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US 9,866,306 B2Granted
Signal generating method and signal generating device
AssigneeSun Patent Trust
InventorsYutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi
Life of this patent
Estimating the term…
Abstract
A transmission method for transmitting a first modulated signal and a second modulated signal in the same frequency at the same time. Each signal has been modulated according to a different modulation scheme. The transmission method applies precoding on both signals using a fixed precoding matrix, applies different power change to each signal, and regularly changes the phase of at least one of the signals, thereby improving received data signal quality for a reception device.
Claims6
A transmission method comprising:
- selecting either a first mode compatible with precoding processing and phase change processing of regularly switching a plurality of phase change patterns or a second mode compatible with the precoding processing and not compatible with the phase change processing;
- performing information setting of:
- when the first mode is selected, setting information indicating one of the plurality of phase change patterns to a first field of each transmission frame;
- and
- when the second mode is selected, setting information indicating a pattern of precoding matrices to be used in the precoding processing to a second field of each transmission frame and disabling the first field;
- performing generation of:
- when the first mode is selected, generating, for each transmission frame, a first precoded signal z1 and a second precoded signal z2 from a first modulated signal s1 and a second modulated signal s2 with use of a precoding matrix F[i] selected from among N precoding matrices as the one of the plurality of phase change patterns, where i is an integer no less than 0 and no more than N−1, and N is an integer 3 or greater, the first precoded signal z1 and the second precoded signal z2 satisfying (z1,z2)T=F[i](s1,s2)T, where (s1,s2)T is a transpose of a vector (s1,s2), and (z1,z2)T is a transpose of a vector (z1,z2);
- and
- when the second mode is selected, generating, for each transmission frame, a third precoded signal z3 and a fourth precoded signal z4 from the first modulated signal s1 and the second modulated signal s2 with use of a precoding matrix F1, the third precoded signal z3 and the fourth precoded signal z4 satisfying (z3,z4)T=F1(s1,s2)T, where (z3,z4)T is a transpose of a vector (z3,z4);
- and
- performing transmission of:
- when the first mode is selected, transmitting a first transmission signal that is based on the first precoded signal z1 and a second transmission signal that is based on the second precoded signal z2 at a first time at a first frequency;
- and
- when the second mode is selected, transmitting a third transmission signal that is based on the third precoded signal z3 and a fourth transmission signal that is based on the fourth precoded signal z4 at the first time at the first frequency.
11 more elements
A transmission apparatus comprising:
- mode selecting circuitry which, in operation,
- selects either a first mode compatible with precoding processing and phase change processing of regularly switching a plurality of phase change patterns or a second mode compatible with the precoding processing and not compatible with the phase change processing;
- and
- performs information setting of:
- when selecting the first mode, setting information indicating one of the plurality of phase change patterns to a first field of each transmission frame;
- and
- when selecting the second mode, setting information indicating a pattern of precoding matrices to be used in the precoding processing to a second field of each transmission frame and disabling the first field;
- precoding circuitry which, in operation,
- performs generation of:
- when the first mode is selected, generating, for each transmission frame, a first precoded signal z1 and a second precoded signal z2 from a first modulated signal s1 and a second modulated signal s2 with use of a precoding matrix F[i] selected from among N precoding matrices as the one of the plurality of phase change patterns, where i is an integer no less than 0 and no more than N−1, and N is an integer 3 or greater, the first precoded signal z1 and the second precoded signal z2 satisfying (z1,z2)T=F[i](s1,s2)T, where (s1,s2)T is a transpose of a vector (s1,s2), and (z1,z2)T is a transpose of a vector (z1,z2);
- and
- when the second mode is selected, generating, for each transmission frame, a third precoded signal z3 and a fourth precoded signal z4 from the first modulated signal s1 and the second modulated signal s2 with use of a precoding matrix F1, the third precoded signal z3 and the fourth precoded signal z4 satisfying (z3,z4)T=F1(s1,s2)T, where (z3,z4)T is a transpose of a vector (z3,z4);
- and
- transmission circuitry which, in operation,
- performs transmission of:
- when the first mode is selected, transmitting a first transmission signal that is based on the first precoded signal z1 and a second transmission signal that is based on the second precoded signal z2 at a first time at a first frequency;
- and
- when the second mode is selected, transmitting a third transmission signal that is based on the third precoded signal z3 and a fourth transmission signal that is based on the fourth precoded signal z4 at the first time at the first frequency.
15 more elements
Dependencies are inferred from the claim text.