Biologcally-inspired optimal video streaming over unpredictable wireless channel

Recently there has been an alarming increase in demand for wireless video streaming and the need to provide the required quality of service (QoS) to support video applications is very crucial. It is obvious that supporting multimedia applications and services over wireless is very challenging task due to network heterogeneity and different QoS requirements. This requires low complexity and highly efficient optimization scheme to cope with the unpredictable channel condition. This paper is aimed at developing a biologically-inspired scheme using particle swarm optimization (PSO) to achieve optimal video streaming. The optimal parameters configuration selected provide the best settings to enhance the video streaming quality over wireless LAN. The scenario has been simulated in NS-2 environment, it clearly shows that the video quality has been improve by selecting best configuration to ultimately support video application. The PSO-based approach outperforms other techniques used to compare the performance of the develop scheme in terms of perceived video quality by more than 0.5dB. The experimental simulation has been used to verify the efficiency and potential application of the PSO in wireless multimedia networks

Ein Blick in die Blase—der Mensch dahinter

Zusammenfassung: Der Blick ins Innere des Menschen ist ein alter Wunsch in der Medizin. Die Entwicklung der Zystoskopie ist den dafür Interessierten bekannt. Nachfolgend steht diese Untersuchung nicht im Zentrum des Blickpunktes, sondern die Menschen, die dahinter stehen, die ihre Energien und ihre Phantasie einsetzen, um das einmal Erreichte zu verbessern. Dabei kommt man nicht darum herum, über Menschliches—Allzumenschliches—zu berichte

Optimizing achievable throughput for cognitive radio network using swarm intelligence

Cognitive radio (CR) technology allows a secondary or cognitive user (CU) to opportunistically access frequency band of a primary user (PU) when it is not in use. However, a CU needs to perform spectrum sensing periodically to avoid causing harmful interference and thereby protecting the quality of service of PUs. A conventional frame structure for CR operation consists of sensing time slot and data transmission time slot which run consecutively. Basically, a longer sensing time produces a higher probability of detection and therefore, better PU protection. However, longer sensing time will reduce the amount of time for data transmission and hence affects the achievable throughput of a CU. In this paper, we study the fundamental tradeoff between sensing time and achievable throughput of the CUs. Based on energy detection scheme, we propose and investigate the feasibility of using Particle Swarm Optimization (PSO) in the design of sensing slot duration to maximize the achievable throughput for CUs for a given frame duration. The results show an encouraging 8.89% increase in throughput with respect to the probability of false alarm, a reduced sensing time by 80% while achieving 97.8% of normalized throughput for CU system with PSO

Mobile streaming of H.264 video over gilbert - elliotts channel

Mobile multimedia applications are becoming increasingly popular in recent years due to explosive growth in demand for such services in both wired and wireless network. Undoubtedly, future wireless communication systems will eventually integrated a broad range of multimedia services such as voice, video, and data. Video applications play an extremely important role in surveillance, entertainment and remote monitoring. It is very obvious that achieving more reliable and efficient multimedia communication over wireless channel is challenging due to unpredictable channel condition, fading and multipath. In this paper, we investigate the impact of the channel condition on packet loss and percieve video quality. The scenario has been simulated and analysed base on Gilbert channel model, and it is primarily due to the fact it gives more realistic representation of the bursty channel such as wireless medium