Patent application number | Description | Published |
20130083768 | UPLINK BASEBAND SIGNAL COMPRESSION METHOD, DECOMPRESSION METHOD, DEVICE AND SYSTEM - Embodiments of the present invention disclose an RRU, which performs IDFT on a PUSCH signal that is obtained after resource block demapping, where due to a characteristic of an extremely low peak to average power ratio of SC-FDMA modulation, a signal after IDFT has an extremely low peak to average power ratio at this time, and an amplitude range of the signal changes slightly; amplitude/phase conversion is performed on the signal after the IDFT, where the signal after the IDFT is represented by using amplitude and phase, and then amplitude quantization and phase quantization are performed respectively to obtain a quantized amplitude signal and a quantized phase signal respectively. | 04-04-2013 |
20130102305 | WIRELESS ACCESS METHOD, DEVICE, AND SYSTEM - Embodiments of the present invention disclose a wireless access method, device, and system. The method includes: sending pilot signal strength or channel characteristics to a central processing node, where the pilot signal strength or channel characteristics are fed back by a user terminal within the coverage area of a wireless access node and are between the wireless access node and the corresponding user terminal; receiving access indication information of the user terminal, which is fed back by the central processing node and is determined according to the pilot signal strength or channel characteristics, where the access indication information of the user terminal includes an identifier of the wireless access node connected with the user terminal and a corresponding coding and modulation scheme; and sending the identifier of the wireless access node connected with the user terminal and the corresponding coding and modulation scheme to the corresponding user terminal. | 04-25-2013 |
20130148756 | DATA TRANSMISSION METHOD, TRANSMITTER AND RECEIVER IN COORDINATED COMMUNICATION SYSTEM - The present invention provides a data transmission method, a transmitter, and a receiver in a coordinated communication system, including: precoding, by a first transmitter, its payload data by using a first precoding matrix to obtain first precoded data; precoding, by the first transmitter, coordinated data by using a second precoding matrix to obtain second precoded data to cancel interference with the first precoded data at a receiver caused by data transmitted by another transmitter; and transmitting the first precoded data and the second precoded data after the precoding to the receiver. According to the method, the first transmitter codes its payload data by using the first precoding matrix; and codes the coordinated data by using the second precoding matrix to cancel, by using different precoding matrices, the interference with the first precoded data at the receiver caused by the data transmitted by another transmitter. | 06-13-2013 |
20130177048 | Receiving Method, Apparatus, and System in Cooperative Communications - A method includes: demodulating a signal transmitted by a first source end that is received to obtain a first log-likelihood ratio; demodulating a signal transmitted by a second source end that is received to obtain a second log-likelihood ratio; demodulating a signal transmitted by a relay node that is received to obtain a third log-likelihood ratio; based on an exclusive OR feature of network coding, processing the first log-likelihood ratio, the second log-likelihood ratio, and the third log-likelihood ratio to obtain a posterior log-likelihood ratio of the first source end; and decoding the signal transmitted by the first source end that is received by using the posterior log-likelihood ratio of the first source end. | 07-11-2013 |
20140029952 | DATA TRANSMISSION METHOD AND RELATED DEVICE AND SYSTEM - Embodiments of the present invention disclose a data transmission method and a related device and system. A data transmission method includes: A transmitter performs scrambling, constellation modulation, and multiple-input multiple-output precoding processing sequentially on downlink user data to obtain a precoded symbol sequence; performs time-frequency resource mapping on the precoded symbol sequence to obtain frequency domain data of an OFDM symbol; performs conjugate symmetric extension and IFFT on the frequency domain data of the OFDM symbol to obtain a time domain real-number sequence; performs CP insertion processing on the time domain real-number sequence to form a first downlink time domain baseband signal; loads the first downlink time domain baseband signal onto a direct current of a LED lighting circuit to form a LED driving electrical signal; and converts the LED driving electrical signal into a visible beam of the LED for transmission. | 01-30-2014 |
20150016343 | METHOD AND SYSTEM FOR TRANSMITTING DATA STREAM - Disclosed are a method and a system for transmitting a data stream, aiming at increasing system capacity. The method includes: transmitting, by a first sending end, a coded first data stream to a first receiving end, and transmitting, by a second sending end, a coded second data stream to a second receiving end on time-frequency resources occupied by transmission of the first data stream by the first sending end; decoding, by the first receiving end, a first received signal received to obtain a first decoded result, and transmitting at least one decoded result in the first decoded result to the second receiving end; and decoding, by the second receiving end, a second received signal received, by using the at least one decoded result in the first decoded result to obtain a second decoded result. | 01-15-2015 |
20150049736 | MIMO WIRELESS COMMUNICATION SYSTEM, MIMO TRANSMISSION METHOD, AND APPARATUS - Embodiments of the present invention provide a MIMO wireless communication system, a MIMO transmission method, and an apparatus, which relate to the field of communications technologies and are invented to effectively improve transmission efficiency and decrease a transmission delay. The MIMO wireless communication system includes: a base station, a first user equipment, and at least one second user equipment, where the first user equipment performs cellular uplink communication with the base station, and performs device-to-device communication with the at least one second user equipment, and the same time-frequency resource is used in the cellular uplink communication between the first user equipment and the base station and the device-to-device communication between the first user equipment and the second user equipment. The present invention is applicable to wireless communication technologies. | 02-19-2015 |
20150222342 | SIGNAL TRANSMISSION METHOD, SYSTEM, AND DEVICE - The present invention provides a signal transmission method, system, and device, where the method includes: setting K virtual users, where each virtual user is associated with one base station; obtaining base station precode and user precode corresponding to each of the K virtual users; splitting a baseband signal to the K virtual users, and obtaining a split baseband signal corresponding to each of the K virtual users; processing, according to the base station precode and the user precode corresponding to each virtual user, the split baseband signal corresponding to each virtual user, and obtaining an uplink signal corresponding to each virtual user; and obtaining timing advances {t | 08-06-2015 |