Patent application number | Description | Published |
20090059781 | METHOD AND APPARATUS FOR ICI CANCELLATION IN COMMUNICATION SYSTEMS - An apparatus capable of inter-carrier interference (ICI) cancellation in a communication system, the apparatus comprising a detecting module configured to detect an ISI-free region free from inter-symbol interference (ISI) in a guard interval (GI) of a symbol in time domain, a windowing module configured to provide a windowing function in time domain, identifying a weight value in the windowing function based on the ISI-free region, and multiplying a channel response related to the symbol by the windowing function in time domain to obtain a windowing result, wherein the windowing result comprises a first portion corresponding to the ISI-free region and a second region corresponding to an end portion of the symbol, the end portion and the ISI-free region having the same length, and a combination module configured to combine the first portion and the second portion of the windowing result in time domain. | 03-05-2009 |
20090135977 | DEVICE FOR AND METHOD OF SIGNAL SYNCHRONIZATION IN A COMMUNICATION SYSTEM - A device for signal synchronization in a communication system, the device comprising a first detector configured to perform a first sliding correlation for a received signal and a pseudo-random noise (PN) sequence to obtain information on symbol timing, a second detector configured to identify a fractional carrier frequency offset (FCFO) using the information on symbol timing and the cyclic extension property of the PN guard interval (GI), a first multiplier configured to provide a first product by multiplying the received signal with the FCFO, and a third detector comprising a set of second multipliers configured to provide a set of second products by multiplying the first product with each of a set of phases related to integral carrier frequency offsets (ICFOs), a set of sliding correlators each being configured to perform a second sliding correlation for the PN sequence and one of the set of the second products, the set of sliding correlators providing a set of peak values, and a peak detector configured to identify an ICFO by detecting an index number of a maximal value among the set of peak values. | 05-28-2009 |
20090257515 | TRANSMISSION METHOD OF WIRELESS SIGNAL AND TRANSMITTER USING THE SAME - A transmission method of a wireless signal including the following steps is provided. Multiple orthogonal frequency division multiplexing (OFDM) symbols carried by multiple subcarriers are generated according to a data signal. A scrambling pattern including multiple scrambling symbols is generated, wherein the scrambling symbols respectively correspond to the subcarriers in the frequency domain. The scrambling symbols corresponding to two contiguous subcarriers are correlated. The scrambling symbols are utilized to encode the OFDM symbols carried by the corresponding subcarriers. | 10-15-2009 |
20110150153 | Apparatus and Method for Inter-Carrier Interference Cancellation - A method for inter-carrier interference cancellation is provided. A time-domain received signal is detected to obtain information of an inter-symbol interference free region. Multiple cyclic useful symbols are obtained from the time-domain received signal according to the information of the inter-symbol interference free region and a set of multi-step windowing coefficients is generated. Adjusted cyclic useful symbols are obtained by multiplying the cyclic useful symbols by the set of multi-step windowing coefficients, respectively, and then combined in a time domain to obtain a time-domain combination signal. The inter-carrier interference of each of sub-carriers of the time-domain combination signal is centralized on neighboring D sub-carriers. The time-domain combination signal is transformed into a frequency-domain received signal. The frequency-domain received signal and its corresponding channel response matrix are divided into overlapped signal blocks according to D. Successive inter-carrier interference cancellation is performed on each signal block in parallel to obtain estimation data. | 06-23-2011 |
20120121002 | Receiver and Signal Receiving Method Thereof - A signal receiving method of a receiver includes following steps. Multiple time-domain received signals are transformed into multiple frequency-domain received signals, and channel response matrices corresponding to the frequency-domain received signals are estimated. The frequency-domain received signals are STBC decoded and multiple original combination signals are obtained based on the corresponding channel response matrices. The frequency-domain received signals are rearranged, and the rearranged frequency-domain received signals are STBC decoded and multiple rearrangement combination signals are obtained based on the corresponding channel response matrices. The original combination signals and the rearrangement combination signals are randomly chosen and summed to obtain multiple complex signals. The complex signal with minimum interference power is selected and then the selected signal is used to cancel interference and compensate the channel effect to obtain the detected data. | 05-17-2012 |
20130170539 | COMMUNICATION DEVICE CAPABLE OF CHANNEL ESTIMATION AND METHOD THEREOF - Communication methods and communication devices are disclosed. The communication method, performed by a communication device, including: receiving a time-domain OFDM symbol; converting the time-domain OFDM symbol to a frequency-domain OFDM symbol containing a plurality of pilot sub-carrier received signals; extracting the plurality of pilot sub-carrier received signals from the frequency-domain OFDM symbol; estimating a plurality of first frequency-domain channel average responses (CARs) of pilot sub-carriers according to the plurality of pilot sub-carrier received signals and a plurality of pilot sub-carrier transmitted signals; determining a pilot sub-carrier number parameter for a sub-carrier block according to a statistical information of channel delay; splitting all sub-carriers into a plurality of sub-carrier blocks according to the pilot sub-carrier number parameter; and estimating second frequency-domain CARs of all sub-carriers by performing weighting average and interpolation based on the first frequency-domain CARs of the pilot sub-carriers in all sub-carrier blocks. | 07-04-2013 |
20140003371 | TRANSMITTER AND RECEIVER AND IDENTIFICATION PATTERN TRANSMISSION METHOD AND IDENTIFICATION PATTERN DETECTION METHOD | 01-02-2014 |