Patent application number | Description | Published |
20110064008 | SINGLE-USER BEAMFORMING METHOD AND APPARATUS SUITABLE FOR FREQUENCY DIVISION DUPLEX SYSTEM - The present invention provides a single-user beamforming method suitable for a frequency division duplex system, comprising the following steps: obtaining a first transmission weight and a second transmission weight according to an uplink signal; using the first transmission weight to weight after adding a dedicated pilot of a layer | 03-17-2011 |
20110103254 | Method and device for multi-user beamforming based on a frequency division duplex system - The present invention discloses an FDD (Frequency Division Duplex) system based multi-user beamforming method and device. The method comprises the steps of: when two or more user terminals are at respective AOAs (Angles of Arrival), determining a transmit weight of a downlink signal of each user terminal by using a null-widening algorithm, and storing the transmit weight in a network side; and, the network side grouping the user terminals based on AOA information reported by the user terminals, selecting a corresponding transmit weight for the downlink signal of each user terminal in each group based on the AOA information of the user terminals in the group, and transmitting the selected transmit weight after multiplying it by a downlink data stream of the user terminal corresponding to the transmit weight. The present invention can reduce the computation burden of the network side, enhance the efficiency of beamforming, and thus increase the capacity of the FDD system while ensuring the communication quality. | 05-05-2011 |
20120207050 | Method and device for multi-user beamforming based on a frequency division duplex system - The present invention discloses an FDD (Frequency Division Duplex) system based multi-user beamforming method and device. In the method, when two or more user terminals are at respective AOAs (Angles of Arrival), a transmit weight of a downlink signal of each user terminal is determined by using a null-widening algorithm, and the transmit weight is stored in a network side, the network side groups the user terminals based on AOA information reported by the user terminals, a corresponding transmit weight for the downlink signal of each user terminal in each group is selected based on the AOA information of the user terminals in the group, and the selected transmit weight is transmitted after multiplying it by a downlink data stream of the user terminal corresponding to the transmit weight. | 08-16-2012 |
20120282863 | ANTENNA TESTING SYSTEM AND ANTENNA TESTING METHOD - This disclosure claims antenna testing system, including a signal transmission simulator, a channel emulator and an anechoic chamber; more than two antennae are set in the anechoic chamber; each antenna is connected with the signal transmission simulator through the channel emulator; the more than two antennae are located on the sphere which center is the position of the device under test. This disclosure claims an antenna testing method, comprising: more than one channel model for test is set in the signal transmission simulator; a channel model is selected from the more than one channel model; wireless signals are transmitted according to the selected channel model; after emulation processed by channel emulator, emulated wireless signals are transmitted through the antennae in anechoic chamber; DUT set in the anechoic chamber receives and then processes the signals transmitted from each antenna, and outputs the processing results. | 11-08-2012 |
20130027256 | METHOD AND SYSTEM FOR TESTING OVER-THE-AIR (OTA) PERFORMANCE IN MULTI-ANTENNA SYSTEM - The present invention discloses a method and system for testing OTA performance in a multi-antenna system. Multiple antennas are set in an anechoic chamber; a BS simulator is controlled to transmit benchmark test signal to DUT through a channel emulator and antennas; when determining the benchmark test signal does not meet set requirement, the benchmark test signal is adjusted until set requirement is met; corresponding test cases are determined according to different channel models; according to channel models, the channel emulator performs channel simulation processing on test signal output from the BS simulator and sends the test signal to DUT through antennas; after DUT receives the test signal, each OTA performance is tested according to OTA performance test items corresponding to test cases; and DUT is judged to reach the standard when all OTA performances reach the standard. The present invention is easy to implement and has a low cost. | 01-31-2013 |
20130308727 | MULTI-LAYER BEAM FORMING METHOD AND USER EQUIPMENT (UE) FOR IMPLEMENTING MULTI-LAYER BEAM FORMING - The disclosure provides a multi-layer beam forming method. The method includes: according to an obtained transmitting weight value of each space channel layer, obtaining a signal-to-noise ratio of a data stream, arriving at a receiving side, of each layer; according the obtained signal-to-noise ratio of the data stream, arriving at the receiving side, of each layer, determining a data stream which is able to be transmitted; performing beam forming for the data stream which is able to be transmitted and transmitting the data stream subjected to the beam forming to the receiving side. The disclosure further provides User Equipment (UE) for implementing multi-layer beam forming. Only a data stream, which can be decoded by a receiving side, of each layer is transmitted, thereby utilizing channel capacity to the most extent while adequately and reasonably utilizing space channel resources. | 11-21-2013 |
20140185486 | Method and device for channel estimation - The disclosure provides a method for channel estimation, including that: a small-scale fading channel of each carrier of each interfering channel is obtained respectively according to a Gaussian distribution; a total interfering power P | 07-03-2014 |
20140376664 | Method and device for retransmitting data under antenna gain imbalance - The disclosure provides a method and device for retransmitting data under antenna gain imbalance, and the method includes: determining that gains of multiple antennas at a transmission terminal are imbalanced; using a better spatial sub-channel in the multiple antennas to retransmit data when streams transmitted by the multiple antennas adopt a same Modulation and Coding Scheme; and using a better spatial sub-channel in the multiple antennas to retransmit data and/or using a single-stream approach to retransmit data when the streams transmitted by the multiple antennas adopt different Modulation and Coding Schemes. The disclosure selects a corresponding retransmission approach according to the condition of a spatial sub-channel on which streams have an error, thus improving and ensuring success rate for retransmitting a stream. | 12-25-2014 |