WIRELESS COMMUNICATIONS METHOD FOR TRANSMITTING PRE-CODED STREAM OUTPUTS THAT ARE GENERATED FROM APPLYING PRE-CODING TO STREAM INPUTS WITH DIFFERENT PACKET FORMATS AND ASSOCIATED WIRELESS COMMUNICATIONS APPARATUS

• US 20200136687A1
• Filed: 09/25/2019
• Published: 04/30/2020
• Est. Priority Date: 10/31/2018
• Status: Active Grant

• Current Assignee: MediaTek, Inc.
• Original Assignee: MediaTek, Inc.
• Inventors: Liu, Hsuan-Yu, Hsieh, Hung-Tao, Yang, Tung-Sheng, Lin, Pu-Hsuan, Chiu, Wen-Hsien
• Granted Patent: US 11,265,049 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A wireless communications method includes: obtaining a plurality of stream inputs, wherein the stream inputs include a first stream input complying with a first packet format and a second stream input complying with a second packet format, and the second packet format is different from the first packet format; applying pre-coding to the stream inputs to generate a plurality of pre-coded stream outputs, respectively; and performing wireless transmission upon the pre-coded stream outputs, wherein downlink Multi-User Multiple-Input Multiple-Output (MU-MIMO) transmission is involved in the wireless transmission of the pre-coded stream outputs.

Claims

1. A wireless communications method comprising:

obtaining a plurality of stream inputs, wherein the stream inputs comprise a first stream input complying with a first packet format and a second stream input complying with a second packet format, and the second packet format is different from the first packet format;

applying pre-coding to the stream inputs to generate a plurality of pre-coded stream outputs, respectively; and

performing wireless transmission upon the pre-coded stream outputs, wherein downlink Multi-User Multiple-Input Multiple-Output (MU-MIMO) transmission is involved in said wireless transmission of the pre-coded stream outputs.

2. The wireless communications method of claim 1, wherein the pre-coded stream outputs comprise a first pre-coded stream output that is derived from said pre-coding of the first stream input, and downlink Orthogonal Frequency Division Multiple Access (OFDMA) is further involved in said wireless transmission of the first pre-coded stream output.

3. The wireless communications method of claim 2, wherein the pre-coded stream outputs further comprise a second pre-coded stream output that is derived from said pre-coding of the second stream input, and downlink OFDMA is not involved in said wireless transmission of the second pre-coded stream output.

4. The wireless communications method of claim 1, wherein the first packet format complies with a first wireless communications standard, the second packet format complies with a second wireless communications standard, and the first wireless communications standard is different from the second wireless communications standard.

5. The wireless communications method of claim 4, wherein each of the first wireless communications standard and the second wireless communications standard is a Wireless Local Area Network (WLAN) standard.

6. The wireless communications method of claim 5, wherein the first wireless communications standard is an Institute of Electrical and Electronics Engineers (IEEE) 802.11ac standard, and the second wireless communications standard is an IEEE 802.11ax standard.

7. The wireless communications method of claim 1, wherein the first stream input comprises a packet that has a preamble section followed by a payload section, and said pre-coding of the packet starts from a start point of the preamble section.

8. The wireless communications method of claim 1, wherein the first stream input comprises a packet that has a preamble section followed by a payload section, and said pre-coding of the packet starts from a Legacy Short Training Field (L-STF) included in the preamble section.

9. The wireless communications method of claim 1, wherein the first stream input comprises a packet that has a preamble section followed by a payload section, and said pre-coding of the packet starts from a specific point of the preamble section, where the specific point is between a start point of the preamble section and an end point of the preamble section.

10. The wireless communications method of claim 1, wherein the first stream input comprises a packet that has a preamble section followed by a payload section, and said pre-coding of the packet starts from a Legacy Long Training Field (L-LTF) included in the preamble section.

11. A wireless communications apparatus comprising:

a digital baseband circuit, arranged to;

obtain a plurality of stream inputs, wherein the stream inputs comprise a first stream input complying with a first packet format and a second stream input complying with a second packet format, and the second packet format is different from the first packet format; and

apply pre-coding to the stream inputs to generate a plurality of pre-coded stream outputs, respectively; and

a transmit (TX) circuit, arranged to perform wireless transmission upon the pre-coded stream outputs, wherein downlink Multi-User Multiple-Input Multiple-Output (MU-MIMO) transmission is involved in said wireless transmission of the pre-coded stream outputs.

12. The wireless communications apparatus of claim 11, wherein the pre-coded stream outputs comprise a first pre-coded stream output that is derived from said pre-coding of the first stream input, and downlink Orthogonal Frequency Division Multiple Access (OFDMA) is further involved in said wireless transmission of the first pre-coded stream output.

13. The wireless communications apparatus of claim 12, wherein the pre-coded stream outputs further comprise a second pre-coded stream output that is derived from said pre-coding of the second stream input, and downlink OFDMA is not involved in said wireless transmission of the second pre-coded stream output.

14. The wireless communications apparatus of claim 11, wherein the first packet format complies with a first wireless communications standard, the second packet format complies with a second wireless communications standard, and the first wireless communications standard is different from the second wireless communications standard.

15. The wireless communications apparatus of claim 14, wherein each of the first wireless communications standard and the second wireless communications standard is a Wireless Local Area Network (WLAN) standard.

16. The wireless communications apparatus of claim 15, wherein the first wireless communications standard is an Institute of Electrical and Electronics Engineers (IEEE) 802.11ac standard, and the second wireless communications standard is an IEEE 802.11ax standard.

17. The wireless communications apparatus of claim 11, wherein the first stream input comprises a packet that has a preamble section followed by a payload section, and said pre-coding of the packet starts from a start point of the preamble section.

18. The wireless communications apparatus of claim 11, wherein the first stream input comprises a packet that has a preamble section followed by a payload section, and said pre-coding of the packet starts from a Legacy Short Training Field (L-STF) included in the preamble section.

19. The wireless communications apparatus of claim 11, wherein the first stream input comprises a packet that has a preamble section followed by a payload section, and said pre-coding of the packet starts from a specific point of the preamble section, where the specific point is between a start point of the preamble section and an end point of the preamble section.

20. The wireless communications apparatus of claim 11, wherein the first stream input comprises a packet that has a preamble section followed by a payload section, and said pre-coding of the packet starts from a Legacy Long Training Field (L-LTF) included in the preamble section.