Patent application number | Description | Published |
20100278035 | METHOD AND SYSTEM FOR MULTI-USER DETECTION USING TWO-STAGE PROCESSING - Systems and methods for multi-user detection in a multiple access system are provided. In one aspect, an apparatus is provided. The apparatus comprises a processing unit configured to process received chips into received symbols for a plurality of users and a computation unit configured to compute a multi-user matrix using a Hadamard matrix, wherein the multi-user matrix relates user symbols for the plurality of users to the received symbols. The apparatus further comprises a detection unit configured to detect the user symbols for the plurality of users using the received symbols and the computed multi-user matrix. | 11-04-2010 |
20100278216 | METHOD AND SYSTEM FOR INTER-CELL INTERFERENCE CANCELLATION - Systems and methods for inter-cell interference cancellation are provided. In one aspect of the disclosure, an apparatus is provided. The apparatus comprises a cell computation unit configured to compute receive chips for a first interfering cell and a subtraction unit configured to remove the computed receive chips for the first interfering cell from received chips at a receiver. The apparatus further comprises a processing unit configured to process the received chips with the computed receive chips for the first interfering cell removed into received symbols and a detection unit configured to detect user symbols for a target cell from the received symbols. | 11-04-2010 |
20100278219 | METHOD AND SYSTEM FOR MULTI-USER DETECTION IN THE PRESENCE OF MULTIPLE SPREADING FACTORS - Methods and systems for multi-user detection in the presence of multiple spreading factors are provided. In one aspect of the disclosure, an apparatus is provided. The apparatus comprises an interference computation unit configured to compute a combined interference based on detected user symbols for a first spreading factor and detected user symbols for a second spreading factor, wherein the combined interference accounts for multi-user interference from user symbols for the first and second spreading factors. The apparatus further comprises an interference cancellation unit configured to remove the computed combined interference from a plurality of received symbols corresponding to the first spreading factor and a redetection unit configured to redetect the user symbols for the first spreading factor from the plurality of received symbols with the computed combined interference removed. | 11-04-2010 |
20100278284 | METHOD AND SYSTEM FOR SYMBOL DETECTION USING SUB-CONSTELLATIONS - Systems and methods for symbol detection using sub-constellations are provided. In one aspect of the disclosure, an apparatus is provided. The apparatus comprises a processing unit configured to process received chips into received symbols for a plurality of users, a first detection unit configured to detect first components of user symbols for the plurality of users based on the received symbols and a computation unit configured to compute a portion of the received symbols due to the first components of the user symbols. The apparatus further comprises a second detection unit configured to detect second components of the user symbols based on the received symbols with the computed portion removed and a combining unit configured to detect the user symbols by combining the first components of the user symbols with the respective second components of the user symbols. | 11-04-2010 |
20100309956 | METHOD AND SYSTEM FOR INTERFERENCE CANCELLATION - Systems and methods for interference cancellation at a receiver in a wireless communication system are provided. In one aspect, a method for interference cancellation is provided. The method comprises providing total received chips received from a plurality of cells. The method also comprises successively estimating received chips for each of the plurality of cells in a plurality of iterations, wherein each of the plurality of iterations after a first iteration comprises canceling previously estimated received chips for one or more of the plurality of cells from the total received chips, and estimating received chips for one of the plurality of cells using the total received chips with the previously estimated received chips for the one or more of the plurality of cells cancelled out. | 12-09-2010 |
20110319045 | LINEAR INTERFERENCE CANCELLATION RECEIVER - Interference cancellation at a user equipment includes performing channel estimation for each component of an aggregate received signal using at least one received midamble of at least one time slot. The aggregate received signal is received from at least one Node B. A combined channel is computed for each channelization code based on the channel estimation. A linear transfer function is obtained for all user equipment within a cell. This linear transfer function includes a combined channel for each channelization code. An equalization matrix is derived from the linear transfer function and then applied to the aggregate received signal to obtain the component intended for the user equipment. | 12-29-2011 |
20120069753 | CHANNEL ESTIMATION BASED ON MIDAMBLE - Channel estimation at a user equipment includes estimating channel quality of at least one channel. A first algorithm or a second algorithm is selected based on the estimated channel quality. Channel estimation is performed based on the selected algorithm. The first algorithm may be a midamble multiplication-based algorithm. The second algorithm may be a midamble division algorithm. Channel estimation may also include estimating noise of a channel and adaptively setting a threshold based on the estimated noise to refine the channel estimation. The estimating channel quality, selecting of a first or second algorithm and channel estimation may be performed iteratively for contributing signals on a channel. An adaptive threshold may be modified across iterations. The channel estimation may also include determining a delay profile of a channel to refine the channel estimation. | 03-22-2012 |
20120093269 | APPARATUS AND METHOD FOR TWO-STAGE LINEAR/NONLINEAR INTERFERENCE CANCELLATION - An apparatus and method for a two-stage linear/nonlinear interference cancellation comprising processing a receive signal to produce a first descrambled signal; and processing the first descrambled signal to produce a detected signal. In one aspect, a first interference canceller module is used for processing the received signal and a second interference canceller module is used for processing the first descrambled signal. In one aspect, the first interference canceller is a linear interference canceller (IC) and the second interference canceller is a linear/nonlinear interference canceller (IC). | 04-19-2012 |
20140213210 | Method of Robust Receive (Rx) Processing for Radio Frequency Coexistence Management in Dual-SIM-Dual-Active Communication Devices - The various embodiments include a dual-SIM-dual-active (DSDA) device and methods for implementing robust receive (Rx) processing to resolve radio frequency coexistence interference between two subscriptions operating on the DSDA device. The DSDA device may detect when a subscription (the “aggressor”) de-senses the other subscription (the “victim”) as a result of the aggressor's transmissions, and in response, implement robust Rx processing to mitigate the effects of de-sense on the victim while causing minimal impact to the aggressor. | 07-31-2014 |
20140213235 | Method of Robust Transmit (Tx) Processing for Radio Frequency Coexistence Management in Dual-SIM-Dual-Active communication Devices - The various embodiments include a dual-SIM-dual-active (DSDA) device and methods for implementing robust transmit (Tx) processing to resolve radio frequency coexistence interference between two subscriptions operating on the DSDA device. The DSDA device may detect when one subscription (the “aggressor”) de-senses the other subscription (the “victim”) as a result of the aggressor's transmissions, and in response, implement robust Tx processing to mitigate the effects of de-sense on the victim. | 07-31-2014 |