Patent application number | Description | Published |
20100183106 | SYSTEM AND METHOD FOR COMPENSATING FOR NONLINEAR INTERFERENCE CANCELLATION IN MULTI-CARRIER TRANSMISSION - An aspect of the present invention is drawn to a receiver operable to receive a first signal transmitted on a first carrier and to receive a second signal transmitted on a second carrier. The receiver includes a first filter, a second filter and a nonlinear compensator. The first filter is arranged to receive the first signal and to generate a first filtered signal. The second filter is arranged to receive the second signal and to generate a second filtered signal. The nonlinear compensator is arranged to output a first compensating signal based on the first filtered signal and the second filtered signal and to output a second compensating signal based on the first filtered signal and the second filtered signal. Further, the nonlinear compensator can reduce one of nonlinear interference within the first filtered signal and nonlinear interference between the first filtered signal and the second filtered signal. | 07-22-2010 |
20110103507 | SYSTEM AND METHOD FOR COMBINED PREDISTORTION AND INTERFERENCE CANCELLATION IN A SATELLITE COMMUNICATIONS SYSTEM - The present invention provides a communication system for use with a first source signal and a second source signal. The first source signal is on a first channel and includes M symbols, where M is an integer greater than 1. The second source signal is on a second channel and includes X symbols, where X is an integer greater than 1. The first channel is different from the second channel. The communication system includes a first modulator unit, a second modulator unit and an adder. The first modulator unit can generate a first modulated signal based on the first source signal and includes a first inter-symbol distortion estimating unit and a first stage predistortion unit. The second modulator unit can generate a second modulated signal based on the second source signal and includes a second inter-symbol distortion estimating unit and a predistortion unit. The adder can generate an added signal based on the first modulated signal and the second modulated signal. The first inter-symbol distortion estimating unit can generate a distorted symbol vector based on an estimate of a distortion of the first through (a−1)-th symbols and an estimate of a distortion of the (a+1)-th through M-th symbols, where 1≦a≦M. The first stage predistortion unit is operable to generate a predistorted symbol ã based on the symbol a of the first plurality of symbols and the distorted symbol vector. Further, a receiver unit can cancel interference in the received signals to account for adjacent channel interference. | 05-05-2011 |
20130272367 | SYSTEM AND METHOD FOR ITERATIVE NONLINEAR COMPENSATION FOR INTERMODULATION DISTORTION IN MULTICARRIER COMMUNICATION SYSTEMS - A receiver is provided that can receive a first signal transmitted on a first carrier and a second signal transmitted on a second carrier. The receiver includes a channel estimation portion, a multicarrier nonlinear equalizer, a first log likelihood computing portion and a second log likelihood computing portion. The channel estimation portion can output a first estimation. The multicarrier nonlinear equalizer can output a first equalized signal and a second equalized signal. The first log likelihood ratio computing portion can output a first log likelihood ratio signal based on the first equalized signal. The second log likelihood ratio computing portion can output a second log likelihood ratio signal based on the second equalized signal. The multicarrier nonlinear equalizer can further output a third equalized signal and a fourth equalized signal. The third equalized signal is based on the first signal, the second signal and the first estimation. The fourth equalized signal is based on the first signal, the second signal and the first estimation. | 10-17-2013 |
20140079160 | FORWARD ERROR CORRECTION DECODER INPUT COMPUTATION IN MULTI-CARRIER COMMUNICATIONS SYSTEM - A system and methods that accommodate for nonlinear interference in a multi-carrier communications system are provided. A first signal is received by a receiver. The first signal comprises a source signal transmitted on a carrier over a communications channel. The first signal reflects a source symbol mapped to one of a plurality of signal constellation points, and each signal constellation point is associated with a different one of a plurality of signal clusters. A received representation of the source signal with respect to the source symbol is acquired from the first signal. A plurality of likelihood metrics are determined, where each likelihood metric is based on the received representation of the source signal with respect to the source symbol and a different one of a plurality of core parameters, wherein each core parameter is based on a centroid estimate with respect to a different one of the signal clusters. | 03-20-2014 |
Patent application number | Description | Published |
20080235088 | System for measuring web traffic related to an offline advertising campaign - A system is described for measuring web traffic relating to an offline advertising campaign. The system may include a processor and a memory. The memory may be operatively connected to the processor and may store an offline advertising campaign of an advertiser, a time period, a set of users and web traffic data. The processor may identify the offline advertising campaign, and the period of time the offline advertising campaign was available to a set of users. The processor may measure the web traffic related to the offline advertising campaign of the users during the time period. | 09-25-2008 |
20080235089 | SYSTEM FOR SERVING ADVERTISEMENTS BASED ON OFFLINE ADVERTISING CAMPAIGNS - A system is described for serving an online advertisement based on an offline advertising campaign. The system may include a memory, an interface and a processor. The memory may be operatively connected to the interface and the processor and may store an offline advertising campaign of an advertiser, an advertising effect period, a set of users, and an online advertisement. The interface may be operatively connected to the memory and may be used to serve the online advertisement to the users in the set of users. The processor may be operatively connected to the memory and the interface. The processor may identify the offline advertising campaign and the advertising effect period, the period when the offline advertising campaign is capable of effecting the online behavior of the set of users. The processor may identify an online advertisement relating to the offline advertising campaign. The processor may serve the online advertisement, to the users in the set of users, via the interface, during the advertising effect period. | 09-25-2008 |
20140249914 | BID OPTIMIZATION IN SEARCH ENGINE MARKETING - Methods and apparatus are described for optimally allocating an online advertising budget for a search engine marketing (SEM) campaign among a fixed set of keywords. | 09-04-2014 |