| Patent application number | Description | Published |
|---|
| 20090013236 | Method And Apparatus For Cascade Encoding - A cascade encoding method and apparatus are applied to a handheld television system or other fields. The method includes the following: A. Reed-Solomon (RS) encoding is performed on inputted Medium Access Control (MAC) packets, and coded MAC packets are outputted; and B. Low density parity check code (LDPC) encoding is performed on the coded MAC packets, and LDPC encoding blocks are outputted. The apparatus includes an RS coder and an LDPC coder. The RS encoding and LDPC encoding are cascaded to encode an inputted code flow, so as to reduce an error rate. Meanwhile, bytes in one RS encoding data block are dispersed into different LDPC blocks to be encoded through byte interleaving, thereby sufficiently utilizing error code characteristics of the RS encoding and the LDPC encoding for decoding, and improving error correction capability of a system. | 01-08-2009 |
| 20090201980 | METHOD AND DEVICE FOR ESTIMATING A GAUSSIAN WHITE NOISE POWER IN A CHANNEL, AND RECEIVER - A method and device for estimating a Gaussian white noise power in a channel and a receiver are provided. The method includes performing a multi-path search on a received signal to find out paths of the signal; performing a noise estimation on one of the paths to acquire a total noise power of the path; performing an inter-path interference noise estimation on N paths spaced apart from the path by an integral number of chips to obtain an inter-path interference noise power of a single path of the signal, where N is an integer greater than or equal to 1; and subtracting the inter-path interference noise power from the total noise power to obtain the Gaussian white noise power. Through the technical solution of the disclosure, the Gaussian white noise power in a channel is obtained with a higher accuracy, so that the performance of equalization is enhanced. | 08-13-2009 |
| 20100222056 | METHOD AND APPARATUS FOR SEARCHING FOR MODES AND FREQUENCIES - The present invention discloses a method and an apparatus for searching for modes and frequencies. The method includes: obtaining signal energy of all frequency grids within a frequency range; obtaining energy of each mode on a smallest bandwidth according to the signal energy of the grids; sorting the energy on the smallest bandwidths of all modes; and accessing a specified number of frequencies and modes of the highest energy in the sorting result. With the present invention, energy on the smallest bandwidths of all modes at a frequency band is obtained and sorted and then an access mode is determined according to the sorting result. Thus the access mode to use for a specified frequency can be quickly determined so as to improve the access success rate of a terminal in the subsequent access process. | 09-02-2010 |
| 20100226464 | METHOD AND APPARATUS FOR ELIMINATING FREQUENCY-DOMAIN INTERFERENCE SIGNALS - The present invention discloses a method and an apparatus for eliminating frequency-domain interference signals, and relates to communication technologies. The method includes: multiplying a frequency-domain channel estimation value by a frequency-domain interference signal to obtain a frequency-domain received interference signal; and subtracting the frequency-domain received interference signal from the frequency-domain received signal to obtain the frequency-domain received signal free of interference. The apparatus includes a multiplying module and a subtracting module. A frequency-domain equalizer includes an interference signal obtaining module and an interference signal eliminating module. The technical solution provided herein eliminates interference signals in the frequency domain, and saves the calculation load in contrast with elimination of time-domain interference signals. | 09-09-2010 |
| 20100227560 | METHOD AND APPARATUS FOR ESTIMATING TIME OF ARRIVAL - Method and apparatus are provided for estimating Time of Arrival (“TOA”). The method includes: performing channel estimation according to a Normal Burst (“NB”) free of interference and a local training sequence and generating a channel estimate, performing TOA estimation according to the channel estimate, and adjusting a synchronization position of the current NB according to a TOA estimation result. Interference to signals is cancelled before the TOA estimation, thus overcoming energy estimate deviation arising from interference in a strongly interfering radio environment, as occurs in the prior art, and preventing the impact on the TOA estimation. The disclosed methods and apparatus provide for more accurate energy estimates in a strongly interfering radio environment. The technical solution under the present invention does not require adjustment of the method of adjusting the search window. | 09-09-2010 |
| 20110130089 | System and Method for Performing Weighted Processing on Uplink Signal - An uplink signal weighted processing method is disclosed. A first channel impulse response from a Mobile Station (MS) to a relay station, and a second channel impulse response from the relay station to a Base Station (BS) are acquired. A relay weight and a demodulation weight are determined according to the first channel impulse response and the second channel impulse response. The relay weight is sent to the relay station and the demodulation weight is sent to the BS, so as to enable the relay station to perform weighted processing on an MS uplink signal received by the relay station according to the relay weight to obtain an uplink relay weighted signal and to send the uplink relay weighted signal to the BS, and so as to enable the BS to perform demodulation weighted processing on the uplink relay weighted signal received by the BS according to the demodulation weight to obtain an uplink estimation signal corresponding to the MS uplink signal. | 06-02-2011 |
| 20110134970 | SYSTEM AND METHOD FOR PERFORMING WEIGHTED PROCESSING ON DOWN LINK SIGNAL - A method, device, and communications system for performing weighted processing on a downlink signal are provided. The method includes: acquiring a first CIR from a BS to a relay station and a second CIR from the relay station to a MS; determining a pre-coding weight and a relay weight according to the first CIR and the second CIR; and respectively sending the pre-coding weight and the relay weight to the BS and the relay station, so that the BS is enabled to perform weighted processing on a downlink signal according to the pre-coding weight to obtain a downlink pre-coding weighted signal and send the downlink pre-coding weighted signal to the relay station, and the relay station is enabled to perform weighted processing on the downlink pre-coding weighted signal received by the relay station according to the relay weight to obtain a downlink relay weighted signal and send the downlink relay weighted signal to the MS. Thereby, the downlink signal is optimized at the BS and the relay station respectively, thus optimizing the network capacity and improving the communication quality. | 06-09-2011 |
| 20110142117 | SIGNAL DETECTING METHOD AND DEVICE FOR MULTI-CODEWORD MIMO SYSTEM - A signal detecting method and device for a multi-codeword multi-input multi-output (MIMO) system are provided, which are used in the field of communication and solve the problem that it is complex to implement a signal detecting method in the multi-codeword MIMO system and the error between the signal obtained through detection and the signal actually transmitted from the transmitting end is large. The method includes: converting a received complex number signal into a real number signal; performing channel estimation to obtain a channel matrix; correcting the channel matrix to obtain an equivalent corrected matrix; generating an equivalent detecting signal according to the equivalent corrected matrix and the real number signal obtained through conversion; quantizing the equivalent detecting signal to obtain an equivalent quantized detecting signal; and generating a signal transmitted from a transmitting end according to the equivalent quantized detecting signal. The method and device can be applied in a receiving device of a multi-codeword MIMO system. | 06-16-2011 |
