# US 2018/0323833 A1 · Transmission method, transmission device, reception method, and reception device

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- Number: US 2018/0323833 A1
- Document ID: US20180323833A1
- Status: Published application
- Kind: A1
- Application number: 16/031,301
- Filed: 2018-07-10
- Published: 2018-11-08
- Earliest claimed: 2010-10-18
- Assignees: Sun Patent Trust
- Applicants: Sun Patent Trust
- Inventors: Yutaka MURAKAMI; Tomohiro KIMURA; Mikihiro OUCHI
- Web page: https://patentgrep.com/patent/US20180323833A1

## CPC

- H04L 27/2602: {Signal structure}
- H04B 7/0417: Feedback systems
- H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B 7/046: {taking physical layer constraints into account}
- H04B 7/0478: {Special codebook structures directed to feedback optimisation}
- H04L 1/0042: {Encoding specially adapted to other signal generation operation, e.g. in order to reduce transmit distortions, jitter, or to improve signal shape (H04L1/0067 takes precedence)}
- H04L 1/007: {Unequal error protection (for format H04L1/0078; for codes per se H03M13/35)}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 25/0391: {construction details of matrices}
- H04L 25/03942: {switching between different codebooks}
- H04L 25/4906: {using binary codes}
- H04L 27/2032: {for discrete phase modulation, e.g. in which the phase of the carrier is modulated in a nominally instantaneous manner}
- H04L 27/22: Demodulator circuits; Receiver circuits
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 5/0023: {Time-frequency-space}
- H04L 5/0046: {Determination of the number of bits transmitted on different sub-channels}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 27/2601: {Multicarrier modulation systems}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION

## Abstract

Provided is a precoding method for generating, from a plurality of baseband signals, a plurality of precoded signals to be transmitted over the same frequency bandwidth at the same time, including the steps of selecting a matrix F[i] from among N matrices, which define precoding performed on the plurality of baseband signals, while switching between the N matrices, i being an integer from 0 to N−1, and N being an integer at least two, generating a first precoded signal z1 and a second precoded signal z2, generating a first encoded block and a second encoded block using a predetermined error correction block encoding method, generating a baseband signal with M symbols from the first encoded block and a baseband signal with M symbols the second encoded block, and precoding a combination of the generated baseband signals to generate a precoded signal having M slots.

## Claims

### Claim 1

A transmission method executed by a transmission system, the transmission method comprising:
generating a plurality of first transmission symbols z1 and a plurality of second transmission symbols z2 for each slot by using N signal processes with respect to a plurality of first modulated symbols s1 and a plurality of second modulated symbols s2, the plurality of first modulated symbols s1 including one or more first data symbols and one or more first pilot symbols, the plurality of second modulated symbols s2 including one or more second data symbols and one or more second pilot symbols, the one or more first data symbols being generated with the same transmission data bits as the one or more second data symbols, N being an integer that is at least three, the N signal processes being regularly switched with N slots as one cycle;
transmitting a plurality of first OFDM symbols from a first antenna, the plurality of first transmission signals z1 being arranged in the plurality of first OFDM symbols; and
transmitting a plurality of second OFDM symbols from a second antenna, the plurality of second transmission symbols z2 being arranged in the plurality of second OFDM symbols, the plurality of first OFDM symbols and the plurality of second OFDM symbols that are transmitted at a same frequency and time, wherein
the plurality of first OFDM symbols and the plurality of second OFDM symbols each include one or more control symbols transmitting control information used in demodulation, and
the N signal processes being not performed on the one or more control symbols.

### Claim 2

A transmission system comprising:
signal processing circuitry which, in operation, generates a plurality of first transmission symbols z1 and a plurality of second transmission symbols z2 for each slot by using N signal processes with respect to a plurality of first modulated symbols s1 and a plurality of second modulated symbols s2, the plurality of first transmission symbols z1 including one or more first data symbols and one or more first pilot symbols, the plurality of second transmission symbols z2 including one or more second data symbols and one or more second pilot symbols, the one or more first data symbols being generated with the same transmission data bits as the one or more second data symbols, N being an integer that is at least three, the N signal processes being regularly switched with a plurality of slots as one cycle;
transmitting circuitry which, in operation, transmits a plurality of first OFDM symbols from a first antenna, the plurality of first transmission symbols z1 being arranged in the plurality of first OFDM symbols, and transmits a plurality of second OFDM symbols from a second antenna, the plurality of second transmission symbols z2 being arranged in the plurality of second OFDM symbols, the plurality of first OFDM symbols and the plurality of second OFDM symbols that are transmitted at a same frequency and time, wherein
the plurality of first OFDM symbols and the plurality of second OFDM symbols each include one or more control symbols transmitting control information used in demodulation, and
the N signal processes being not performed on the one or more control symbols.

### Claim 3

A reception method executed by a reception device, the reception method comprising:
receiving first OFDM symbols transmitted from a first antenna of a transmission system and second OFDM symbols transmitted from a second antenna of the transmission system, wherein
the first OFDM symbols includes a plurality of first transmission symbols z1, the second OFDM symbols includes a plurality of second transmission symbols z2,
the plurality of first transmission symbols z1 and the plurality of second transmission symbols z2 are generated by, with respect to a plurality of first modulated symbols s1 and a plurality of second modulated symbols s2, using N signal processes for each slot, N being an integer that is at least three,
the plurality of first modulated symbols s1 including one or more first data symbols and one or more first pilot symbols, the plurality of second modulated symbols s2 including one or more second data symbols and one or more second pilot symbols, the one or more first data symbols being generated with the same transmission data bits as the one or more second data symbols,
the N signal processes being regularly switched with N slots as one cycle, and
the first OFDM symbols and the second OFDM symbols each include one or more control symbols transmitting control information used in demodulation, the N signal processes being not performed on the one or more control symbols, and
generating the transmission data bits by demodulating the one or more first data symbols and the one or more second data symbols based on the control information generated by demodulating the one or more control symbols.

### Claim 4

A reception device comprising:
receiving circuitry which, in operation, receives first OFDM symbols transmitted from a first antenna of a transmission system and second OFDM symbols transmitted from a second antenna of the transmission system, wherein
the first OFDM symbols includes a plurality of first transmission symbols z1, the second OFDM symbols includes a plurality of second transmission symbols z2,
the plurality of first transmission symbols z1 and the plurality of second transmission symbols z2 are generated by, with respect to a plurality of first modulated symbols s1 and a plurality of second modulated symbols s2, using N signal processes for each slot, N being an integer that is at least three,
the plurality of first modulated symbols s1 including one or more first data symbols and one or more first pilot symbols, the plurality of second modulated symbols s2 including one or more second data symbols and one or more second pilot symbols, the one or more first data symbols being generated with the same transmission data bits as the one or more second data symbols,
the N signal processes being regularly switched with N slots as one cycle, and
the first OFDM symbols and the second OFDM symbols each include one or more control symbols transmitting control information used in demodulation, the N signal processes being not performed on the one or more control symbols, and
demodulating circuitry which, in operation, generates the transmission data bits by demodulating the one or more first data symbols and the one or more second data symbols based on the control information generated by demodulating the one or more control symbols.