Communication apparatus and communication method thereof
First Claim
1. A communication apparatus that performs data transmission employing a multicarrier communication method, the communication apparatus comprising:
- a phase vector modification unit that changes a phase vector corresponding to at least one of a plurality of subcarrier signals, so that different networks have different phase vectors, the plurality of subcarrier signals being included in a multicarrier signal; and
a phase rotator that rotates a phase of at least one of the plurality of subcarrier signals based on the phase vector changed by the phase vector modification unit.
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Abstract
The present invention is provided to improve transmission efficiency by preventing interference between different networks during data transmission using a multicarrier communication method. A transmitter includes a phase vector setting unit and a multicarrier modulator. The phase vector setting unit rotates a phase of transmission data corresponding to each subcarrier signal in an OFDM multicarrier signal, by generating a randomized phase vector for each subcarrier signal. The multicarrier modulator modulates the multicarrier signal as transmission data by using an inverse Fourier transform or an inverse wavelet transform. The phase vector setting unit changes a phase vector according to the status of a transmission line or the status of another network.
41 Citations
21 Claims
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1. A communication apparatus that performs data transmission employing a multicarrier communication method, the communication apparatus comprising:
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a phase vector modification unit that changes a phase vector corresponding to at least one of a plurality of subcarrier signals, so that different networks have different phase vectors, the plurality of subcarrier signals being included in a multicarrier signal; and
a phase rotator that rotates a phase of at least one of the plurality of subcarrier signals based on the phase vector changed by the phase vector modification unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A communication method by which data transmission is performed employing a multicarrier communication, the communication method comprising:
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changing a phase vector corresponding to at least one of a plurality of subcarrier signals, so that different networks have different phase vectors, the plurality of subcarrier signals being included in a multicarrier signal; and
rotating a phase of at least one of the plurality of subcarrier signals based on the changed phase vector. - View Dependent Claims (17, 18, 19)
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20. An integrated circuit that performs data transmission employing a multicarrier communication method, the integrated circuit comprising:
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a phase vector modification unit that changes a phase vector corresponding to at least one of a plurality of subcarrier signals, so that different networks have different phase vectors, the plurality of subcarrier signals being included in a multicarrier signal; and
a phase rotator that rotates a phase of at least one of the plurality of subcarrier signals based on the phase vector changed by the phase vector modification unit.
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21. A communication apparatus that performs data transmission via a power line employing a multicarrier communication method, the communication apparatus comprising:
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a vector generator configured to generate a phase vector, the phase vector being a set of coefficients indicating a rotation degree corresponding to each of a plurality of subcarriers;
a receiver configured to receive from another communication apparatus a multicarrier signal having the plurality of subcarriers, the multicarrier communication signal including network information regarding a network of the another communication apparatus;
a demodulator configured to demodulate the multicarrier communication signal based on each of the plurality of subcarriers to generate a plurality of signal points, each of the plurality of signal points corresponding to each of the plurality of subcarriers; and
a phase rotator configured to rotate each of the plurality of signal points on a complex coordinate plane, based on each of the coefficients the set of which is the phase vector generated by the generator, wherein the generator being further configured to change the phase vector generated by the generator into other phase vector, when each of the plurality of signal points rotated by the phase rotator indicates the network information included in the multicarrier communication signal.
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Specification