Abstract
A method for indicating a combination between a codeword and a layer in a MIMO communication system a layer mapping method and a data transmission method using the same are disclosed. A minimum number of codeword-layer mapping combinations from among all available combinations based on the numbers of all codewords and all layers are pre-defined in consideration of a ratio of a codeword to a layer a reception performance of a receiver and reduction of combinations so that a data transmission method using the predefined combinations is implemented. If a.specific one codeword is mapped to at least two layers a diversity gain can be acquired.
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Specification Information
Specification Information
Technologies
Family Information
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| Publication No | Technology | Declaration Information | Specification Information | Explicitly Disclosed | Patent Type | Status | National Phase Entries | |||||
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Technologies
Resource configuration Multiple-Input Multiple-Output(MIMO)/Massive MIMO
Product
Base Station (eNB/gNB)Access point
Use Cases
Wireless communication
Services
Data processing
Claim
1. A layer mapping method for spatial multiplexing in a Multi-Input Multi-Output (MIMO) system, the layer mapping method comprising:
generating codewords comprising a first codeword and a second codeword;
mapping the codewords to two or more layers according to one mapping combination from among a plurality of mapping combinations; and
precoding the two or more layers to be transmitted through multiple antennas, wherein the two or more layers are mapped to the multiple antennas based on a precoding matrix used for the precoding,
wherein the plurality of mapping combinations comprise first mapping combinations for one codeword and second mapping combinations for multiple codewords,
wherein the second mapping combinations for multiple codewords are used for transmitting the generated first codeword and second codeword, and
wherein the first mapping combinations comprise all possible mapping combinations for retransmitting one of the first codeword and the second codeword when there is an indication that the one of the first codeword and the second codeword was not received.
2. The layer mapping method according to claim 1, wherein the first codeword is mapped to a single layer and the second codeword is mapped to two layers, when a number of the codewords is two and three layers are employed by the MIMO system.
3. The layer mapping method according to claim 1, wherein the first codeword is mapped to two layers and the second codeword is mapped to another two layers, when a number of the codewords is two and four layers are employed by the MIMO system.
4. The layer mapping method according to claim 1, wherein three layers are employed by the MIMO system, and wherein the first codeword is mapped to a first layer from among the three layers, and the second codeword is mapped to a second layer and a third layer from among the three layers.
5. The layer mapping method according to claim 1, wherein four layers are employed by the MIMO system, and wherein the first codeword is mapped to a first layer and a second layer from among the four layers, and the second codeword is mapped to a third layer and a fourth layer from among the four layers.
6. A transmitter performing layer mapping for spatial multiplexing in a Multi-Input Multi-Output (MIMO) system, the transmitter comprising:
at least one antenna;
a mapper configured to map codewords comprising a first codeword and a second codeword to two or more layers according to one mapping combination from among a plurality of mapping combinations; and
a precoder configured to receive the layers and precode the layers to generate signals to be transmitted via the at least one antenna, wherein the precoder is further configured to map the layers to the at least one antennas based on a precoding matrix used for the precoding,
wherein the plurality of mapping combinations comprise first mapping combinations for one codeword and second mapping combinations for multiple codewords,
wherein the second mapping combinations for multiple codewords are used for transmitting the generated first codeword and second codeword, and
wherein the first mapping combinations comprise all possible mapping combinations for retransmitting one of the first codeword and the second codeword when there is an indication that the one of the first codeword and the second codeword was not received.
7. The transmitter according to claim 6, wherein the first codeword is mapped to a single layer and the second codeword is mapped to two layers, when a number of the codewords is two and three layers are employed by the MIMO system.
8. The transmitter according to claim 6, wherein the first codeword is mapped to two layers and the second codeword is mapped to another two layers, when a number of the codewords is two and four layers are employed by the MIMO system.
9. The transmitter according to claim 6, wherein three layers are employed by the MIMO system, and wherein the first codeword is mapped to a first layer from among the three layers, and the second codeword is mapped to a second layer and a third layer from among the three layers.
10. The transmitter according to claim 6, wherein four layers are employed by the MIMO system, and wherein the first codeword is mapped to a first layer and a second layer from among the four layers, and the second codeword is mapped to a third layer and a fourth layer from among the four layers.
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The information in purple was extracted from the FrandAvenue
Explicitly disclosed patent:openly and comprehensibly describes all details of the invention in the patent document.
Implicitly disclosed patent:does not explicitly state certain aspects of the invention, but still allows for these to be inferred from the information provided.
Basis patent:The core patent in a family, outlining the fundamental invention from which related patents or applications originate.
Family member:related patents or applications that share a common priority or original filing.