Data transmitting and receiving method using phase shift based precoding and transceiver supporting the same
View Patent ↗A method for performing a precoding based on a generalized phase shift or a precoding based on an extended phase shift in a Multi-Input Multi-Output (MIMO) system employing several sub-carriers, and a transceiver for supporting the same are disclosed. A phase-shift-based precoding matrix is generalized by multiplying a diagonal matrix for a phase shift by a unitary matrix for maintaining orthogonality between sub-carriers. In this case, a diagonal matrix part may be extended by multiplying a precoding matrix for removing an interference between sub-carriers by a diagonal matrix for a phase shift. By generalization and extension of the phase-shift-based precoding, a transceiver is more simplified, and a communication efficiency increases.
1. A method for transmitting signals at a transmitter of a Multi-Input Multi-Output (MIMO) system using a plurality of antennas, the method comprising:
encoding input signals of an encoder to output (R) streams of signals, wherein (R) corresponds to a rank predetermined among {R1, R2, . . . , Rm}, wherein (m) is a predetermined integer number;
performing a precoding on the (R) streams of signals at a precoder using a precoding matrix selected from a subset for (R) of a codebook, wherein the subset for (R) comprises (N R restrict ) precoding matrices, wherein (N R restrict ) is independently determined based on (R); and
transmitting the precoded signals to a receiver,
wherein:
(N Ri restrict )≧(N Rj restrict ) when a subset for (Ri) comprises (N Ri restrict ) precoding matrices and a subset for (Rj) comprises (N Ri restrict ) precoding matrices;
Ri and Rjε{R1, R2, . . . , Rm}; and
Ri<Rj.
2. The method of claim 1 , wherein (N 2 restrict )=4 and (N 4 restrict )=1.
3. The method of claim 1 , wherein:
each of the (N R restrict ) precoding matrices has an index (i), (i)=0, 1, . . . , (N R restrict )−1,
the selected precoding matrix is selected according to (i)=(s) mod (N restrict ); and
‘mod’ indicates a modulo operation, (s) is a variable that changes every (v) contiguous resource indices, and (v) is a predetermined integer value.
4. A transceiver for transmitting signals in a Multi-Input Multi-Output (MIMO) system, the transceiver comprising:
an encoder for encoding input signals to output (R) streams of signals, wherein (R) corresponds to a rank predetermined among {R1, R2, . . . , Rm}, wherein (m) is a predetermined integer number;
a precoder for performing a precoding on the (R) streams of signals using a precoding matrix selected from a subset for (R) of a codebook, wherein the subset for (R) comprises (N R restrict ) precoding matrices, wherein (N R restrict ) is independently determined based on (R); and
a plurality of antennas for transmitting the precoded signals to a receiver,
wherein:
(N Ri restrict )≧(N Rj restrict ) when a subset for (Ri) comprises (N Ri restrict ) precoding matrices and a subset for (Rj) comprises (N Ri restrict ) precoding matrices;
Ri and Rjε{R1, R2, . . . , Rm}; and
Ri<Rj.
5. The transceiver of claim 4 , wherein (N 2 restrict )=4 and (N 4 restrict )=1.
6. The transceiver of claim 4 , wherein:
each of the (N R restrict ) precoding matrices has an index (i), (i)=0, 1, . . . , (N R restrict )−1; the selected precoding matrix is selected according to (i)=(s) mod (N restrict ); and
‘mod’ indicates a modulo operation, (s) is a variable which that changes every (v) contiguous resource indices, and (v) is a predetermined integer value.
7. A method for receiving signals at a receiver of a Multi-Input Multi-Output (MIMO) system, the method comprising:
receiving the signals, the signal transmitted from a transmitter using a plurality of antennas;
acquiring (R) streams using a precoding matrix selected from a subset for (R) of a codebook, wherein the subset for (R) comprises (N R restrict ) precoding matrices, wherein (N R restrict ) is independently determined based on (R); and
decoding the (R) streams to acquire transmission information at a decoder,
wherein:
(N Ri restrict )≧(N Rj restrict ) when a subset for (Ri) comprises (N Ri restrict ) precoding matrices and a subset for (Rj) comprises (N Rj restrict ) precoding matrices;
Ri and Rjε{R1, R2, . . . , Rm}; and
Ri<Rj.
8. The method of claim 7 , wherein (N 2 restrict )=4 and (N 4 restrict )=1.
9. The method of claim 7 , wherein:
each of the (N R restrict ) precoding matrices has an index (i), (i)=0, 1, . . . , (N R restrict )−1; the selected precoding matrix is selected according to (i)=(s) mod (N restrict ); and
‘mod’ indicates a modulo operation, (s) is a variable that changes every (v) contiguous resource indices, and (v) is a predetermined integer value.
10. A transceiver for receiving signals in a Multi-Input Multi-Output (MIMO) system, the transceiver comprising:
a reception antenna for receiving the signals, the signals transmitted from a transmitter using a plurality of transmission antennas;
a MIMO decoder for acquiring (R) streams using a precoding matrix selected from a subset for (R) of a codebook, wherein the subset for (R) comprises (N R restrict ) precoding matrices, wherein (N R restrict ) is independently determined based on (R); and
a decoder for decoding the (R) streams to acquire transmission information,
wherein:
(N Ri restrict )≧(N Rj restrict ) when a subset for (Ri) comprises N Ri restrict ) precoding matrices and a subset for (Rj) comprises (N Rj restrict ) precoding matrices;
Ri and Rjε{R1, R2, . . . , Rm}; and
Ri<Rj.
11. The transceiver of claim 10 , wherein (N 2 restrict )=4 and (N 4 restrict )=1.
12. The transceiver of claim 10 , wherein:
each of the (N R restrict ) precoding matrices has an index (i), (i)=0, 1, . . . , (N R restrict )−1; the selected precoding matrix is selected according to (i)=(s) mod (N restrict ); and
‘mod’ indicates a modulo operation, (s) is a variable which that changes every (v) contiguous resource indices, and (v) is a predetermined integer value.