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In this work, we propose an effective live video streaming system, which exploits path diversity over heterogeneous wireless networks. Basically, fountain code is employed to efficiently integrate multiple paths and provide the error resilience for the live video streaming of high quality. In the proposed system, the path selection algorithm is designed to maximize the target video encoding rate while...
This paper is about the scheme to provide additional service on mobile terminal device by using mobile IPTV system. In this paper, we represent system and packet structure to realize additional service of mobile IPTV.
In this paper, we propose a load balancing scheme for heterogeneous multiple AS (Application Server) system in IMS (IP Multimedia Subsystem) network. In IMS network, S-CSCF (Serving Call Session Control Function) utilizes iFC(initial Filter Criterion) downloaded by HSS(Home Subscriber Server) and generates service trigger through the SIP message. To perform load balancing among multiple AS with different...
Today's 802.11-based wireless network interface cards (WNICs) can leverage multiple transmission rates to exploit various and dynamic channel conditions. Some link adaptation schemes (LASs) in the literature have been shown to adapt well to dynamic channel conditions, thereby achieving high link throughput. However, routing protocols unaware of the underlying LAS may achieve low end-to-end throughput...
In this paper we propose a throughput performance model for IEEE 802.11 wireless network with network coding. Specifically, we consider IEEE DEC protocol and linear topology in which traffic sources are located at both ends and intermediate nodes act as relays with a coding rule. Numerical results show that our analytic model is sufficiently accurate and can be utilized in design of IEEE 802.11 wireless...
In the cellular systems, the performance can be severely degraded if the loads are imbalanced among cells. We consider a joint optimization of association control and beamforming to maximize a system-wide utility function as a means to balance the load across multiple cells. The beamforming weight vector can be adapted as the channel status varies, but it is not practical to change the user association...
The signal path loss characteristics of the human body channel are dependent on the transmission distance and the ground plate size of both the transmitter and the receiver. We investigate the magnitude response of the path loss channel model based on measurement and compute the compatible transmitter power for the communication link when frequency selective digital transmission is used.
In this paper, we propose a new modulation scheme for low power and high performance WBAN in-body communication systems. Simulation results are presented in terms of performance and transmit power. The proposed modulation scheme is more appropriate for high data rate human body applications than other schemes due to the better characteristic of spectral re-growth in the non-linear system environment...
This paper presents non-coherent synchronization method for UWB WBAN systems. The non-coherent synchronization including packet detection and SFD detection is described and packet error rate performance in AWGN is provided. Finally, we make a conclusion in view of the implemental aspect.
Ultra-wideband (UWB) technology has received great attention in recent short-range communication systems and been considered one of the potential candidates for upcoming IEEE 802.15.6 body area network (BAN) standard. High penetration capability and high precision ranging with a wide bandwidth of up to 7.5GHz (from 3.1GHz to 10.6GHz) make it easy to image the organs of human body for biomedical applications...
In this paper, we propose signal-modeling of the block-coded group pulse position modulation (BC-GPPM) for the wireless body area network (WBAN). The BC-GPPM is one of modulation methods for the WBAN application taking the technical requirements such as data-rate scalability, low complexity and low-power. This paper describes concept of WBAN non-coherent standard related to BC-GPPM and proposes a...
We derive a spherical linear interpolation (SLI) with a closed-form phase term. The derived SLI is compared with the geodesic interpolation. Simulation results show that both schemes are efficient and similar when the channels are highly correlated, since their objectives are equivalent in a sense of minimizing the distance between two adjacent codewords.
Iterative signal detection based on energy spreading transform (EST) in multiple input multiple output systems has been shown to perform close to the genie bound with the complexity of linear receivers. In this paper, we consider a transmit antenna selection scheme for the EST based iterative receiver and propose some transmit selection criteria. Simulation results are provided to verify the usefulness...
This paper addresses signal detection problems for orthogonal space-time block codes (OSTBC) without a transceiver signal linearization property, especially when a quasi-static channel condition does not hold. By augmenting transceiver a model with its complex conjugate, well-established multiple-input multiple-output (MIMO) detection techniques become applicable for the problem. We consider zero-forcing...
Developing of low complex and high performance detection algorithms are challenging. In this paper, we introduce the ordered successive interference cancellation (OSIC) scheme with MMSE in UWB-MIMO system. Especially we use MMSE, OSIC, RAKE combination to evaluate the performance of UWB-MIMO system in multipath environment. We compare the performance result based on the number of multipath and number...
This paper proposes a reference vector selection diversity method of subspace interference alignment systems to obtain higher sum rate capacity. The proposed method calculates sum-rate capacities and selects the best reference vector to increase the total sum rate. Simulation result shows that the proposed method increases the sum-rate compared with a previous method.
Interference limits the throughput of a mobile ad hoc network (MANET). Multi-antennas can be employed at a node for interference cancellation besides attaining array gain. Spatial interference cancellation requires each node to estimate the interference channels, which is potentially inaccurate due to node mobility. As a result, maximizing the network capacity requires optimally allocating spatial...
Adaptive Bit Loading (ABL) in Multiple-Input Multiple-Output Orthogonal Frequency-Division Multiplexing (MIMO-OFDM) is most likely used for achieving the desired Bit Error Rate (BER) performance in wireless systems. In this paper, we discuss some of the bit loading algorithms, compare them with respect to their BER performance, and present an effective concise Adaptive Grouped Loading (AGL) algorithm...
We propose an improved timing estimation method for orthogonal frequency-division multiplexing (OFDM) systems that employ a preamble with time-domain repetitive patterns. The proposed method exploits the unique correlation property of the preamble including its cyclic prefix. Numerical results show that the proposed scheme is robust in fading multipath channels, achieving better performance than the...
Introduce adaptive bit loading technique into orthogonal frequency division multiplexing (OFDM) system can highly improve system performance in frequency selective fading channel. However, similar with ordinary OFDM system, this system is very sensitive to carrier frequency offset (CFO) and phase noise. When CFO and phase noise exist, common phase error (CPE) as well as inter carrier interference...
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