259 results about "IMT Advanced" patented technology

A discrete multitone stacked-carrier spread spectrum communication method is based on frequency domain spreading including multiplication of a baseband signal by a set of superimposed, or stacked, complex sinusoid carrier waves. In a preferred embodiment, the spreading involves energizing the bins of a large Fast Fourier transform (FFT). This provides a considerable savings in computational complexity for moderate output FFT sizes. Point-to-multipoint and multipoint-to-multipoint (nodeless) network topologies are possible. A code-nulling method is included for interference cancellation and enhanced signal separation by exploiting the spectral diversity of the various sources. The basic method may be extended to include multielement antenna array nulling methods for interference cancellation and enhanced signal separation using spatial separation. Such methods permit directive and retrodirective transmission systems that adapt or can be adapted to the radio environment. Such systems are compatible with bandwidth-on-demand and higher-order modulation formats and use advanced adaptation algorithms. In a specific embodiment the spectral and spatial components of the adaptive weights are calculated in a unified operation based on the mathematical analogy between the spectral and spatial descriptions of the airlink.

A system and method of advanced identification information to be created and distributed to users of wireless communication devices, such as mobile phones. Subscribers can define their own personas as collections of information which define the users. Subscribers can then publish their persona(s) to their friends' and associates' mobile phones, and update the others' address books with the subscriber's contact information. Users can specify different personas to be presented to different users.

A wireless device (e.g., a wireless smart phone) uses Global Positioning System (GPS) data, or other position-indicating data, to accurately determine its location in relation to multi-layered wireless networks that the device may see concurrently. If location information is available, the device employs a user-defined priority table to select the order of user-contracted networks available at that location in which the device will register. If location information is unavailable, the device employs a technology priority table to select Common Air Interface (CAI) options for the invention device radio parameters (e.g., GSM, cdma2000, IS-136, IEEE 802.11x, etc.) to search for an available network to access. Information is gathered and stored in databases within the invention device allowing it to be registered in multiple wireless networks. The inventive device provides unique access codes to each wireless network with which a user has contracted, without the intervention of any “anchor” (home) network. The invention facilitates equivalent “home”, or personalized, service in any network by using these features for automatic technology adaptation. This allows the invention device to receive service as if it is in a “home” network no matter what network it is traveling through. The invention provides a ubiquitous experience allowing the user to traverse multiple wireless networks with seamless access to multiple systems and services provided by those networks. It also provides a platform to facilitate the customization of wireless services for business customers.