US 12,224,791 B2
Information processing apparatus, transmission-side apparatus and method
Kenichi Takizawa, Koganei (JP); and Masafumi Moriyama, Koganei (JP)
Assigned to TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed by TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota (JP)
Filed on Sep. 21, 2023, as Appl. No. 18/471,707.
Application 18/471,707 is a continuation of application No. 17/933,585, filed on Sep. 20, 2022, granted, now 11,799,512.
Claims priority of application No. 2021-161154 (JP), filed on Sep. 30, 2021.
Prior Publication US 2024/0014848 A1, Jan. 11, 2024
Int. Cl. H04B 1/62 (2006.01); H04B 1/10 (2006.01)
CPC H04B 1/62 (2013.01) [H04B 1/1027 (2013.01); H04B 2001/1045 (2013.01)] 10 Claims
OG exemplary drawing
 
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).