Generation, configuration and transmission of a chirplike signal
This patent application discloses methods, apparatus, and systems that relate generating, configuring, and transmitting a chirplike signal in communication systems. In one example aspect, a method for wireless communication includes transmitting, by a first wireless device, a sensing signal with frequency as a continuous function of time over a period of time in a range of [−B/2, B/2], wherein B is a transmission bandwidth of the sensing signal.
1 . A method for wireless communication, comprising:
transmitting, by a first wireless device, a sensing signal with a frequency that is a continuous function of time over a period of time in a range of [−B/2, B/2], wherein B is a transmission bandwidth of the sensing signal,
wherein the frequency is linearly and continuously swept in the range of [−B/2, B/2].
2 . The method of claim 1 , wherein the sensing signal is generated by at least one of:
(1) a time shift operation;
(2) a frequency shift operation;
(3) a mapping operation of a linear frequency modulation (LFM) signal; or
(4) a mapping method related to a Zadoff-Chu sequence.
3 . The method of claim 1 , wherein the sensing signal is generated by setting values of u and C v of a Zadoff-Chu (ZC) sequence, wherein u=1 or −1, wherein C v =−M/2, −(M+1)/2, or −(M−1)/2, the ZC sequence represented by:
x
u
,
v
(
n
)
=
x
u
(
(
n
+
C
v
)
mod
M
)
,
and
x
u
(
m
)
=
e
-
j
π
u
m
(
m
+
1
)
M
,
m
=
0
,
1
,
…
,
M
-
1
.
4 . The method of claim 1 , wherein the sensing signal is generated using at least one of:
s
(
m
)
=
exp
(
j
π
(
m
-
M
/
2
)
2
M
)
,
m
=
0
,
1
,
2
,
…
,
M
-
1
;
(
1
)
s
(
m
)
=
exp
(
j
π
m
2
M
-
j
π
m
)
,
m
=
0
,
1
,
2
,
…
,
M
-
1
;
(
2
)
s
(
m
)
=
exp
(
-
j
π
(
m
-
M
/
2
)
2
M
)
,
m
=
0
,
1
,
2
,
…
,
M
-
1
;
or
(
3
)
s
(
m
)
=
exp
(
-
j
π
m
2
M
+
j
π
m
)
,
m
=
0
,
1
,
2
,
…
,
M
-
1
.
(
4
)
5 . The method of claim 1 , wherein at least a part of the sensing signal is used as a reference signal or a synchronization signal.
6 . A method for wireless communication, comprising:
receiving, by a second wireless device, a sensing signal with a frequency that is a continuous function of time over a period of time in a range of [−B/2, B/2], wherein B is a transmission bandwidth of the sensing signal,
wherein the frequency is linearly and continuously swept in the range of [−B/2, B/2]; and
conducting an operation based on the sensing signal.
7 . The method of claim 6 , wherein the sensing signal is generated by at least one of:
(1) a time shift operation,
(2) a frequency shift operation,
(3) a mapping operation of a linear frequency modulation (LFM) signal, or
(4) a mapping method related to a Zadoff-Chu sequence.
8 . The method of claim 6 , wherein the sensing signal is generated by setting values of u and C v of a Zadoff-Chu (ZC) sequence, wherein u=1 or −1, wherein C v =−M/2, −(M+1)/2, or −(M−1)/2, the ZC sequence represented by:
x
u
,
v
(
n
)
=
x
u
(
(
n
+
C
v
)
mod
M
)
,
and
x
u
(
m
)
=
e
-
j
π
u
m
(
m
+
1
)
M
,
m
=
0
,
1
,
…
,
M
-
1
.
9 . The method of claim 6 , wherein the sensing signal is generated using at least one of:
s
(
m
)
=
exp
(
j
π
(
m
-
M
/
2
)
2
M
)
,
m
=
0
,
1
,
2
,
…
,
M
-
1
;
(
1
)
s
(
m
)
=
exp
(
j
π
m
2
M
-
j
π
m
)
,
m
=
0
,
1
,
2
,
…
,
M
-
1
;
(
2
)
s
(
m
)
=
exp
(
-
j
π
(
m
-
M
/
2
)
2
M
)
,
m
=
0
,
1
,
2
,
…
,
M
-
1
;
or
(
3
)
s
(
m
)
=
exp
(
-
j
π
m
2
M
+
j
π
m
)
,
m
=
0
,
1
,
2
,
…
,
M
-
1
.
(
4
)
10 . The method of claim 6 , wherein at least a part of the sensing signal is used as a reference signal or a synchronization signal.
11 . An apparatus for wireless communication comprising at least one processor and a memory storing instructions, execution of which by the at least one processor causes the apparatus to:
transmit a sensing signal with a frequency that is a continuous function of time over a period of time in a range of [−B/2, B/2], wherein B is a transmission bandwidth of the sensing signal,
wherein the frequency is linearly and continuously swept in the range of [−B/2, B/2].
12 . The apparatus of claim 11 , wherein the sensing signal is generated by at least one of:
(1) a time shift operation,
(2) a frequency shift operation,
(3) a mapping operation of a linear frequency modulation (LFM) signal, or
(4) a mapping method related to a Zadoff-Chu sequence.
13 . The apparatus of claim 11 , wherein the sensing signal is generated by setting values of u and C v of a Zadoff-Chu (ZC) sequence, wherein u=1 or −1, wherein C v =−M/2, −(M+1)/2, or −(M−1)/2, the ZC sequence represented by:
x
u
,
v
(
n
)
=
x
u
(
(
n
+
C
v
)
mod
M
)
,
and
x
u
(
m
)
=
e
-
j
π
u
m
(
m
+
1
)
M
,
m
=
0
,
1
,
…
,
M
-
1
.
14 . The apparatus of claim 11 , wherein the sensing signal is generated using at least one of:
s
(
m
)
=
exp
(
j
π
(
m
-
M
/
2
)
2
M
)
,
m
=
0
,
1
,
2
,
…
,
M
-
1
;
(
1
)
s
(
m
)
=
exp
(
j
π
m
2
M
-
j
π
m
)
,
m
=
0
,
1
,
2
,
…
,
M
-
1
;
(
2
)
s
(
m
)
=
exp
(
-
j
π
(
m
-
M
/
2
)
2
M
)
,
m
=
0
,
1
,
2
,
…
,
M
-
1
;
or
(
3
)
s
(
m
)
=
exp
(
-
j
π
m
2
M
+
j
π
m
)
,
m
=
0
,
1
,
2
,
…
,
M
-
1
.
(
4
)
15 . The apparatus of claim 11 , wherein at least a part of the sensing signal is used as a reference signal or a synchronization signal.
16 . An apparatus for wireless communication comprising at least one processor and a memory storing instructions, execution of which by the at least one processor causes the apparatus to:
receive a sensing signal with a frequency that is a continuous function of time over a period of time in a range of [−B/2, B/2], wherein B is a transmission bandwidth of the sensing signal,
wherein the frequency is linearly and continuously swept in the range of [−B/2, B/2]; and
conducting an operation based on the sensing signal.
17 . The apparatus of claim 16 , wherein the sensing signal is generated by at least one of:
(1) a time shift operation,
(2) a frequency shift operation,
(3) a mapping operation of a linear frequency modulation (LFM) signal, or
(4) a mapping method related to a Zadoff-Chu sequence.
18 . The apparatus of claim 16 , wherein the sensing signal is generated by setting values of u and C v of a Zadoff-Chu (ZC) sequence, wherein u=1 or −1, wherein C v =−M/2, −(M+1)/2, or −(M−1)/2, the ZC sequence represented by:
x
u
,
v
(
n
)
=
x
u
(
(
n
+
C
v
)
mod
M
)
,
and
x
u
(
m
)
=
e
-
j
π
u
m
(
m
+
1
)
M
,
m
=
0
,
1
,
…
,
M
-
1
.
19 . The apparatus of claim 16 , wherein the sensing signal is generated using at least one of:
s
(
m
)
=
exp
(
j
π
(
m
-
M
/
2
)
2
M
)
,
m
=
0
,
1
,
2
,
…
,
M
-
1
;
(
1
)
s
(
m
)
=
exp
(
j
π
m
2
M
-
j
π
m
)
,
m
=
0
,
1
,
2
,
…
,
M
-
1
;
(
2
)
s
(
m
)
=
exp
(
-
j
π
(
m
-
M
/
2
)
2
M
)
,
m
=
0
,
1
,
2
,
…
,
M
-
1
;
or
(
3
)
s
(
m
)
=
exp
(
-
j
π
m
2
M
+
j
π
m
)
,
m
=
0
,
1
,
2
,
…
,
M
-
1
.
(
4
)
20 . The apparatus of claim 16 , wherein at least a part of the sensing signal is used as a reference signal or a synchronization signal.