CableLabs

About: CableLabs is a based out in . It is known for research contribution in the topics: Signal & Wireless. The organization has 237 authors who have published 452 publications receiving 5467 citations.

Social Networks that Matter: Twitter Under the Microscope

Abstract: Scholars, advertisers and political activists see massive online social networks as a representation of social interactions that can be used to study the propagation of ideas, social bond dynamics and viral marketing, among others. But the linked structures of social networks do not reveal actual interactions among people. Scarcity of attention and the daily rythms of life and work makes people default to interacting with those few that matter and that reciprocate their attention. A study of social interactions within Twitter reveals that the driver of usage is a sparse and hidden network of connections underlying the "declared" set of friends and followers.

Multiple-input multiple-output (mimo) communication system

Abstract: A multiple-input multiple-output (MIMO) capable system is contemplated. The communication system may include a signal processor configured to separate an input stream into multiple signal paths to facilitate simultaneous transport through a communication medium. The capability to simultaneously transmit multiples signal paths may be beneficial in order to maximize throughput and/or minimize expense.

The Nature of Markets in the World Wide Web

Abstract: We studied the statistics in the number of visitors to sites of the World Wide Web by examining usage logs covering one hundred and twenty thousand sites. We found out that both in the case of all sites and sites in specific categories, the distribution of visitors per site follows a universal power law, characteristic of winner-take-all markets. We developed a dynamical theory of site popularity which takes into account the stochastic nature of user decisions to visit given sites as well as the fact that newer sites are appearing at an ever increasing rate. The model accounts for the observed power law behavior and naturally provides the amplification factor responsible for the increased performance of the top performers.

System for distributing radio telephone signals over a cable television network

Abstract: A system for distributing remote telephone traffic between a base station and remote antenna site is disclosed. The base station and remote antenna sites are connected via a cable television network. The base station receives from a public telephone network parallel channels of outbound voice signals for radio telephones operating within the cellular areas of the remote antenna sites. The base station will digitize and time compress each of these outbound telephone signals, and insert them in a transmit frame. The transmit frame is modulated on a subcarrier and applied to the cable television network. A plurality of remote sites are connected to the cable television network and receive and rebroadcast digitized voice signals to radio telephones operating within their cellular areas. Inbound serial channel data received from a radio telephone is inserted in a serial receive data frame. A second subcarrier is modulated with the receive data frame and applied to the cable television network for transmission upstream to the base station. The base station will demodulate the inbound receive frame and apply the digitized voice signals to the public telephone network to complete a telephone communication link.

Multiple user access method using OFDM

Abstract: A communication method enables a plurality of remote locations to transmit data to a central location. The remote locations simultaneously share a channel and there is a high degree of immunity to channel impairments. At each remote location, data to be transmitted is coded by translating each group of one or more bits of the data into a transform coefficient associated with a frequency in a particular subset of orthonormal baseband frequencies allocated to each remote location. The particular subset of orthonormal baseband frequencies allocated to each location is chosen from a set of orthonormal baseband frequencies. At each remote location, an electronic processor performs an inverse orthogonal transform (e.g., an inverse Fourier Transform) on the transform coefficients to obtain a block of time domain data. The time domain data is then modulated on a carrier for transmission to the central location. Preferably, the time intervals for data transmission at the different remote locations are aligned with each other. In one embodiment of the invention, all of the baseband frequencies are allocated to a single particular remote location for one time slot. At the remote location, data is received from a plurality of remote locations. The data is demodulated to obtain baseband time domain data. The orthogonal transform is performed on this data to obtain transform coefficients. Each transform coefficient is associated with a baseband frequency. The central location keeps track of which baseband frequencies are allocated to which remote location for subsequent translation of each transform coefficient.