摘要:
The present invention relates to technique for frame synchronization in a distributed MIMO-OFDM system, and the method thereof comprises: generating step: generating preambles for synchronization at respective transmitting antennas using PN sequences with different lengths which have one-to-one correspondence to the respective transmitting antennas by a transmitter; locating step: performing calculation using correlation calculators with width of window corresponding to the lengths of the PN sequences to locate head of frame by a receiver. The present invention proposes a solution for frame synchronization using sequences with non-equal periods in a distributed MIMO-OFDM system, and head of the frames transmitting from respective transmitting antennas can be accurately found using correlation calculation at a receiver by means of the technique. Since the PN sequences with different lengths are used at respective transmitting antennas to form corresponding preambles, when a correlation calculator corresponding to a certain transmitting antenna is used, all data or preambles at other antennas can not produce interference, i.e. delay between distributed transmitting antennas can not has an effect on detection of head of frame at a certain transmitting antenna.
摘要:
A mobile terminal is provided in the present invention, comprising: a channel state information feedback calculating unit configured to calculate a channel state information feedback between the mobile terminal and a serving cell of the mobile terminal and those between the mobile terminal and all cooperating cells; a channel quality information feedback calculating unit configured to calculate a channel quality information feedback for the serving cell of the mobile terminal; and a transmission unit configured to transmit the channel state information feedbacks and the channel quality information feedback to the serving cell. The present invention greatly improves the performance of a LTE-A system and greatly reduces feedback overhead. The present invention is a scalable feedback solution and may be flexibly applied to various coordinated multipoint transmission scenarios.
摘要:
A Macro-Diversity HandOver (MDHO) solution based on multi-User MIMO is provided. Multiple base stations (BSs) serve the MDHO zone. By jointly precoding the modulated signals to be sent, the multiple BSs send the precoded signals to the multiple mobile stations (MSs) over the same time-frequency resources. The signal to be sent is transmitted to the multiple MSs in the MDHO zone. Due to the adoption of the precoding technique, each MS makes no or small interference to other MSs. Since the multiple BSs that serve one MDHO zone serve multiple MSs over the same time-frequency resources, the system capacity in the MDHO zone is greatly improved.
摘要:
The present invention discloses a method and apparatus for constructing a codebook. The method comprises: receiving grouping information on a plurality of transmit antennas of a base station: obtaining a channel model for a channel between a mobile terminal and the base station; and determining an optimal precoding matrix corresponding to each antenna group according to the grouping information and the channel model, so as to construct a codebook used for precoding. The present invention further discloses a method and apparatus for selecting a precoding matrix, as well as a method, apparatus and system for precoding.
摘要:
A method and device for the baseband process of space-time/space-frequency/spatial diversity transmitter in the SC-FDMA system, the device is characterized in that: 1) an encoding means is connected to the output end of the M-point DFT module; 2) a space-time encoding means, for encoding the corresponding symbol of at least two adjacent symbol sets, and outputting at least two data sets; each sub-carrier mapping means maps respectively each data set to the corresponding antenna, so that the mapped data satisfy the requirements: The symbols mapped on each antenna keep the same sequence as the M symbols outputted by the M-point DFT module; the mapped symbols keep the same sub-carrier interval; the M data of each mapped SC-FDMA symbol are the M outputted data of the DFT module, or the inverse of the M outputted data, or the complex conjugate of the M outputted data, or the inverse complex conjugate of the M outputted data. The present invention implements effective space diversity, reduces PAPR, and makes frequency domain equalization feasible.
摘要:
The present invention discloses a V-BLAST detection method for a MIMO system, including: a first detecting step for acquiring in sequence the old detection components of a transmitting symbol vector with the optimum ordering-successive interference cancellation detection method; a second detecting step for taking the detection component with the highest space diversity degree among the old detection components as a first new lo detection component, and acquiring in sequence the other new detection components of the transmitting symbol vector in an inverse order of the optimum detection order with the optimum ordering-successive interference cancellation detection method; an outputting step for outputting the first new detection component and the other new is detection components as the final detection result. The method according to the invention employs the outer close loop iteration technology to further reduce inter-layer error propagation of V-BLAST. This method has less complexity.
摘要:
The present invention discloses a method and apparatus for constructing a codebook. The method comprises: receiving grouping information on a plurality of transmit antennas of a base station; obtaining a channel model for a channel between a mobile terminal and the base station; and determining an optimal precoding matrix corresponding to each antenna group according to the grouping information and the channel model, so as to construct a codebook used for precoding. The present invention further discloses a method and apparatus for selecting a precoding matrix, as well as a method, apparatus and system for precoding.
摘要:
The present invention discloses a method and apparatus for constructing a codebook. The method comprises: receiving grouping information on a plurality of transmit antennas of a base station: obtaining a channel model for a channel between a mobile terminal and the base station; and determining an optimal precoding matrix corresponding to each antenna group according to the grouping information and the channel model, so as to construct a codebook used for precoding. The present invention further discloses a method and apparatus for selecting a precoding matrix, as well as a method, apparatus and system for precoding.
摘要:
A Macro-Diversity HandOver (MDHO) solution based on multi-User MIMO is provided. Multiple base stations (BSs) serve the MDHO zone. By jointly precoding the modulated signals to be sent, the multiple BSs send the precoded signals to the multiple mobile stations (MSs) over the same time-frequency resources. The signal to be sent is transmitted to the multiple MSs in the MDHO zone. Due to the adoption of the precoding technique, each MS makes no or small interference to other MSs. Since the multiple BSs that serve one MDHO zone serve multiple MSs over the same time-frequency resources, the system capacity in the MDHO zone is greatly improved.
摘要:
A mobile terminal is provided in the present invention, comprising: a channel state information feedback calculating unit configured to calculate a channel state information feedback between the mobile terminal and a serving cell of the mobile terminal and those between the mobile terminal and all cooperating cells; a channel quality information feedback calculating unit configured to calculate a channel quality information feedback for the serving cell of the mobile terminal; and a transmission unit configured to transmit the channel state information feedbacks and the channel quality information feedback to the serving cell. The present invention greatly improves the performance of a LTE-A system and greatly reduces feedback overhead. The present invention is a scalable feedback solution and may be flexibly applied to various coordinated multipoint transmission scenarios.