IEEE Transactions on Microwave Theory and Techniques, 2006
We present a state-space dynamic neural network (SSDNN) method for modeling the transient behavio... more We present a state-space dynamic neural network (SSDNN) method for modeling the transient behaviors of high-speed nonlinear circuits. The SSDNN technique extends the existing dynamic neural network (DNN) approaches into a more generalized and robust formulation. For the first time, stability analysis methods are presented for neural modeling of nonlinear microwave circuits. We derive the stability criteria for both the local stability and global stability of SSDNN models. Stability test matrices are formulated from SSDNN internal weight parameters. The proposed criteria can be conveniently applied to the stability verification of a trained SSDNN model using the eigenvalues of the test matrices. In addition, a new constrained training algorithm is introduced by formulating the proposed stability criteria as training constraints such that the resulting SSDNN models satisfy both the accuracy and stability requirements. The validity of the proposed technique is demonstrated through the transient modeling of high-speed interconnect driver and receiver circuits and the stability verifications of the obtained SSDNN models.
In case you haven't noticed, multimedia communication over IP and wireless networks is exploding.... more In case you haven't noticed, multimedia communication over IP and wireless networks is exploding. Applications such as BitTorrent, used primarily for video downloads, now take up the lion's share of all traffic on the Internet. Music file sharing, once on the legal cutting edge of massive copyright infringement on college campuses around the world, has moved into the mainstream with significant legal downloads of music and video to devices such as the iPod and numerous other portable media players. Multimedia podcasting to client computers and portable devices is a phenomenon exploding in its own right. Internet radio, pioneered in the late 1990's, is now being joined in a big way by peer-to-peer television such as CoolStreaming and PPLive. Audio and video on demand over the Internet, also available since the late 1990's on the web sites of well-funded organizations such as CNN.com and MSNBC.com, are now at the core of a multitude of new music and video businesses from Napster to iTunes to MTV's Urge service, and will be expanding imminently to full-length movie delivery on demand. Moreover, web sites such as YouTube have made publishing videos on demand available to anyone with a home video camera, which these days, is nearly everyone with a mobile phone. Indeed, most mobile phones today can actively download and upload both photos and videos, sometimes in real time. Internet telephony is exploding, with popular applications such as Skype and others enabling wideband voice and video conferencing over the Internet. In general, voice over IP (VoIP) is revolutionizing the telecommunications industry, as circuit-switched equipment from PBX to long haul equipment is being replaced by soft IP switches. Enhanced television is also being delivered into the living room over IP networks by traditional telephone providers through DSL. Once inside the home, consumer electronics manufacturers, and increasingly, the computer industry and its partners, are distributing audio and video over WiFi to monitors and speaker systems around the house. Now that the analog-to-digital revolution is nearly complete, we are undergoing an all-media-over-IP revolution, with radio, television, telephony, and stored media all currently being delivered over IP wireline and wireless networks. To top it all off, brand new types of media, such as game data for interactive gaming over the Internet, are strongly emerging.
IEEE Transactions on Microwave Theory and Techniques, 2006
We present a state-space dynamic neural network (SSDNN) method for modeling the transient behavio... more We present a state-space dynamic neural network (SSDNN) method for modeling the transient behaviors of high-speed nonlinear circuits. The SSDNN technique extends the existing dynamic neural network (DNN) approaches into a more generalized and robust formulation. For the first time, stability analysis methods are presented for neural modeling of nonlinear microwave circuits. We derive the stability criteria for both the local stability and global stability of SSDNN models. Stability test matrices are formulated from SSDNN internal weight parameters. The proposed criteria can be conveniently applied to the stability verification of a trained SSDNN model using the eigenvalues of the test matrices. In addition, a new constrained training algorithm is introduced by formulating the proposed stability criteria as training constraints such that the resulting SSDNN models satisfy both the accuracy and stability requirements. The validity of the proposed technique is demonstrated through the transient modeling of high-speed interconnect driver and receiver circuits and the stability verifications of the obtained SSDNN models.
In case you haven't noticed, multimedia communication over IP and wireless networks is exploding.... more In case you haven't noticed, multimedia communication over IP and wireless networks is exploding. Applications such as BitTorrent, used primarily for video downloads, now take up the lion's share of all traffic on the Internet. Music file sharing, once on the legal cutting edge of massive copyright infringement on college campuses around the world, has moved into the mainstream with significant legal downloads of music and video to devices such as the iPod and numerous other portable media players. Multimedia podcasting to client computers and portable devices is a phenomenon exploding in its own right. Internet radio, pioneered in the late 1990's, is now being joined in a big way by peer-to-peer television such as CoolStreaming and PPLive. Audio and video on demand over the Internet, also available since the late 1990's on the web sites of well-funded organizations such as CNN.com and MSNBC.com, are now at the core of a multitude of new music and video businesses from Napster to iTunes to MTV's Urge service, and will be expanding imminently to full-length movie delivery on demand. Moreover, web sites such as YouTube have made publishing videos on demand available to anyone with a home video camera, which these days, is nearly everyone with a mobile phone. Indeed, most mobile phones today can actively download and upload both photos and videos, sometimes in real time. Internet telephony is exploding, with popular applications such as Skype and others enabling wideband voice and video conferencing over the Internet. In general, voice over IP (VoIP) is revolutionizing the telecommunications industry, as circuit-switched equipment from PBX to long haul equipment is being replaced by soft IP switches. Enhanced television is also being delivered into the living room over IP networks by traditional telephone providers through DSL. Once inside the home, consumer electronics manufacturers, and increasingly, the computer industry and its partners, are distributing audio and video over WiFi to monitors and speaker systems around the house. Now that the analog-to-digital revolution is nearly complete, we are undergoing an all-media-over-IP revolution, with radio, television, telephony, and stored media all currently being delivered over IP wireline and wireless networks. To top it all off, brand new types of media, such as game data for interactive gaming over the Internet, are strongly emerging.
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