Modify and control volume levels, effects, noise and playback of auto content by launching the application and selecting the type of media to process: music, movie audio, gaming audio, etc. The app then customizes speaker or headphone signal strength.
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Compatible with virtually every PC-based media player, HAL is the ultimate audio enhancement software suite for the PC. HAL allows the user to select audio content (e.g. music, movie or game) and then choose the speaker type (eg: headphone, internal notebook speakers or external speakers) to dial in amazing sound tailored for your listening preference.
Compatible with virtually every PC-based media player, HAL is the ultimate audio enhancement software suite for the PC. HAL allows the user to select audio content (e.g. music, movie or game) and then choose the speaker type (eg: headphone, internal notebook speakers or external speakers) to dial in amazing sound tailored for your listening preference.
Ralph Tanbourgi, Sarabjot Singh, Jeffrey G. Andrews, Friedrich K. Jondral:A Tractable Model for Noncoherent Joint-Transmission Base Station Cooperation IEEE Transactions on Wireless Communications, vol.13, no.9, pp.4959 - 4973, Sept. 2014Abstract:Base station (BS) cooperation is set to play a key role in managing interference in dense heterogeneous cellular networks (HCNs). Non-coherent joint transmission (JT) is particularly appealing due to its low complexity, smaller overhead, and ability for load balancing. However, a general analysis of this technique is difficult mostly due to the lack of tractable models. This paper addresses this gap and presents a tractable model for analyzing non-coherent JT in HCNs, while incorporating key system parameters such as user-centric BS clustering and channel-dependent cooperation activation. Assuming all BSs of each tier follow a stationary Poisson point process, the coverage probability for non-coherent JT is derived. Using the developed model, it is shown that for small cooperative clusters of small-cell BSs, non-coherent JT by small cells provides spectral efficiency gains without significantly increasing cell load. Further, when cooperation is aggressively triggered intra-cluster frequency reuse within small cells is favorable over intra-cluster coordinated scheduling.[ back to overview]
Ralph Tanbourgi, Sarabjot Singh, Jeffrey G. Andrews, Friedrich K. Jondral:Analysis of Non-Coherent Joint-Transmission Cooperation in Heterogeneous Cellular NetworksIEEE International Conference on Communications (ICC), Sidney, Australia, June 10 - 14, 2014Abstract:Base station (BS) cooperation is set to play a key role in managing interference in dense heterogeneous cellular networks (HCNs). Non-coherent joint transmission (JT) is particularly appealing due to its low complexity, smaller overhead, and ability for load balancing. However, a general analysis of this technique is difficult mostly due to the lack of tractable models. This paper addresses this gap and presents a tractable model for analyzing non-coherent JT in HCNs, while incorporating key system parameters such as user-centric BS clustering and channel-dependent cooperation activation. Assuming all BSs of each tier follow a stationary Poisson point process, the coverage probability for non-coherent JT is derived. Using the developed model, it is shown that for small cooperative clusters of small-cell BSs, non-coherent JT by small cells provides spectral efficiency gains without significantly increasing cell load. Further, when cooperation is aggressively triggered intra-cluster frequency reuse within small cells is favorable over intra-cluster coordinated scheduling.[ back to overview]
Rainer Moorfeld, Adolf Finger, Hanns-Ulrich Dehner, Holger Jäkel, Friedrich K. Jondral:Performance of a high flexible non-coherent multiband impulse radio UWB systemProceedings of 9th IASTED International Conference on Wireless and Optical Communications (WOC09), Juli 2009Abstract:This paper demonstrates the performance of a multiband impulse radio architecture with a non-coherent energy detection receiver in the IEEE802.15.3a channel model. Frequency dependent attenuation due to free space path loss leads to a significant performance degradation of any UWB system. The flexibility of the multiband impulse radio architecture in conjunction with a dynamic subband deactivation algorithm allows to fight this performance degradation. Furthermore an approximated log-likelihood ratio calculation for a non-coherent energy detector is introduced. Link budget calculations show the performance of different configurations of the proposed architecture.[ back to overview]
Timo Weiss, Joerg Hillenbrand, Albert Krohn, Friedrich K. Jondral: Mutual Interference in OFDM-based Spectrum Pooling SystemsIEEE Vehicular Technology Conference, 17.-19. Mai 2004. CD-ROM. VTC Spring 2004, Milan, ItalyAbstract:Public mobile radio spectrum has become a scarce resource while wide spectral ranges are only rarely used. Here, a new strategy called \emphspectrum pooling is considered. It aims at enabling public access to these spectral ranges without sacrificing the transmission quality of the actual license owners. Unfortunately, using OFDM modulation in a spectrum pooling system has some drawbacks. There is an interaction between the licensed system and the OFDM based rental system due to the non-orthogonality of their respective transmit signals. In this paper, this interaction is described mathematically providing a quantitative evaluation of the mutual interference that leads to an SNR loss in both systems. However, this interference can be mitigated by windowing the OFDM signal in the time domain or by the adaptive deactivation of adjacent subcarriers providing flexible guard bands between licensed and rental system. It is obvious that both approaches sacrifice bandwidth of the rental system. A quantitative comparison of both approaches is given as a tradeoff between interference reduction and throughput in the rental system.[ back to overview ]
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