Broadcast signal transmission method, broadcast signal transmission apparatus, broadcast signal reception method, and broadcast signal reception apparatus

Abstract

Disclosed is a transmission scheme for transmitting a first modulated signal and a second modulated signal in the same frequency at the same time. According to the transmission scheme, a precoding weight multiplying unit multiplies a precoding weight by a baseband signal after a first mapping and a baseband signal after a second mapping and outputs the first modulated signal and the second modulated signal. In the precoding weight multiplying unit, precoding weights are regularly hopped.

Claims

1. A broadcast signal transmission method comprising: selecting one matrix from among N matrices F[i], wherein N is equal to an integer 9 and i is equal to an integer no less than 0 and no more than 8, by regularly hopping a phase change of 2/N, each of the N matrices F[i] being selected at least once in N slots in order to increase a capacity of reception data, the N matrices F[i] defining a precoding process that is performed on a plurality of modulated signals; and generating a first broadcast signal z1 and a second broadcast signal z2 for each of the plurality of slots by performing a precoding process, which corresponds to the matrix selected from among the N matrices F[i], on a first modulated signal s1 generated from a first set of bits including first video data or first audio data and a second modulated signal s2 generated from a second set of bits including second video data or second audio data; and transmitting the first broadcast signal z1 and the second broadcast signal z2 from a first antenna and a second antenna, respectively, in a broadcast frequency, the first broadcast signal z1 and the second broadcast signal z2 satisfying (z1, z2).sup.T=F[i] (s1, s2).sup.T, and the N matrices F[i] being expressed by the following equations: $F\left[i=0\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{\mathrm{j0}}& {}^j\end{array}\right),F\left[i=1\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{2}{9}}& {}^{j\left(\frac{2}{9}+\right)}\end{array}\right),F\left[i=2\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{4}{9}}& {}^{j\left(\frac{4}{9}+\right)}\end{array}\right),F\left[i=3\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{6}{9}}& {}^{j\left(\frac{6}{9}+\right)}\end{array}\right),F\left[i=4\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{8}{9}}& {}^{j\left(\frac{8}{9}+\right)}\end{array}\right),F\left[i=5\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{10}{9}}& {}^{j\left(\frac{10}{9}+\right)}\end{array}\right),F\left[i=6\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{12}{9}}& {}^{j\left(\frac{12}{9}+\right)}\end{array}\right),F\left[i=7\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{14}{9}}& {}^{j\left(\frac{14}{9}+\right)}\end{array}\right),\mathrm{and}$ $F\left[i=8\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{16}{9}}& {}^{j\left(\frac{16}{9}+\right)}\end{array}\right),$ wherein is a positive real number.

2. A broadcast signal transmission apparatus comprising: weighting information generating circuitry which, in operation, selects one matrix from among N matrices F[i], wherein N is equal to an integer 9 and i is equal to an integer no less than 0 and no more than 8, by regularly hopping a phase change of 2/N, each of the N matrices F[i] being selected at least once in N slots in order to increase a capacity of reception data, the N matrices F[i] defining a precoding process that is performed on a plurality of modulated signals; weighting circuitry which, in operation, generates a first broadcast signal z1 and a second broadcast signal z2 for each of the plurality of slots by performing a precoding process, which corresponds to the matrix selected from among the N matrices F[i], on a first modulated signal s1 generated from a first set of bits including first video data or first audio data and a second modulated signal generated from a second set of bits including second video data or second audio data; and transmission circuitry which, in operation, transmits the first broadcast signal z1 and the second broadcast signal z2 from a first antenna and a second antenna, respectively, in a broadcast frequency, the first broadcast signal z1 and the second broadcast signal z2 satisfying (z1, z2).sup.T=F[i] (s1, s2).sup.T, and the N matrices F[i] being expressed by the following equations: $F\left[i=0\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{\mathrm{j0}}& {}^j\end{array}\right),F\left[i=1\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{2}{9}}& {}^{j\left(\frac{2}{9}+\right)}\end{array}\right),F\left[i=2\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{4}{9}}& {}^{j\left(\frac{4}{9}+\right)}\end{array}\right),F\left[i=3\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{6}{9}}& {}^{j\left(\frac{6}{9}+\right)}\end{array}\right),F\left[i=4\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{8}{9}}& {}^{j\left(\frac{8}{9}+\right)}\end{array}\right),F\left[i=5\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{10}{9}}& {}^{j\left(\frac{10}{9}+\right)}\end{array}\right),F\left[i=6\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{12}{9}}& {}^{j\left(\frac{12}{9}+\right)}\end{array}\right),F\left[i=7\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{14}{9}}& {}^{j\left(\frac{14}{9}+\right)}\end{array}\right),\mathrm{and}$ $F\left[i=8\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{16}{9}}& {}^{j\left(\frac{16}{9}+\right)}\end{array}\right),$ wherein is a positive real number.

3. A broadcast signal reception method comprising: acquiring a reception signal including video data or audio data, the reception signal being obtained by receiving a first broadcast signal z1 and a second broadcast signal z2 respectively transmitted from a first antenna and a second antenna in the same broadcast frequency at the same time, the first broadcast signal z1 and the second broadcast signal z2 being generated through determined generation processing; and generating reception data by performing demodulation processing on the acquired reception signal, the determined generation processing involving: selecting one matrix from among N matrices F[i], wherein N is equal to an integer 9 and i is equal to an integer no less than 0 and no more than 8, by regularly hopping a phase change of 2/N, each of the N matrices F[i] being selected at least once in N slots in order to increase a capacity of reception data, the N matrices F[i] defining a precoding process that is performed on a plurality of modulated signals; and generating the first broadcast signal z1 and the second broadcast signal z2 for each of the plurality of slots by performing a precoding process, which corresponds to the matrix selected from among the N matrices F[i], on a first modulated signal s1 generated from a first set of bits including first video data or first audio data and a second modulated signal s2 generated from a second set of bits including second video data or second audio data, the first broadcast signal z1 and the second broadcast signal z2 satisfying (z1, z2).sup.T=F[i] (s1, s2).sup.T, and the N matrices F[i] being expressed by the following equations: $F\left[i=0\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{\mathrm{j0}}& {}^j\end{array}\right),F\left[i=1\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{2}{9}}& {}^{j\left(\frac{2}{9}+\right)}\end{array}\right),F\left[i=2\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{4}{9}}& {}^{j\left(\frac{4}{9}+\right)}\end{array}\right),F\left[i=3\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{6}{9}}& {}^{j\left(\frac{6}{9}+\right)}\end{array}\right),F\left[i=4\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{8}{9}}& {}^{j\left(\frac{8}{9}+\right)}\end{array}\right),F\left[i=5\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{10}{9}}& {}^{j\left(\frac{10}{9}+\right)}\end{array}\right),F\left[i=6\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{12}{9}}& {}^{j\left(\frac{12}{9}+\right)}\end{array}\right),F\left[i=7\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{14}{9}}& {}^{j\left(\frac{14}{9}+\right)}\end{array}\right),\mathrm{and}$ $F\left[i=8\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{16}{9}}& {}^{j\left(\frac{16}{9}+\right)}\end{array}\right),$ wherein is a positive real number.

4. A broadcast signal reception apparatus comprising: acquiring circuitry which, in operation, acquires a reception signal including video data or audio data, the reception signal being obtained by receiving a first broadcast signal z1 and a second broadcast signal z2 respectively transmitted from a first antenna and a second antenna in the same broadcast frequency at the same time, the first broadcast signal z1 and the second broadcast signal z2 being generated through determined generation processing; generating circuitry which, in operation, generates the reception data by performing demodulation processing on the acquired reception signal, the determined generation processing involving: selecting one matrix from among N matrices F[i], wherein N is equal to an integer 9 and i is equal to an integer no less than 0 and no more than 8, by regularly hopping a phase change of 2/N, each of the N matrices F[i] being selected at least once in N slots in order to increase a capacity of reception data, the N matrices F[i] defining a precoding process that is performed on a plurality of modulated signals; and generating the first broadcast signal z1 and the second broadcast signal z2 for each of the plurality of slots by performing a precoding process, which corresponds to the matrix selected from among the N matrices F[i], on a first modulated signal s1 generated from a first set of bits including first video data or first audio data and a second modulated signal s2 generated from a second set of bits including second video data or second audio data, the first broadcast signal z1 and the second broadcast signal z2 satisfying (z1, z2).sup.T=F[i] (s1, s2).sup.T, and the N matrices F[i] being expressed by the following equations: $F\left[i=0\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{\mathrm{j0}}& {}^j\end{array}\right),F\left[i=1\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{2}{9}}& {}^{j\left(\frac{2}{9}+\right)}\end{array}\right),F\left[i=2\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{4}{9}}& {}^{j\left(\frac{4}{9}+\right)}\end{array}\right),F\left[i=3\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{6}{9}}& {}^{j\left(\frac{6}{9}+\right)}\end{array}\right),F\left[i=4\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{8}{9}}& {}^{j\left(\frac{8}{9}+\right)}\end{array}\right),F\left[i=5\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{10}{9}}& {}^{j\left(\frac{10}{9}+\right)}\end{array}\right),F\left[i=6\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{12}{9}}& {}^{j\left(\frac{12}{9}+\right)}\end{array}\right),F\left[i=7\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{14}{9}}& {}^{j\left(\frac{14}{9}+\right)}\end{array}\right),\mathrm{and}$ $F\left[i=8\right]=\frac{1}{\sqrt{{}^2+1}}\left(\begin{array}{cc}{}^{\mathrm{j0}}& {}^{\mathrm{j0}}\\ {}^{j\frac{16}{9}}& {}^{j\left(\frac{16}{9}+\right)}\end{array}\right),$ wherein is a positive real number.

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