Wireless communication system, wireless communication device, and wireless communication method
A wireless communication system includes a transmitting device and a receiving device each including a plurality of antennas. A plurality of streams are subjected to spatial multiplexing and are transmitted in a downlink in which packets are transmitted from the transmitting device to the receiving device. In the transmitting device, each of the plurality of transmission streams is divided into a plurality of bit-series groups having decoding characteristics to which priority levels are assigned, the bit-series groups are subjected to encoding processes and modulating processes in accordance with the priority levels and further subjected to weighting and synthesizing, and each of the plurality of transmission streams in which a plurality of bit series items are synthesized with one another is spatially multiplexed and transmitted.
1. A wireless communication apparatus, comprising:
circuitry configured to, for each block of bits,
encode each block according to an assigned encoding rate,
modulate each respective encoded block according to an assigned modulation method according to a data attribute of the respective encoded block, wherein the assigned modulation method is different for each encoded block, and the encoded blocks are mapped to different signal points based on the assigned modulation methods, and
weight, using a weight factor, each modulated block according to an assigned amplitude level and based on a priority level associated with the modulated block, wherein the assigned amplitude level is different for each modulated block, and weighting according to a higher amplitude level as the assigned amplitude level is performed on modulated blocks of higher priority levels while weighting according to a lower amplitude level as the assigned amplitude level is performed on modulated blocks of lower priority levels,
wherein the circuitry is further configured to
generate a plurality of transmission streams, each individual transmission stream of the plurality of transmission streams being generated by performing data multiplexing by synthesizing at least two weighted blocks of the plurality of weighted blocks to form a single respective stream,
up-convert through digital to analog (DA) conversion and radio frequency (RF) conversion into wireless signals, and
transmit the plurality of transmission streams from a plurality of transmission antennas.
2. The wireless communication apparatus according to claim 1 ,
wherein the circuitry is further configured to transmit control information representing at least one of encoding methods, encoding rates, modulation methods, or amplitude levels.
3. A wireless communication apparatus, comprising:
circuitry configured to
receive, using a plurality of receiving antennas, wireless signals transmitted through spatial multiplexing,
down-convert the received wireless signals through radio frequency (RF) conversion and analog to digital (AD) conversion,
spatially demultiplex the received signals so as to obtain a plurality of received streams, wherein each individual stream of the plurality of received streams that has been obtained through spatial demultiplexing is further data demultiplexed to obtain at least two separate bit-series of blocks that have, for each respective block of the blocks, been:
encoded according to an assigned encoding rate;
modulated, after the encoding, according to an assigned modulation method according to a data attribute of the respective block, wherein the assigned modulation method is different for each block, and the blocks have been mapped to different signal points based on the assigned modulation methods; and
weighted, after the modulation, using a weight factor, according to an assigned amplitude level and based on a priority level associated with the modulated block, wherein the assigned amplitude level is different for each modulated block, and weighting according to a higher amplitude level as the assigned amplitude level is performed on modulated blocks of higher priority levels while weighting according to a lower amplitude level as the assigned amplitude level is performed on modulated blocks of lower priority levels, and
decode and demodulate the received streams, the respective amplitude levels, the respective encoding rates, and the respective modulation methods of each of the blocks,
wherein the circuitry is further configured to perform the demodulation and the decoding of the respective received streams sequentially according to the respective amplitude levels given that the other received streams with lower amplitude levels are noise.
4. The wireless communication apparatus according to claim 3 ,
wherein the circuitry is further configured to receive control information representing at least one of encoding methods, encoding rates, modulation methods, or amplitude levels.