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Method and apparatus for mitigating multiuser access interferenceRelated Patent Categories: Telecommunications, Transmitter And Receiver At Separate Stations, Distortion, Noise, Or Other Interference Prevention, Reduction, Or CompensationMethod and apparatus for mitigating multiuser access interference description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070072550, Method and apparatus for mitigating multiuser access interference. Brief Patent Description - Full Patent Description - Patent Application Claims
[0001] This application claims the benefit of U.S. Provisional Application No. 60/722,018, filed on Sep. 28, 2005, which is hereby incorporated by reference. BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to a method for mitigating interference, and more particularly, to a method and an apparatus for mitigating multiuser access interference. [0004] 2. Discussion of the Related Art [0005] In the world of cellular telecommunications, those skilled in the art often use the terms 1G, 2G, and 3G. The terms refer to the generation of the cellular technology used. 1G refers to the first generation, 2G to the second generation, and 3G to the third generation. [0006] 1G refers to the analog phone system, known as an AMPS (Advanced Mobile Phone Service) phone systems. 2G is commonly used to refer to the digital cellular systems that are prevalent throughout the world, and include CDMAOne, Global System for Mobile communications (GSM), and Time Division Multiple Access (TDMA). 2G systems can support a greater number of users in a dense area than can 1G systems. [0007] 3G commonly refers to the digital cellular systems currently being deployed. These 3G communication systems are conceptually similar to each other with some significant differences. [0008] With respect to detecting signals transmitted by single to multi-users, typically, signals that originate from closer distance have stronger signal than the signals transmitted from a far distance. Moreover, stronger signals are less susceptive to problems associated with interference. [0009] To combat problems associated with the signals far from to the source as opposed to near from the source, several existing approaches or views exist, such as interference estimation and cancellation and subspace-based approach. For example, the interference estimation and cancellation approach reconstructs signal interference based on channel estimation (e.g., timing, amplitude, and phase), and thereafter, eliminates the interference before performing detection. As another example, the subspace-based approach estimates interfering signal subspace and constructs multi-user detectors before performing detection. [0010] Although these approaches work, it can be a bit complex, involves complicated matrix subspace decomposition, and need to assume that there are unlimited or enough received signals. SUMMARY OF THE INVENTION [0011] Accordingly, the present invention is directed to a method and an apparatus for mitigating multiuser access interference that substantially obviates one or more problems due to limitations and disadvantages of the related art. [0012] An object of the present invention is to provide a method of mitigating interference in a multiple access interference wireless communication system. [0013] Another object of the present invention is to provide an apparatus for mitigating interference in a multiple access interference wireless communication system. [0014] Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings. [0015] To achieve these objects and other advantages and in accordance with the purpose of the invention, as embodied and broadly described herein, a method of mitigating interference in a multiple access interference wireless communication system includes receiving at least one signal from at least one transmitting end, constructing a group of first signal signatures based on a predetermined number of received signals and at least one second signal signature, estimating a set of values using the constructed group of first signal signatures, and detecting desired information using the detected set of values. [0016] In another aspect of the present invention, an apparatus for mitigating interference in a multiple access interference wireless communication system includes a receiving unit for receiving at least one signal from at least one transmitting end, a constructing unit for a group of first signal signatures based on a predetermined number of received signals and at least one second signal signature, an estimating unit estimating a set of values using the constructed group of first signal signatures, a combining unit for combining the at least one estimated variable component with the constructed data matrix, and a detecting unit for detecting desired information using the detected set of values. [0017] In a further aspect of the present invention, an apparatus for mitigating interference in a multiple access interference wireless communication system includes receiving signals from at least one transmitting end, constructing a blind spreading sequence matrix in which each interference is treated as known signal and data matrix, estimating at least one variable component by using the at least one received signals and by using the constructed blind spreading sequence matrix, multiplexing the at least one estimated variable component with the constructed data matrix, and detecting data using the at least one combined variable component. [0018] It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS [0019] The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings; [0020] FIG. 1 illustrates wireless communication network architecture; [0021] FIG. 2A illustrates a CDMA spreading and de-spreading process; Continue reading about Method and apparatus for mitigating multiuser access interference... Full patent description for Method and apparatus for mitigating multiuser access interference Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Method and apparatus for mitigating multiuser access interference patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. 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