Communication method in wireless local area network and related apparatuses
A communication method and related apparatuses are disclosed. The method includes: A communication apparatus generates and sends a first frequency domain signal, where the first frequency domain signal includes a subsignal obtained by mapping N pieces of first frequency domain data to a first group of subcarriers and a subsignal obtained by mapping N pieces of second frequency domain data to a second group of subcarriers, and a spacing between the first group of subcarriers and the second group of subcarriers is odd-numbered subcarriers. The N pieces of first frequency domain data are obtained by multiplying data at even positions or data at odd positions in N pieces of original frequency domain data by i or −i, and the N pieces of second frequency domain data are obtained by performing reverse arrangement and/or negation on the N pieces of first frequency domain data.
1 . A communication method in a wireless local area network, comprising:
receiving, by a communication apparatus, a second frequency domain signal, wherein the second frequency domain signal is obtained after a first frequency domain signal is transmitted through a radio channel, the first frequency domain signal comprises a subsignal obtained by mapping N pieces of first frequency domain data to a first group of subcarriers and a subsignal obtained by mapping N pieces of second frequency domain data to a second group of subcarriers, a spacing between the first group of subcarriers and the second group of subcarriers is odd-numbered subcarriers, the first group of subcarriers and the second group of subcarriers each comprise N evenly spaced subcarriers, subcarriers comprised in the first group of subcarriers do not overlap subcarriers comprised in the second group of subcarriers, and N is an integer greater than 1; and
the N pieces of first frequency domain data are obtained by performing phase rotation on data at even positions or data at odd positions in N pieces of original frequency domain data, and the N pieces of second frequency domain data are obtained by performing a preset operation on the N pieces of first frequency domain data, the present operation comprising at least one of revers arrangement, negation or conjugation; and
performing, by the communication apparatus, preset processing on the second frequency domain signal, to obtain the N pieces of original frequency domain data, the preset processing comprising performing an inverse operation of the preset operation.
2 . The method according to claim 1 , wherein the performing, by the communication apparatus, preset processing on the second frequency domain signal, to obtain the N pieces of original frequency domain data comprises:
performing, by the communication apparatus, reverse phase rotation on data on subcarriers at even positions or data on subcarriers at odd positions in the first group of subcarriers, to obtain the N pieces of original frequency domain data.
3 . The method according to claim 1 , wherein the performing, by the communication apparatus, preset processing on the second frequency domain signal, to obtain the N pieces of original frequency domain data comprises:
performing, by the communication apparatus, an inverse operation of the preset operation on data on the second group of subcarriers, to obtain the N pieces of first frequency domain data; and
performing, by the communication apparatus, reverse phase rotation on data at even positions or data at odd positions in the N pieces of first frequency domain data, to obtain the N pieces of original frequency domain data.
4 . The method according to claim 1 , wherein the performing, by the communication apparatus, preset processing on the second frequency domain signal, to obtain the N pieces of original frequency domain data comprises:
performing, by the communication apparatus, reverse phase rotation on data on subcarriers at even positions or data on subcarriers at odd positions in the first group of subcarriers, to obtain N pieces of first original frequency domain data;
performing, by the communication apparatus, reverse phase rotation on data on subcarriers at even positions or data on subcarriers at odd positions in the second group of subcarriers, and then performing an inverse operation of the preset operation, to obtain N pieces of second original frequency domain data; and
processing, by the communication apparatus, the N pieces of first original frequency domain data and the N pieces of second original frequency domain data according to a maximum ratio combining algorithm, to obtain the N piece of original frequency domain data.
5 . The method according to claim 1 , wherein an angle of the phase rotation is 90°, −90°, or 180°; and
the preset operation comprises reverse arrangement and/or negation.
6 . The method according to claim 3 , wherein an angle of the reverse phase rotation is −90°, 90°, or 180°; and
the inverse operation of the preset operation comprises reverse arrangement and/or negation.
7 . The method according to claim 1 , wherein N is a quantity of subcarriers carried in a frequency band of a preset size; and
the N subcarriers comprise: a data subcarrier, a pilot subcarrier, and/or a null subcarrier.
8 . The method according to claim 1 , wherein the N pieces of original frequency domain data comprise:
data obtained by performing constellation mapping on one or more pieces of original data, one or more of ±1, and/or one or more of 0.
9 . The method according to claim 1 , wherein the N pieces of first frequency domain data are [X(0), X(1), X(2), . . . , X(N−1)], the N pieces of second frequency domain data are [Y(0), Y(1), Y(2), . . . , Y(N−1)], wherein X( ) represents the first frequency domain data, and Y( ) represents the second frequency domain data; and
Y(k)=−X(N−k−1) or Y(k)=X(N−k−1), and 0≤k≤N−1.
10 . A communication apparatus, comprising at least one processor and a transceiver, wherein
the transceiver is configured to receive a second frequency domain signal, wherein the second frequency domain signal is obtained after a first frequency domain signal is transmitted through a radio channel, the first frequency domain signal comprises a subsignal obtained by mapping N pieces of first frequency domain data to a first group of subcarriers and a subsignal obtained by mapping N pieces of second frequency domain data to a second group of subcarriers, a spacing between the first group of subcarriers and the second group of subcarriers is odd-numbered subcarriers, the first group of subcarriers and the second group of subcarriers each comprise N evenly spaced subcarriers, subcarriers comprised in the first group of subcarriers do not overlap subcarriers comprised in the second group of subcarriers, and N is an integer greater than 1; and the N pieces of first frequency domain data are obtained by performing phase rotation on data at even positions or data at odd positions in N pieces of original frequency domain data, and the N pieces of second frequency domain data are obtained by performing a preset operation on the N pieces of first frequency domain data, the preset operation comprising at least one of reverse arrangement, negation or conjugation; and
the at least one processor is configured to perform preset processing on the second frequency domain signal, to obtain the N pieces of original frequency domain data, the preset processing comprising performing an inverse operation of the preset operation.
11 . The apparatus according to claim 10 , wherein the at least one processor is configured to perform reverse phase rotation on data on subcarriers at even positions or data on subcarriers at odd positions in the first group of subcarriers, to obtain the N pieces of original frequency domain data.
12 . The apparatus according to claim 10 , wherein the at least one processor is configured to perform an inverse operation of the preset operation on data on the second group of subcarriers, to obtain the N pieces of first frequency domain data; and perform reverse phase rotation on data at even positions or data at odd positions in the N pieces of first frequency domain data, to obtain the N pieces of original frequency domain data.
13 . The apparatus according to claim 10 , wherein the at least one processor is configured to:
perform reverse phase rotation on data on subcarriers at even positions or data on subcarriers at odd positions in the first group of subcarriers, to obtain N pieces of first original frequency domain data;
perform reverse phase rotation on data on subcarriers at even positions or data on subcarriers at odd positions in the second group of subcarriers, and then perform an inverse operation of the preset operation, to obtain N pieces of second original frequency domain data; and
process the N pieces of first original frequency domain data and the N pieces of second original frequency domain data according to a maximum ratio combining algorithm, to obtain the N piece of original frequency domain data.
14 . The apparatus according to claim 10 , wherein an angle of the phase rotation is 90°, −90°, or 180°; and
the preset operation comprises reverse arrangement and/or negation.
15 . The apparatus according to claim 12 , wherein an angle of the reverse phase rotation is −90°, 90°, or 180°; and
the inverse operation of the preset operation comprises reverse arrangement and/or negation.
16 . The apparatus according to claim 10 , wherein N is a quantity of subcarriers carried in a frequency band of a preset size; and
the N subcarriers comprise one or more of the following subcarriers: a data subcarrier, a pilot subcarrier, and a null subcarrier.
17 . The apparatus according to claim 10 , wherein the N pieces of original frequency domain data comprise:
data obtained by performing constellation mapping on one or more pieces of original data, one or more ±1, and/or one or more 0.
18 . The apparatus according to claim 10 , wherein the N pieces of first frequency domain data are [X(0), X(1), X(2), . . . , X(N−1)], the N pieces of second frequency domain data are [Y(0), Y(1), Y(2), . . . , Y(N−1)], wherein XO represents the first frequency domain data, and Y) represents the second frequency domain data; and
Y(k)=−X(N−k−1) or Y(k)=X(N−k−1), and 0≤k≤N−1.
19 . A non-transitory, computer-readable storage medium, wherein the computer-readable storage medium stores program instructions that, when executed by a computer, enable the computer to:
receive a second frequency domain signal, wherein
the second frequency domain signal is obtained after a first frequency domain signal is transmitted through a radio channel, the first frequency domain signal comprises a subsignal obtained by mapping N pieces of first frequency domain data to a first group of subcarriers and a subsignal obtained by mapping N pieces of second frequency domain data to a second group of subcarriers, a spacing between the first group of subcarriers and the second group of subcarriers is odd-numbered subcarriers, the first group of subcarriers and the second group of subcarriers each comprise N evenly spaced subcarriers, subcarriers comprised in the first group of subcarriers do not overlap subcarriers comprised in the second group of subcarriers, and N is an integer greater than 1; and
the N pieces of first frequency domain data are obtained by performing phase rotation on data at even positions or data at odd positions in N pieces of original frequency domain data, and the N pieces of second frequency domain data are obtained by performing a preset operation on the N pieces of first frequency domain data, the preset operation comprising at least one of reverse arrangement, negation or conjugation; and
perform preset processing on the second frequency domain signal, to obtain the N pieces of original frequency domain data, the preset processing comprising performing an inverse operation of the preset operation.