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US 12,244,371 B2Granted
Broadcast signal transmission method, broadcast signal transmission apparatus, broadcast signal reception method, and broadcast signal reception apparatus
AssigneeSun Patent Trust
InventorsYutaka Murakami, Tomohiro Kimura, Mikihiro Ouchi
Life of this patent
Estimating the term…
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.
Claims6
A communication apparatus comprising:
- a precoder which, in operation, applies a precoding matrix to a first modulated symbol sequence and to a second modulated symbol sequence to generate a first transmission symbol sequence and a second transmission symbol sequence, wherein the precoding matrix is selected from a first precoding matrix with a phase shift whose amount is switched periodically and a second precoding matrix without the phase shift, and wherein the amount of the phase shift is switched symbol by symbol and the phase shift is applied to one of the first modulated symbol sequence and the second modulated symbol sequence;
- and
- a transmitter which, in operation, transmits the first transmission symbol sequence and the second transmission symbol sequence from two or more antennas.
A communication method comprising:
- applying a precoding matrix to a first modulated symbol sequence and to a second modulated symbol sequence to generate a first transmission symbol sequence and a second transmission symbol sequence, wherein the precoding matrix is selected from a first precoding matrix with a phase shift whose amount is switched periodically and a second precoding matrix without the phase shift, and wherein the amount of the phase shift is switched symbol by symbol and the phase shift is applied to one of the first modulated symbol sequence and the second modulated symbol sequence;
- and
- transmitting the first transmission symbol sequence and the second transmission symbol sequence from two or more antennas.
Dependencies are inferred from the claim text.