41 results about "Channel adaptation" patented technology

The voice print system of the present invention is a subword-based, text-dependent automatic speaker verification system that embodies the capability of user-selectable passwords with no constraints on the choice of vocabulary words or the language. Automatic blind speech segmentation allows speech to be segmented into subword units without any linguistic knowledge of the password. Subword modeling is performed using a multiple classifiers. The system also takes advantage of such concepts as multiple classifier fusion and data resampling to successfully boost the performance. Key word / key phrase spotting is used to optimally locate the password phrase. Numerous adaptation techniques increase the flexibility of the base system, and include: channel adaptation, fusion adaptation, model adaptation and threshold adaptation.

Systems, devices and methods for updating link adaptations in multi-carrier modulated signals between an access point (AP) and a wireless local area network (WLAN) station (STA) include (are configured for) periodically transmitting a channel sounding signal from the AP. The STA receives each unsolicited channel sounding signal and evaluates the current channel conditions between the AP and STA. The AP adjusts a rate of transmission of the channel sounding signals in accordance with the channel coherence time so that the channel estimates performed by the STA will be valid within the time varying characteristics of the channel. Depending on the length of the coherence time for network environment, the channel sounding signals may be AP beacons, low overhead signal fragments with no payload, or a combination of both.

A method, apparatus and system relate to detecting an interfering device in a wireless network such as a wireless local area network (WLAN). In wireless networks using orthogonal frequency division multiplexing (OFDM) and adaptive bit loading (ABL), adaptive modulation information should be somewhat symmetric in uplink and downlink directions. By comparing modulation adaptations in the uplink and downlink directions of a communication channel between at least two terminals, identified differences can indicate the presence of a potential interferer in the wireless network. A location of the potential interferer can be estimated if a location of one or more network terminals experiencing interference is known or can be determined. An exemplary implementation for a device of the invention may be as an Access Point (AP) in the WLAN.

The present invention relates to transmissions and retransmissions in a communications system. It reveals a method and system for backward compatible detection of an introduced channel sub-frame structure particularly well suited for data transmissions. The invention is well suited for a cellular mobile radio communications system, particularly a Universal Mobile Telecommunications System, UMTS.

An apparatus having a transmitter is disclosed. The transmitter generally has a filter coupled to a communication channel. The transmitter may be configured to adjust the filter using information based on an estimate of one or more characteristics of the communication channel.

Disclosed is a technique for updating a read-detect channel. A signal is processed in a read-detect channel that has one or more programmable registers. While signals continue to be processed by the read-detect channel, it is determined with a channel auxiliary processor whether to dynamically replace values of the one or more programmable registers. When it is determined that values of the one or more programmable registers are to be replaced, a channel auxiliary processor determines values for the one or more programmable registers and replaces existing values for the one or more programmable registers with the determined values.

The present invention discloses a base station antenna selection method, a base station antenna selection apparatus, a multi-antenna channel self-adaptation method, a multi-antenna channel self-adaptation apparatus, and a base station. According to the invention, the antenna covering capability is ensured and the multi-stream data transmission performance is improved at the same time. The base station antenna selection method includes: N antenna channels satisfying a preset interval condition are selected from base station antennas for performing multi-stream beam forming for a terminal when the multi-stream data transmission is required by the terminal. The multi-antenna channel self-adaptation method includes the steps as follows: transmitting CSI-RS measurement instruction information to the terminal; confirming that the terminal supports the multi-stream data transmission, and selecting N antennal channels satisfying the preset interval condition for performing multi-stream beam forming for the terminal when the terminal performs measurement according to a CSI-RS with four ports; reconfiguring the terminal for performing measurement according to the CSI-RS with four ports if the terminal performs measurement according to a CSI-RS with eight ports, and selecting N antenna channels satisfying the preset interval condition for performing multi-stream beam forming for the terminal according to second channel information fed back by the terminal.