Patent application number | Description | Published |
20080291990 | Reception quality measuring apparatus and reception quality measuring method - A reception quality measuring apparatus of the present invention comprises a first sub-carrier averaging unit for averaging and outputting a channel gain after equalization estimated on the basis of the pilot signal over a sub-carrier, a first power calculation unit for calculating the power of a signal output from the first sub-carrier averaging unit and outputting the same as signal power, a pilot replica generator for generating and outputting a pilot signal replica with respect to a zero-timing signal component based on the zero-timing signal component when a signal x(n) in the time domain after equalization corresponding to the equalized signal is n=0, and also based on a previously set pilot code characteristic, a subtractor for subtracting the pilot signal replica output from the pilot replica generator from the equalized signal and outputting the result as an interference signal, a second power calculation unit for calculating and outputting the power of the interference signal output from the subtractor, a second sub-carrier averaging unit for averaging the power output from the second power calculation unit over the sub-carrier and outputting the result as interference power, and a divider for dividing the signal power output from the first power calculation unit by the interference power output from the second sub-carrier averaging unit to calculate a reception quality after equalization. | 11-27-2008 |
20090010369 | USER SELECTION METHOD AND USER SELECTION DEVICE FOR MULTIUSER MIMO COMMUNICATION - The present invention aims to provide a user selection method which can provide a large, multiuser diversity effect with a small amount of calculation in multiuser MIMO systems, the method being a user selection method for multiuser MIMO communication, in which an orthogonal coefficient is calculated using a received SINR from a projection channel vector by using GS orthogonalization, and using the orthogonal coefficient, a correction SINR is calculated, and using this correction SINR, user selection is performed, and for a next user selection, the projection channel vector is updated, and the above processes are applied to all users. | 01-08-2009 |
20090022217 | EQUALIZER AND EQUALIZATION METHOD - A correction coefficient calculating section | 01-22-2009 |
20090022253 | INPUT CIRCUIT AND SEMICONDUCTOR INTEGRATED CIRCUIT COMPRISING THE INPUT CIRCUIT - Provided are a channel estimation device and an equalization device capable of achieving high channel estimation accuracy with less amount of calculation processing. The equalization device includes: a channel estimation section including a ZF calculation/clipping processing section and correlation processing section; a weight calculation section; and an equalization filter. The ZF calculation/clipping processing section uses a signal obtained by converting a pilot code into a frequency domain to calculate a pilot reference signal according to a Zero Forcing (ZF) method and clips the gain of the calculated pilot reference signal to a predetermined value to generate a clipped pilot reference signal. The correlation processing section performs correlation between a pilot reception signal in the frequency domain and clipped pilot reference signal to estimate channel characteristics of the frequency domain. The weight calculation section calculates an equalization weight based on the channel characteristics of the frequency domain. The equalization filter performs equalization processing of a frequency domain reception signal using the equalization weight. | 01-22-2009 |
20090154419 | SCHEDULING METHOD FOR MULTI-USER MIMO - A priority computation process computes a priority of each user for each RB (Resource Brock) using a reception SINR. A maximum priority user selection/RB allocation process selects a user with the maximum priority for an unallocated RB and allocates the RB to the user. A frequency axis/space axis unallocated RB presence determination process proceeds to scheduling for a next user if there is an unallocated RB on the frequency or space axis. A projected channel vector update process updates a projected channel vector of an unselected user by GS orthogonalization. An orthogonal coefficient computation process computes an orthogonal coefficient. A corrected SINR computation process computes a corrected SINR. A next MIMO layer priority computation process computes priorities of unselected users for a corresponding RB in the next multiple MIMO layer. The priorities of the unselected users are used in the next user scheduling processing. | 06-18-2009 |
20090262853 | MIMO RECEIVING APPARATUS AND RECEIVING METHOD - In a MIMO receiving apparatus, signals of single carriers transmitted from a plurality of transmission antennas are received by a plurality of reception antennas ( | 10-22-2009 |
20100046661 | RECEIVING APPARATUS AND MOBILE COMMUNICATION SYSTEM - A receiving apparatus is provided in which a single carrier signal is received by a plurality of receiving antennas, and multipath equalization and other cell interference suppression are carried out in a frequency domain at a same time. A plurality of antennas | 02-25-2010 |
20110007792 | APPARATUS FOR CHANNEL ESTIMATION, APPARATUS FOR EQUALIZATION AND METHOD FOR EQUALIZATION - The present invention provides a channel estimation apparatus in which channel estimation may be made higher than heretofore in accuracy and may be used for calculating the weight for an equalization filter to achieve an optimum equalizing performance. A subcarrier copying unit | 01-13-2011 |
20110007852 | RECEIVING APPARATUS AND METHOD - Disclosed is a MIMO receiving apparatus in which a residual interference calculation unit ( | 01-13-2011 |
20110044383 | MIMO RECEIVING APPARATUS AND METHOD - A coherent bandwidth calculation unit ( | 02-24-2011 |
20120093272 | RECEIVING DEVICE, RECEIVING METHOD, AND PROGRAM - A receiving device includes a channel estimating section that performs a correlating process for a received reference signal in which a single carrier signal was transformed into a frequency domain signal and a pre-stored reference signal so as to obtain estimated channel values; a compensation coefficient computing section that computes compensation coefficients corresponding to residual multipath interferences based on a bit likelihood; a weight computing section that computes equalized weights based on the estimated channel values and the compensation coefficients; an equalizing filter that generates an equalized signal by equalizing process for the received signal that is the frequency domain signal based on the equalized weights; a residual interference replica generating section that generates residual multipath interference replicas based on frequency domain symbol replicas, the estimated channel values, and the equalized weights; and a subtracting section that subtracts the residual multipath interference replicas from the equalized signal. | 04-19-2012 |