A method of transmitting demodulation reference signals (DMRS) over one, three or five resource blocks (RBs) with Interleaved Frequency Division Multiple Access (IFDMA) from a wireless device to a wireless network node in a wireless network wherein Single Carrier Frequency Division Multiple Access (SC-OFDMA) is deployed in uplink, is provided. At least one of: a set of base sequences including thirty quadrature phase shifting keying, QPSK, sequences of length 6, 18 or 30 is determined, a demodulation reference signal sequence is derived from the determined set of base sequences, the demodulation reference signal sequence is multiplexed, and the multiplexed demodulation reference signal sequence is transmitted, by the wireless device, to the wireless network node.

This application provides information sending and receiving methods and apparatuses. This application provides a new PPDU format. In some instances, a long training sequence in the new PPDU format is orthogonal to a legacy long training sequence or orthogonal to a high throughput long training sequence. By using this long training sequence, a format of a PPDU can be automatically detected, so as to further process the PPDU according to a network standard corresponding to the format of the PPDU. In addition, when a target long training field is read, the format of the PPDU can be detected, thereby, in at least some implementations, saving time for detecting the format of the PPDU, improving efficiency of detecting the format of the PPDU, and completing a task of detecting the format of the PPDU as early as possible.

A communication apparatus transmits or receives an Extremely High Throughput (EHT) single-user (SU) physical-layer protocol data unit (PPDU), an EHT extended range (ER) SU PPDU, or an EHT multi-user (MU) PPDU. The transmitted or received EHT PPDU includes an EHT signal field (EHT-SIG) which includes a field indicating information regarding semi-orthogonal multiple access (SOMA).

A communication apparatus transmits or receives an Extremely High Throughput (EHT) single-user (SU) physical-layer protocol data unit (PPDU), an EHT extended range (ER) SU PPDU, or an EHT multi-user (MU) PPDU. The transmitted or received EHT PPDU includes an EHT signal field (EHT-SIG) which includes a field indicating information regarding semi-orthogonal multiple access (SOMA).

A midamble indication method includes sending, by a first device, midamble indication information to a second device. A duration of a midamble indicated by the midamble indication information is greater than or equal to a threshold. The threshold is related to a processing capability of the second device. In a midamble receiving method, the second device receives the midamble according to the indication information.

A midamble indication method includes sending, by a first device, midamble indication information to a second device. A duration of a midamble indicated by the midamble indication information is greater than or equal to a threshold. The threshold is related to a processing capability of the second device. In a midamble receiving method, the second device receives the midamble according to the indication information.

This application discloses midamble indication and receiving methods and apparatuses. In the method, a first device sends midamble indication information to a second device, where a duration of a midamble indicated by the midamble indication information is greater than or equal to a threshold, and the threshold is related to a processing capability of the second device; and the second device receives the midamble according to the indication information.

A method of transmitting demodulation reference signals (DMRS) over one, three or five resource blocks (RBs) with Interleaved Frequency Division Multiple Access (IFDMA) from a wireless device to a wireless network node in a wireless network wherein Single Carrier Frequency Division Multiple Access (SC-OFDMA) is deployed in uplink, is provided. At least one of: a set of base sequences including thirty quadrature phase shifting keying, QPSK, sequences of length 6, 18 or 30 is determined, a demodulation reference signal sequence is derived from the determined set of base sequences, the demodulation reference signal sequence is multiplexed, and the multiplexed demodulation reference signal sequence is transmitted, by the wireless device, to the wireless network node.

A method of transmitting demodulation reference signals (DMRS) over one, three or five resource blocks (RBs) with Interleaved Frequency Division Multiple Access (IFDMA) from a wireless device to a wireless network node in a wireless network wherein Single Carrier Frequency Division Multiple Access (SC-OFDMA) is deployed in uplink, is provided. At least one of: a set of base sequences including thirty quadrature phase shifting keying, QPSK, sequences of length 6, 18 or 30 is determined, a demodulation reference signal sequence is derived from the determined set of base sequences, the demodulation reference signal sequence is multiplexed, and the multiplexed demodulation reference signal sequence is transmitted, by the wireless device, to the wireless network node.

A communication apparatus transmits or receives an Extremely High Throughput (EHT) single-user (SU) physical-layer protocol data unit (PPDU), an EHT extended range (ER) SU PPDU, or an EHT multi-user (MU) PPDU. The transmitted or received EHT PPDU includes an EHT signal field (EHT-SIG) which includes a field indicating information regarding semi-orthogonal multiple access (SOMA).