Precoding method, transmitting device, and receiving device

Abstract

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 wireless base station apparatus comprising: control signal generation circuitry that generates a control signal indicating whether or not to perform a precoding process on two signals; and transmission circuitry that transmits the control signal to a wireless terminal apparatus, wherein in a case of performing the precoding process, two transmission signals to be transmitted to the wireless terminal apparatus are generated by: applying a power adjustment to the two signals, applying the precoding process to the two signals while regularly switching between elements in a matrix in accordance with Equation 1, and applying a transmission to the two signals from different antennas at a same frequency and at a same time, wherein Equation 1 is expressible as: $F\left[i\right]=\frac{1}{\sqrt{2}}\left(\begin{array}{cc}{e}^{j0}& e^{j0}\\ e^{j{}_{21}\left(i\right)}& e^{j\left({}_{21}\left(i\right)+\right)}\end{array}\right),\mathrm{and}$ ${}_{21}\left(0\right)=0,{}_{21}\left(1\right)=\frac{}{2},$ where .sub.21(i) is a function with a variable i that is a set of 0 and 1.

2. A transmission method for a wireless base station apparatus comprising: generating a control signal indicating whether or not to perform a precoding process on two signals; and transmitting the control signal to the wireless terminal apparatus, wherein in a case of performing the precoding process, two transmission signals to be transmitted to the wireless terminal apparatus are generated by: applying a power adjustment to the two signals, applying the precoding process to the two signals, while regularly switching between elements in a matrix in accordance with Equation 2, and applying a transmission to the two signals from different antennas at a same frequency and at a same time, wherein Equation 2 is expressible as: $F\left[i\right]=\frac{1}{\sqrt{2}}\left(\begin{array}{cc}{e}^{j0}& e^{j0}\\ e^{j{}_{21}\left(i\right)}& e^{j\left({}_{21}\left(i\right)+\right)}\end{array}\right),\mathrm{and}$ ${}_{21}\left(0\right)=0,{}_{21}\left(1\right)=\frac{}{2},$ where .sub.21(i) is a function with a variable i that is a set of 0 and 1.

3. A wireless terminal apparatus comprising: reception circuitry that receives a control signal and a plurality of data reception signals transmitted from a wireless base station apparatus, the control signal indicating whether or not a precoding process is applied with respect to the plurality of data reception signals; and decoding circuitry that decodes the plurality of data reception signals based on the control signal, wherein in a case of executing the precoding process, two signals to be transmitted to the wireless terminal apparatus are generated by: applying a power adjustment to the two signals, applying the precoding process to the two signals while regularly switching between elements in a matrix in accordance with Equation 3, and applying a transmission to the two signals from different antennas at a same frequency and at a same time, wherein Equation 3 is expressible as: $F\left[i\right]=\frac{1}{\sqrt{2}}\left(\begin{array}{cc}{e}^{j0}& e^{j0}\\ e^{j{}_{21}\left(i\right)}& e^{j\left({}_{21}\left(i\right)+\right)}\end{array}\right),\mathrm{and}$ ${}_{21}\left(0\right)=0,{}_{21}\left(1\right)=\frac{}{2},$ where .sub.21(i) is a function with a variable i that is a set of 0 and 1.

4. A reception method for a wireless terminal apparatus comprising: receiving a control signal and a plurality of data reception signals transmitted from a wireless base station apparatus, the control signal indicating whether or not a precoding process is applied with respect to the plurality of data reception signals; and decoding the plurality of data reception signals based on the control signal, wherein in a case of executing the precoding process, two signals to be transmitted to the wireless terminal apparatus are generated by: applying a power adjustment to the two signals, applying the precoding process to the two signals while regularly switching between elements in a matrix in accordance with Equation 4, and applying a transmission to the two signals from different antennas at a same frequency and at a same time, wherein Equation 4 is expressible as: $F\left[i\right]=\frac{1}{\sqrt{2}}\left(\begin{array}{cc}{e}^{j0}& e^{j0}\\ e^{j{}_{21}\left(i\right)}& e^{j\left({}_{21}\left(i\right)+\right)}\end{array}\right),\mathrm{and}$ ${}_{21}\left(0\right)=0,{}_{21}\left(1\right)=\frac{}{2},$ where .sub.21(i) is a function with a variable i that is a set of 0 and 1.

Description

We had a problem displaying this patent description. If you need it, please contact us at support@ipiq.io.