Radio communication device and radio communication method
View Patent ↗It is possible to obtain the diversity effect in a plurality of slots while preventing complication of a scheduler or inefficient use of resources, to eliminate the phenomenon in which SINR significantly decreases in a specific slot, and to avoid deterioration of demodulation performance. In a radio communication system which performs transmission in a sub-frame unit having two slots temporally continuously arranged, when pre-coding is performed by multiplying a signal to be output to a plurality of antennas by a pre-coding weight, CDD is used to shift a phase such that the phase in the pre-coding weight is cyclically changed on the frequency axis. The phase shift amount to be applied by the CDD is set to change by 2π in an allocated resource block (1RB) of the local device, and PVS is applied such that the phase shift amount differs by π between the weight W 0 of the first half slot and the weight W 1 of the second half slot in the sub-frame.
1. A radio communication device for use in a radio communication system, which performs transmission on a sub-frame basis having a first slot and a second slot temporally continuously arranged, the radio communication device comprising:
a pre-coding multiplication section that performs pre-coding to form a predetermined beam by multiplying a signal to be output to a plurality of antennas by a pre-coding weight, and uses cyclic delay diversity to shift a phase such that the phase in the pre-coding weight is cyclically changed on a frequency axis;
a phase shift amount instruction section that instructs that a phase shift amount to be applied by the pre-coding multiplication section is changed by 2π within an allocated resource block of the radio communication device, and assigns the phase shift amount for the pre-coding multiplication section such that the phase shift amount differs by π between the first slot and the second slot in an allocated sub-frame of the radio communication device, wherein the first slot and the second slot are arranged continuously in time; and
a transmitting section that transmits a transmission signal including the signal subjected to the pre-coding to a receiving device as the other communication party.
2. The radio communication device according to claim 1 ,
wherein the transmitting section performs communication based on SC-FDMA; and
wherein the phase shift amount instruction section assigns the phase shift amount such that the phase shift amount differs between SC-FDMA symbols.
3. The radio communication device according to claim 2 ,
wherein the phase shift amount instruction section assigns the phase shift amount such that the phase shift amount differs by π between an odd-numbered symbol and an even-numbered symbol of the SC-FDMA symbols.
4. The radio communication device according to claim 2 ,
wherein the phase shift amount instruction section assigns the phase shift amount such that the phase shift amount is changed in a stepwise manner between the SC-FDMA symbols.
5. The radio communication device according to claim 1 , further comprising:
a control signal demodulation section that demodulates a control signal including space hopping information for directing space hopping through the pre-coding,
wherein the phase shift amount instruction section and the pre-coding multiplication section perform the pre-coding to execute the space hopping in generating the transmission signal on the basis of the space hopping information.
6. The radio communication device according to claim 1 ,
wherein the pre-coding uses pre-coding weights with different amplitudes between transmitting antennas.
7. The radio communication device according to claim 1 ,
wherein the pre-coding weight to be applied by the pre-coding multiplication section is applied such that the amplitude and delay amount in the pre-coding weight differ between the first slot and the second slot.
8. A radio communication base station apparatus comprising the radio communication device according to claim 1 .
9. A radio communication mobile station apparatus comprising the radio communication device according to claim 1 .
10. A radio communication method in a radio communication system, which performs transmission on a sub-frame basis having a first slot and a second slot temporally continuously arranged, the radio communication method comprising:
a pre-coding multiplication step of performing pre-coding to form a predetermined beam by multiplying a signal to be output to a plurality of antennas by a pre-coding weight; and
a transmitting step of transmitting a transmission signal including the signal subjected to the pre-coding to a receiving device as the other communication party,
wherein, in the pre-coding multiplication step, a cyclic delay diversity is used to shift a phase in the pre-coding weight such that the phase in the pre-coding weight is cyclically changed on a frequency axis, the phase shift amount is set to change by 2π within an allocated resource block of a radio communication device, and the phase shift amount is set to differ by π between the first slot and the second slot in an allocated sub-frame of the radio communication device, wherein the first slot and the second slot are arranged continuously in time.