摘要:
The invention relates to a first communication device for a wireless communication system (500), the first communication device (100) comprising: a processor (102), a cascade precoder (104) including an outer precoder (106) and an inner precoder (108), and a transceiver (110); wherein the processor (102) is configured to determine the inner precoder (108); wherein the transceiver (110) is configured to transmit a first pilot sequence (P1) to a second communication device (300), the first pilot sequence (P1) being precoded with the determined inner precoder (108) by the processor (102); wherein the transceiver (110) is configured to receive a first channel estimation (CHE1) from the second communication device (300) in response to the transmission of the first pilot sequence (P1); wherein the processor (102) is configured to determine the outer precoder (106) based on the first channel estimation (CHE1); wherein the transceiver (110) is configured to transmit at least one of a data sequence and a pilot sequence to the second communication device (300). Furthermore, the invention also relates to corresponding methods, a wireless communication system, a computer program, and a computer program product.
摘要:
A transmitting radio node (10) precodes a transmission from an antenna array (12) to a receiving radio node (50). The array (12) includes co-polarized antenna elements (14) aligned in a given spatial dimension of the array (12). The transmitting radio node (10) precodes the transmission from different subarrays (34a, 34b) of the antenna elements (14) using respective coarse-granularity precoders that are factorizable from a multi-granular precoder targeting the given spatial dimension of the array (12) at different granularities, so as to virtualize the subarrays (34a, 34b) as different auxiliary elements (38a, 38b). The transmitting radio node (10) also precode the transmission from the different auxiliary elements (38a, 38b) using one or more finer-granularity precoders that are also factorizable from the multi-granular precoder. In this case, the coarse granularity precoders and the one or more finer-granularity precoders are represented within one or more codebooks (26) used for said precoding.
摘要:
An enhanced Node B (eNB) for precoding is generally described. In some embodiments, a first precoding-matrix indicator (PMI) and a second PMI is received on an uplink channel from user equipment (UE). Symbols for multiple-input multiple output (MIMO) beamforming may be precoded by the eNB using a precoder matrix recommended by the first and second PMIs, for a MIMO downlink orthogonal frequency division multiple access (OFDMA) transmission. The first PMI and the second PMI are calculated by selecting a representative codeword that is indexed by i1 and i2 for a plurality of 2TX constituent beams indexed by k to define, from the plurality of 2TX constituent beams, the 2TX constituent beam that provides the best system evaluation metric. The i1 index for wideband and the i2 index for each subband are identified from the defined 2TX constituent beam.
摘要:
Enhanced channel state information (CSI) feedback is disclosed for full dimensional multiple input, multiple output (FD-MIMO) operations. In one aspect, a single CSI process is defined that is configured with an azimuth and elevation CSI-reference signal (RS) ports. A user equipment (UE) will send a precoding matrix indictor (PMI) report including a precoding matrix indicator (PMI) for the azimuth ports and a PMI for the elevation ports. One of the PMIs is assigned a low rank. The base station will use the two PMIs to create a whole channel precoding matrix. In another aspect, a single CSI process is configured having a plurality of CSI-RS resources. The UE generates channel measurement information for each of the CSI-RS resources, but only sets a CSI report to the base station of a subset of the total number of resources.
摘要:
There is provided a method and corresponding apparatus for determining a beamforming configuration for a multi-antenna system according to an embodiment. In general, the multi-antenna system has at least two antennas and a port-to-antenna mapping between antenna ports and antennas. The method comprises obtaining (S1) first feedback information originating from a wireless device relating to a multi-antenna transmission based on a first beamforming configuration including a first port-to-antenna mapping, and obtaining (S2) second feedback information originating from the wireless device relating to a multi-antenna transmission based on a second, different beamforming configuration including a second, different portto-antenna mapping. The method also comprises determining (S3), based on the first feedback information and the second feedback information, a third beamforming configuration for the multi-antenna system including a third port-to-antenna mapping to enable beamforming according to a third beam form.
摘要:
A method for operating a transmission point in a communications system includes receiving wideband feedback information at a first report rate (block 505), and receiving subband feedback information at a second report rate (block 505), wherein the first report rate is less than the second report rate. The method also includes performing dynamic rate selection for resource block groups (RBGs) of the communications system in accordance with the wideband feedback information and the subband feedback information (block 510).
摘要:
A base station includes a transceiver, and a processor configured to allocate at least one CSI-RS antenna port to a user equipment (UE), precode the at least one CSI-RS antenna port with a first precoding matrix, cause the transceiver to transmit the at least one CSI-RS antenna port precoded with the first precoding matrix through a channel to the UE, cause the transceiver to signal a number of the at least one antenna port to the UE, cause the transceiver to receive an index for a second precoding matrix from the UE, wherein the second precoding matrix is determined by the UE according to the at least one CSI-RS antenna port precoded with the first precoding matrix as received through the channel by the UE and the signaled number of the at least one antenna port, and precode transmission data with the first precoding matrix and the second precoding matrix.
摘要:
본 발명은 무선 통신 시스템에서 제 1 단말이 채널 상태 정보(Channel Status Information, CSI)를 보고하는 방법에 있어서, 기지국으로부터 제 1 단말을 포함하는 단말 그룹과 연관된 그룹 채널 상태 정보(Channel State Information, CSI) 보고 설정을 할당받는 단계, 그룹 채널 상태 정보(CSI) 보고 설정을 단말 그룹에 대하여 브로드캐스트(broadcast)하는 단계 및 그룹 채널 상태 정보를 기지국에 보고하는 단계를 포함하며, 단말 그룹은, 제 1 단말과 적어도 하나의 제 2 단말들로 구성되며, 그룹 채널 상태 정보 보고 설정은, 단말 그룹을 구성하는 다수의 단말들 각각에 대한 채널 상태 정보 중 일부와 대응되는 제 1 단말의 채널 상태 정보를, 그룹 채널 상태 정보로 정의하는 것을 특징으로 한다.
摘要:
A communication method of a user equipment in a mobile communication system. The method includes receiving a control signal from a base station, the control signal comprising at least one of: a first information element or a second information element; determining, if a field of the first information element is set to a predetermined value and a channel state information (CSI) reporting mode determined based on the second information element is a redetermined mode, a codebook based on the CSI reporting mode; generating a CSI based on the determined codebook, the CSI comprising at least one of a rank indicator (RI), a first precoding matrix indicator (PMI), or a second PMI; and reporting the generated CSI to the base station.