# US 12,224,791 B2 · Information processing apparatus, transmission-side apparatus and method

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- Number: US 12,224,791 B2
- Document ID: US12224791B2
- Status: Granted
- Kind: B2
- Application number: 18/471,707
- Filed: 2023-09-21
- Published: 2024-01-11
- Granted: 2025-02-11
- Earliest claimed: 2021-09-30
- Assignees: Toyota Jidosha Kabushiki Kaisha
- Applicants: Toyota Jidosha Kabushiki Kaisha
- Inventors: Kenichi Takizawa; Masafumi Moriyama
- Web page: https://patentgrep.com/patent/US12224791B2

## CPC

- H04B 1/62: for providing a predistortion of the signal in the transmitter and corresponding correction in the receiver, e.g. for improving the signal/noise ratio
- H04L 1/08: by repeating transmission, e.g. Verdan system {(H04L1/1858 and H04L1/189 take precedence)}
- H04B 1/1027: {assessing signal quality or detecting noise/interference for the received signal}
- H04J 11/003: {at the transmitter (transmission to multiple receive units in multiple input multiple output [MIMO] H04B7/0452; transmit antenna weighting H04B7/0615)}
- H04J 11/0036: {at the receiver}
- 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 27/26035: {Maintenance of orthogonality, e.g. for signals exchanged between cells or users, or by using covering codes or sequences (using different training sequence per antenna H04B7/0684; code allocation H04J13/16)}
- H04L 27/2613: {Structure of the reference signals}
- H04L 27/26132: {using repetition}
- H04L 27/3444: {by applying a certain rotation to regular constellations}
- H04B 2001/1045: {Adjacent-channel interference}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 27/2627: {Modulators}
- H04L 27/2649: {Demodulators}
- H04L 27/34: Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04W 52/242: {taking into account path loss}
- H04B: TRANSMISSION
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

When signals are simultaneously received from K transmission-side apparatuses by a receiving antenna, and repetition is performed by the K transmission-side apparatuses, an information processing apparatus is configured to: in order to obtain a transmitted reference signal x(k,n) transmitted from a transmission-side apparatus k (k=1, . . . , K) by the n-th reference signal transmission in the repetition, acquire a phase rotation amount φ(g,n) given to a transmitted reference signal x(k) and assigned to a group g to which the transmission-side apparatus k belongs and transmit the phase rotation amount φ(g,n) to the transmission-side apparatus k. The phase rotation amount φ(g,n) is acquired so that received reference signals from transmission-side apparatuses not belonging to the group g are cancelled when a phase rotation amount opposite to the phase rotation amount φ(g,n) is given to a received reference signal r(n), and the first to N-th received reference signals in the repetition are added.

## Claims

### Claim 1

An information processing apparatus comprising a controller configured to, when signals are simultaneously received from K transmission-side apparatuses (K: a positive integer) by a receiving antenna, and repetition of repeatedly and successively transmitting the same signal N times (N: a positive integer) is performed by the K transmission-side apparatuses:
acquire a received reference signal r(n) (n=1, . . . , N) that is received by the receiving antenna by the n-th reference signal transmission in the repetition, the received reference signal r(n) including a transmitted reference signal x(k,n) (k=1, . . . , K) from each of the K transmission-side apparatuses, the transmitted reference signal x(k,n) given a phase rotation amount φ(g,n) that is assigned to a group g (g=1, . . . , G) to which the transmission-side apparatus k belongs among G groups (G: a positive integer; 1<G≤K) made by dividing the K transmission-side apparatuses;
acquires, by giving a phase rotation amount opposite to the phase rotation amount φ(g,n) for the group g to the received reference signal r(n) and adding the first to N-th received reference signals in the repetition, a received reference signal r(g) (g=1, . . . , G) of the group g that includes received reference signals from one or more transmission-side apparatuses belonging to the group g; and
performs communication channel estimation based on the received reference signal r(g) (g=1, . . . , G).

### Claim 2 (depends on 1)

The information processing apparatus according to claim 1, wherein the phase rotation amount φ(g,n) is a value such that received reference signals from transmission-side apparatuses not belonging to the group g are cancelled when giving the phase rotation amount opposite to the phase rotation amount φ(g,n) to the received reference signal r(n) and adding the first to N-th received reference signals in the repetition.

### Claim 3 (depends on 2)

The information processing apparatus according to claim 2, wherein the phase rotation amount φ(g,n) is a value such that a phase sequence Φg1 and a phase sequence Φg2 are orthogonal to each other in all of combinations of two groups g1 and g2 (g1=1, . . . , G; g2=1, . . . , G; g1≠g2) among the G groups.

### Claim 4 (depends on 1)

The information processing apparatus according to claim 1, wherein
the controller
acquires a data signal d by adding data signals d(n) corresponding to the N times in the repetition, each of the data signals d(n) transmitted from the K transmission-side apparatuses by the n-th data signal transmission in the repetition, received by the receiving antenna, and including a data signal d(k,n) from the transmission-side apparatus k (k=1, . . . , K); and
separates a data signal d(k) received from the transmission-side apparatus k, from the data signal d using a result of the communication channel estimation.

### Claim 5 (depends on 1)

The information processing apparatus according to claim 1, wherein the controller simultaneously receives signals from the K transmission-side apparatuses by M receiving antennas (M: a positive integer), and, when each of the K transmission-side apparatuses performs the repetition, executes the communication channel estimation for each receiving antenna.

### Claim 6

A method executed by a computer comprising:
when signals are simultaneously received from K transmission-side apparatuses (K: a positive integer) by a receiving antenna, and repetition of repeatedly and successively transmitting the same signal N times (N: a positive integer) is performed by the K transmission-side apparatuses,
acquiring a received reference signal r(n) (n=1, . . . , N) that is received by the receiving antenna by the n-th reference signal transmission in the repetition, the received reference signal r(n) including a transmitted reference signal x(k,n) (k=1, . . . , K) from each of the K transmission-side apparatuses, the transmitted reference signal x(k,n) given a phase rotation amount φ(g,n) that is assigned to a group g (g=1, . . . , G) to which the transmission-side apparatus k belongs among G groups (G: a positive integer; 1<G≤K) made by dividing the K transmission-side apparatuses;
acquiring a phase rotation amount opposite to the phase rotation amount φ(g,n) for the group g to the received reference signal r(n) and adding the first to N-th received reference signals in the repetition, a received reference signal r(g) (g=1, . . . , G) of the group g that includes received reference signals from one or more transmission-side apparatuses belonging to the group g; and
performing communication channel estimation based on the received reference signal r(g) (g=1, . . . , G).

### Claim 7 (depends on 6)

The method according to claim 6, wherein the phase rotation amount φ(g,n) is a value such that received reference signals from transmission-side apparatuses not belonging to the group g are cancelled when giving the phase rotation amount opposite to the phase rotation amount φ(g,n) to the received reference signal r(n) and adding the first to N-th received reference signals in the repetition.

### Claim 8 (depends on 7)

The method according to claim 7, wherein the phase rotation amount φ(g,n) is a value such that a phase sequence Φg1 and a phase sequence Φg2 are orthogonal to each other in all of combinations of two groups g1 and g2 (g1=1, . . . , G; g2=1, . . . , G; g1+g2) among the G groups.

### Claim 9 (depends on 6)

The method according to claim 6, further comprising:
acquiring a data signal d by adding data signals d(n) corresponding to the N times in the repetition, each of the data signals d(n) transmitted from the K transmission-side apparatuses by the n-th data signal transmission in the repetition, received by the receiving antenna, and including a data signal d(k,n) from the transmission-side apparatus k (k=1, . . . , K), and
separating a data signal d(k) received from the transmission-side apparatus k, from the data signal d using a result of the communication channel estimation.

### Claim 10 (depends on 6)

The method according to claim 6, wherein the computer simultaneously receives signals from the K transmission-side apparatuses by M receiving antennas (M: a positive integer), and, when each of the K transmission-side apparatuses performs the repetition, executes the communication channel estimation for each receiving antenna.