摘要:
A method for interference alignment in wireless network having 3 transmitters and 3 receivers which are equipped with M antennas is provided. The method comprising: transmitting, performed by each of the 3 transmitters, a pilot signal known to the 3 receivers; estimating, performed by each of the 3 receivers, each channel from transmitter; transmitting, performed by each of the 3 receivers, feedback information to target transmitter; and determining, performed by transmitter 2 and transmitter 3, a precoding vector; wherein a degree of freedom(DoF) of a transmitter 1 is (M/2−α), a DoF of the transmitter 2 or the transmitter 3 is M/2.
摘要:
A method and apparatus for performing space division multiple access in wireless communications are disclosed. After the receipt of a set of training data from a base station, an estimated channel state information (CSI) is then generated by a mobile station. The CSI is subsequently quantized. The mobile station then determines whether or not the quantized CSI falls within a set of thresholds. If the quantized CSI falls within the set of thresholds, the mobile then sends feedback information to the base station to allow the base station to consider the mobile station as one of the mobile station candidates available for data communications. Otherwise, if the quantized CSI falls outside the set of thresholds, the mobile station then discards the quantized CSI.
摘要:
A Multi-Input Multi-Output (MIMO) downlink transmission control method that is related to communications technologies is disclosed in embodiments of the present invention. The method includes: obtaining a channel fading change rate and a feedback delay of a user; calculating out a closed-loop MIMO throughput gain according to the channel fading change rate and the feedback delay; and determining a downlink transmission mode according to the closed-loop MIMO throughput gain, wherein the downlink transmission mode includes a closed-loop mode or an open-loop mode. A MIMO downlink transmission control apparatus is also disclosed.
摘要:
A method for communicating between first multiple nodes and second multiple nodes in a wireless communication system is disclosed. The method includes the steps of performing a first local sharing procedure for a virtual MIMO (Multiple Input Multiple Output) feedback among the second multiple nodes during a first predetermined time; performing feedback of channel status information from the second multiple nodes to the first multiple nodes during a integer multiple of a second predetermined time; and performing a second local sharing procedure for the virtual MIMO feedback among the first multiple nodes during the first predetermined time.
摘要:
In a closed-loop wireless communication system, a codebook-based feedback mechanism is provided to enable non-unitary precoding for multi-stream transmission, where in each stream is optimized with suitable transmission power allocation and AMC. The codebook-based feedback mechanism uses a precoding codebook having a power allocation matrix which is constrained to specify that beamforming always applies full power to a predetermined beam. With this constraint, a one-bit power allocation feedback index may be used to switch between beamforming and spatial multiplexing.
摘要:
A feedback method for interference alignment in wireless network having K transmitters and K receivers is provides. The method comprising: transmitting, performed by transmitter n−1, a precoding vector of transmitter n−1 (n is a integer between 2 and K−1) to receiver n+1; calculating, performed by the receiver n+1, a precoding vector of transmitter n using the precoding vector of transmitter n−1; and transmitting, performed by the receiver n+1, the precoding vector of transmitter n to transmitter n.
摘要:
In a closed-loop wireless communication system, a codebook-based feedback mechanism is provided to enable non-unitary precoding for multi-stream transmission, where in each stream is optimized with suitable transmission power allocation and AMC. The codebook-based feedback mechanism uses a precoding codebook having a power allocation matrix which is constrained to specify that beamforming always applies full power to a predetermined beam. With this constraint, a one-bit power allocation feedback index may be used to switch between beamforming and spatial multiplexing.
摘要:
A method for communicating between first multiple nodes and second multiple nodes in a wireless communication system is disclosed. The second multiple nodes may perform a first local sharing procedure for a virtual MIMO (Multiple Input Multiple Output) feedback during a first predetermined time. And then, the second multiple nodes may transmit feedback of channel status information to the first multiple nodes during an integer multiple of a second predetermined time. Finally, the first multiple nodes may perform a second local sharing procedure for the virtual MIMO feedback during the first predetermined time.
摘要:
A power control method for interference alignment in wireless network having K transmitters and K receivers is provided. The method includes: receiving, performed by receiver n (n is an integer, 1≦n≦K−1), a power indication signal of transmitter n+1 from the transmitter n+1; determining, performed by the receiver n, power of transmitter n; and transmitting, performed by the receiver n, a power indication signal of transmitter n to the transmitter n, wherein the power of transmitter n is determined based on a residual interference of the receiver n, and the power indication signal of transmitter n indicates a minimum transmission power or a maximum transmission power of transmitter n.
摘要:
In a closed-loop wireless communication system, a codebook-based feedback mechanism is provided where each codeword indicates a particular profile to be used to provide a target performance measure (e.g., bit error rate or spectral efficiency) for the transmission channel. This may be accomplished by using a multi-stage quantization process to construct the codewords as a plurality of transmission parameters specifying a MIMO transmission scheme, precoding vector or matrix, power allocation in space/time/frequency, modulation and channel code.