Although we could have used antennas between the two emulators, using a closed circuit with an attenuator ensures the repeatability of our experiment under all conditions and prevents interference from Table I shows the detailed system characteristics. 1) Average Symbol Energy in SCM: Power allocation ratio β cannot be directly configured in the system, instead the power boosting value can be changed from -12dB to +12dB stepped by one dB for controlling the power on base and enhancement layer separately. Therefore, we perform a simple calculation to transform the modulation and boosting into power allocation ...
Context 2
... emulators named CAASP-Tx and CAASP-Rx act as the transmitting base station and the receiving user device as shown in Figure 3. These emulators are implemented by National Instruments PXIe-1062Q chassis, with embedded controller PXIe-8130. ...

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... In the future, physical and/or link layer techniques can be considered to add in the algorithm to increase the accuracy on the estimation. Superposition coded multicasting (SCM) is one of the physical layer techniques that has been proved to solve the multiuser diversity problem [21]. It suggests suitable MCSs for broadcasting video in a cell, by considering both good and bad wireless channel conditions of all of the receivers. ...
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Traditional live television (TV) broadcasting systems are proven to be spectrum inefficient. Therefore, researchers propose to provide TV services on fourth-generation (4G) long-term evolution (LTE) networks. However, static broadcast, a typical broadcasting method over cellular network, is inefficient in terms of radio resource usage. To solve this problem, the audience-driven live TV scheduling (ADTVS) framework is proposed, to maximize radio resource usage when providing TV broadcasting services over LTE networks. ADTVS, a system-level scheduling framework, considers both available radio resources and audience preferences, in order to dynamically schedule TV channels for broadcasting at various time and locations. By conducting a simulation using real-life data and scenarios, it is shown that ADTVS significantly outperforms the static broadcast method. Numerical results indicate that, on average, ADTVS enables substantial improvement to broadcast efficiency and conserves considerable amount of radio resources, while forgoing less than 5% of user services compared to the benchmark system.
... Besides, researchers proposed cross-layer systems to reduce bandwidth consumption, such as superposition coded multicasting (SCM). In SCM, the base station (BS) superimposes two video streams, both good and fair quality streams of a video, in one radio signal to broadcast [7], [8]. Although this reduces the radio resource consumption for broadcasting multiple copies of the same video stream and ensure reliable receptions for users in various channel qualities, it does not reduce bandwidth for broadcasting multiple TV channels [9]. ...
... Besides, researchers proposed cross-layer systems to reduce bandwidth consumption, such as superposition coded multicasting (SCM). In SCM, the base station (BS) superimposes two video streams, both good and fair quality streams of a video, in one radio signal to broadcast [7], [8]. Although this reduces the radio resource consumption for broadcasting multiple copies of the same video stream and ensure reliable receptions for users in various channel qualities, it does not reduce bandwidth for broadcasting multiple TV channels [9]. ...