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 transmission method for a base station apparatus comprising: generating control information indicating whether or not to execute a precoding process that regularly changes phase with respect to first modulated symbols s1 and second modulated symbols s2; mapping the control information to control information symbols by using a mapper; and transmitting the control information symbols from one or more antennas to a terminal apparatus, wherein in a case of executing the precoding process, first symbols z1 and second symbols z2 to be transmitted from the one or more antennas to the terminal apparatus are generated by applying the precoding process, by using a precoder, on the first modulated symbols s1 and the second modulated symbols s2 by using a matrix selected from among 2 matrices F[i] to generate the first symbols z1 and the second symbols z2, i being equal to an integer 0 and 1; and applying a transmission to the first symbols z1 and the second symbols z2 from the one or more antennas, wherein the 2 matrices F[i] is regularly changing a phase of the first modulated symbols s1 and a phase of the second modulated symbols s2, each of the 2 matrices F[i] is selected at least once in 2 symbols, the first symbols z1 and the second symbols z2 satisfy (z1, z2).sup.T=F[i] (s1, s2).sup.T, and the 2 matrices F[i] are expressed by the following equations: $F\left[i\right]=\frac{1}{\sqrt{2}}\left(\begin{array}{cc}{e}^{j0}& e^{j0}\\ e^{j{?}_{21}\left(i\right)}& e^{j\left({?}_{21}\left(i\right)+?\right)}\end{array}\right)$ ${?}_{21}\left(0\right)=0,{?}_{21}\left(1\right)=\frac{?}{2}.$

2. A base station apparatus comprising: control information generating circuitry that, in operation, generates control information indicating whether or not to execute a precoding process that regularly changes phase with respect to first modulated symbols s1 and second modulated symbols s2; mapping circuitry that, in operation, maps the control information to control information symbols; and transmission circuitry that, in operation, transmits the control information symbols from one or more antennas to a terminal apparatus, wherein in a case of executing the precoding process, first symbols z1 and second symbols z2 to be transmitted to the terminal apparatus are generated by applying the precoding process, by using a precoder, on the first modulated symbols s1 and the second modulated symbols s2 by using a matrix selected from among 2 matrices F[i] to generate the first symbols z1 and the second symbols z2, i being equal to an integer 0 and 1; and applying a transmission to the first symbols z1 and the second symbols z2 from the one or more antennas, wherein the 2 matrices F[i] is regularly changing a phase of the first modulated symbols s1 and a phase of the second modulated symbols s2, each of the 2 matrices F[i] is selected at least once in 2 symbols, the first symbols z1 and the second symbols z2 satisfy (z1, z2).sup.T=F[i] (s1, s2).sup.T, and the 2 matrices F[i] are expressed by the following equations: $F\left[i\right]=\frac{1}{\sqrt{2}}\left(\begin{array}{cc}{e}^{j0}& e^{j0}\\ e^{j{?}_{21}\left(i\right)}& e^{j\left({?}_{21}\left(i\right)+?\right)}\end{array}\right)$ ${?}_{21}\left(0\right)=0,{?}_{21}\left(1\right)=\frac{?}{2}.$

3. A reception method for a terminal apparatus comprising: receiving control information symbols and a plurality of data symbols with one or more antennas; detecting, from the control information symbols, control information indicating whether or not a precoding process is executed with respect to a plurality of data symbols; and applying a decoding process, by using a decoder, on the plurality of data symbols based on the detection result of the control information symbols, wherein in a case of executing the precoding process, a base station apparatus generates first symbols z1 and second symbols z2, to be transmitted from one or more antennas of the base station apparatus to the terminal apparatus, by applying the precoding process, by using a precoder, on first modulated symbols s1 and second modulated symbols s2 by using a matrix selected from among 2 matrices F[i] to generate the first symbols z1 and the second symbols z2, i being equal to an integer 0 and 1; and applying a transmission to the first symbols z1 and the second symbols z2 from the one or more antennas of the base station apparatus, wherein the 2 matrices F[i] is regularly changing a phase of the first modulated symbols s1 and a phase of the second modulated symbols s2, each of the 2 matrices F[i] is selected at least once in 2 symbols, the first symbols z1 and the second symbols z2 satisfy (z1, z2).sup.T=F[i] (s1, s2).sup.T, and the 2 matrices F[i] are expressed by the following equations: $F\left[i\right]=\frac{1}{\sqrt{2}}\left(\begin{array}{cc}{e}^{j0}& e^{j0}\\ e^{j{?}_{21}\left(i\right)}& e^{j\left({?}_{21}\left(i\right)+?\right)}\end{array}\right)$ ${?}_{21}\left(0\right)=0,{?}_{21}\left(1\right)=\frac{?}{2}.$

4. A terminal apparatus comprising: reception circuitry that, in operation, receives control information symbols and a plurality of data symbols with one or more antennas; detecting circuitry that, in operation, detects, from the control information symbols, control information indicating whether or not a precoding process is executed with respect to a plurality of data symbols; and decoding circuitry that, in operation, applies a decoding process to the plurality of data symbols based on the detection result of the control information symbols, wherein in a case of executing the precoding process, a base station apparatus generates first symbols z1 and second symbols z2, to be transmitted from one or more antennas of the base station apparatus to the terminal apparatus, by applying the precoding process, by using a precoder, on first modulated symbols s1 and second modulated symbols s2 by using a matrix selected from among 2 matrices F[i] to generate the first symbols z1 and the second symbols z2, i being equal to an integer 0 and 1; and applying a transmission to the first symbols z1 and the second symbols z2 from the one or more antennas of the base station apparatus, wherein the 2 matrices F[i] is regularly changing a phase of the first modulated symbols s1 and a phase of the second modulated symbols s2, each of the 2 matrices F[i] is selected at least once in 2 symbols, the first symbols z1 and the second symbols z2 satisfy (z1, z2).sup.T=F[i] (s1, s2).sup.T, and the 2 matrices F[i] are expressed by the following equations: $F\left[i\right]=\frac{1}{\sqrt{2}}\left(\begin{array}{cc}{e}^{j0}& e^{j0}\\ e^{j{?}_{21}\left(i\right)}& e^{j\left({?}_{21}\left(i\right)+?\right)}\end{array}\right)$ ${?}_{21}\left(0\right)=0,{?}_{21}\left(1\right)=\frac{?}{2}.$

Description

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