PPT-Convolutional Codes COS 463 : Wireless Networks Lecture

Convolutional Codes COS 463 Wireless Networks Lecture 9 Kyle Jamieson Parts adapted from H Balakrishnan So far weve seen block codes Convolutional Codes Simple design especially at the transmitter. 6-. 1. Chapter 6. Wireless and Mobile Networks. Computer Networking: A Top Down Approach . 4. th. edition. . Jim Kurose, Keith Ross. Addison-Wesley, July 2007. . Computer Networking: A Top Down Approach . 6-. 1. TCP over ATM:. UBR: for delay-tolerant applications . e.g., ftp, telnet. ABR: . for delay sensitive applications, e.g., on-line sessions. provides explicit congestion signaling. TCP over UBR:. Neural . Network Architectures:. f. rom . LeNet. to ResNet. Lana Lazebnik. Figure source: A. . Karpathy. What happened to my field?. . Classification:. . ImageNet. Challenge top-5 error. Figure source: . Last time. Linear classifiers on pixels bad, need non-linear classifiers. Multi-layer . perceptrons. . overparametrized. Reduce parameters by local connections and shift invariance => Convolution. 6-. 1. Chapter 6. Wireless and Mobile Networks. Computer Networking: A Top Down Approach . 4. th. edition. . Jim Kurose, Keith Ross. Addison-Wesley, July 2007. . Computer Networking: A Top Down Approach . Convolutions. Reduce parameters. Capture shift-invariance: location of patch in image should not matter. Subsampling. Allows greater invariance to deformations. Allows the capture of large patterns with small filters. EE 122: Intro to Communication Networks. . Materials with thanks to . Scott Shenker, . Jennifer Rexford, Ion Stoica, Vern Paxson. and other colleagues at Princeton and UC Berkeley. 2. 3. Metrics for evaluation / comparison of wireless technologies. Introduction. Jon Pollock. Senior Network Engineer. Glade Creek Technology. Wireless Concepts. Wireless networks are made of low frequency light. It can help to think of an Access Point as a light bulb. Convolutional Codes COS 463 : Wireless Networks Lecture 9 Kyle Jamieson [Parts adapted from H. Balakrishnan ] So far, we’ve seen block codes Convolutional Codes: Simple design, especially at the transmitter .. Wireless is Global. The standard radio frequencies run in the range of 3Hz to 300 GHz. There is other frequencies used for example the 222 MHz through 225 MHz is for amateur radio. If your interested in what frequencies your country is using for what? Take a look at the frequencies. 6-. 1. Chapter 6. Wireless and Mobile Networks. Computer Networking: A Top Down Approach Featuring the Internet. , . 6. th. . edition. . Jim Kurose, Keith Ross. Addison-. Wesley. A note on the use of these . person. grass. trees. motorbike. road. Evaluation metric. Pixel classification!. Accuracy?. Heavily unbalanced. Common classes are over-emphasized. Intersection over Union. Average across classes and images. n,k. ) code by adding the r parity digits. An alternative scheme that groups the data stream into much smaller blocks k digits and encode them into n digits with order of k say 1, 2 or 3 digits at most is the convolutional codes. Such code structure can be realized using convolutional structure for the data digits.. Kannan . Neten. Dharan. Introduction . Alzheimer’s Disease is a kind of dementia which is caused by damage to nerve cells in the brain and the usual side effects of it are loss of memory or other cognitive impairments..