METHOD OF SIGNAL GENERATION AND SIGNAL GENERATING DEVICE
First Claim
Patent Images
1. A signal generation method for generating, from a plurality of baseband signals, a plurality of signals for transmission on a common frequency band and at a common time, comprising the steps of:
- multiplying a first baseband signal s1 generated from a first set of bits by u, and multiplying a second baseband signal s2 generated from a second set of bits by v, where u and v denote real numbers different from each other;
performing a change of phase on each of the first baseband signal s1 multiplied by u and the second baseband signal s2 multiplied by v, thus generating a first post-phase-change baseband signal u×
s1′ and
a second post-phase-change baseband signal v×
s2′
; and
applying weighting according to a predetermined matrix F to the first post-phase-change baseband signal u×
s1′ and
to the second post-phase-change baseband signal v×
s2′
, thus generating the plurality of signals for transmission on the common frequency band and at the common time as a first weighted signal z1 and a second weighted signal z2, whereinthe first weighted signal z1 and the second weighted signal z2 satisfy the relation;
(z1,z2)T=F(u×
s1′
,v×
s2′
)T and the change of phase is performed on the first baseband signal s1 multiplied by u and the second baseband signal s2 multiplied by v by using a phase modification value sequentially selected from among N phase modification value candidates, each of the N phase modification value candidates being selected at least once within a predetermined period.
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Abstract
A transmission method simultaneously transmitting a first modulated signal and a second modulated signal at a common frequency performs precoding on both signals using a fixed precoding matrix and regularly changes the phase of at least one of the signals, thereby improving received data signal quality for a reception device.
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Citations
2 Claims
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1. A signal generation method for generating, from a plurality of baseband signals, a plurality of signals for transmission on a common frequency band and at a common time, comprising the steps of:
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multiplying a first baseband signal s1 generated from a first set of bits by u, and multiplying a second baseband signal s2 generated from a second set of bits by v, where u and v denote real numbers different from each other; performing a change of phase on each of the first baseband signal s1 multiplied by u and the second baseband signal s2 multiplied by v, thus generating a first post-phase-change baseband signal u×
s1′ and
a second post-phase-change baseband signal v×
s2′
; andapplying weighting according to a predetermined matrix F to the first post-phase-change baseband signal u×
s1′ and
to the second post-phase-change baseband signal v×
s2′
, thus generating the plurality of signals for transmission on the common frequency band and at the common time as a first weighted signal z1 and a second weighted signal z2, whereinthe first weighted signal z1 and the second weighted signal z2 satisfy the relation;
(z1,z2)T=F(u×
s1′
,v×
s2′
)Tand the change of phase is performed on the first baseband signal s1 multiplied by u and the second baseband signal s2 multiplied by v by using a phase modification value sequentially selected from among N phase modification value candidates, each of the N phase modification value candidates being selected at least once within a predetermined period.
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2. A signal generation apparatus for generating, from a plurality of baseband signals, a plurality of signals for transmission on a common frequency band and at a common time, comprising:
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a power changer multiplying a first baseband signal s1 generated from a first set of bits by u, and multiplying a second baseband signal s2 generated from a second set of bits by v, where u and v denote real numbers different from each other; a phase changer performing a change of phase on each of the first baseband signal s1 multiplied by u and the second baseband signal s2 multiplied by v, thus generating a first post-phase-change baseband signal u×
s1′ and
a second post-phase-change baseband signal v×
s2′
; anda weighting unit applying weighting according to a predetermined matrix F to the first post-phase-change baseband signal u×
s1′ and
to the second post-phase-change baseband signal v×
s2′
, thus generating the plurality of signals for transmission on the common frequency band and at the common time as a first weighted signal z1 and a second weighted signal z2, whereinthe first weighted signal z1 and the second weighted signal z2 satisfy the relation;
(z1,z2)T=F(u×
s1′
,v×
s2′
)Tand the change of phase is performed on the first baseband signal s1 multiplied by u and the second baseband signal s2 multiplied by v by using a phase modification value sequentially selected from among N phase modification value candidates, each of the N phase modification value candidates being selected at least once within a predetermined period.
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Specification