Long training field sequence transmission method and communication apparatus

A communication apparatus, comprising:

• a processing module, wherein the processing module is configured to determine a first long training field (LTF) sequence, and the first LTF sequence is a sequence segment that is in a total LTF sequence corresponding to a channel bandwidth and that corresponds to a first resource unit (RU), N subcarriers in the channel bandwidth are in a one-to-one correspondence with N components of the total LTF sequence, the first RU is M consecutive first subcarriers in the N subcarriers, the first LTF sequence is M components in the N components, and there is a correspondence between the M consecutive first subcarriers and the M components;
• and
• a communication module, wherein the communication module is configured to send the first LTF sequence to an access point AP on a discrete RU, wherein the discrete RU comprises M inconsecutive second subcarriers, and the M components of the first LTF sequence are respectively sent on the M inconsecutive second subcarriers.

A long training field sequence transmission apparatus, comprising:

• a communication module, wherein the communication module is configured to receive a signal from a STA on a discrete RU;
• and
• a processing module, wherein the processing module is configured to perform channel estimation on the signal received on the discrete RU based on a first LTF sequence, wherein the first LTF sequence is a sequence segment that is in a sequence corresponding to a total channel bandwidth and that corresponds to a first resource unit RU, N subcarriers in the total channel bandwidth are in a one-to-one correspondence with N components, the first RU is M consecutive first subcarriers in the N subcarriers, the first LTF sequence is M components in the N components, there is a correspondence between the M consecutive first subcarriers and the M components, the discrete RU comprises M inconsecutive second subcarriers, and the M components of the first LTF sequence are respectively used to perform channel estimation on received signals on the M second subcarriers.