Method and system of implementation for ultrahigh speed MIMO OFDM wireless local area network

Abstract

The invention discloses an implementation method and a system for a super-high speed multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) wireless LAN, and belongs to the wireless communication technical field. By the implementation method and in the system, a transmitting site can simultaneously transmit one or a plurality of independent data sub-streams through a transmitting antenna set and can adopt different signal modulation modes for the OFDM sub-channels of the independent data sub-steams. In a certain space-time coding mode and error correcting code mode, the signal modulation modes adopted for the OFDM sub-channels are decided by the receiving site according to the signal-to-noise ratios before the modulation at the sub-channels, before the independent data sub-steams are space-time coded. The information about the signal modulation modes of the independent sub-streams at the OFDM sub-channels (sub-channel-modulation mode information) is transmitted from the receiving site to the transmitting site in a request-response manner or an active transmission manner.

Description

technical field [0001] The invention belongs to the technical field of wireless communication, in particular to a multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) wireless local area network system. Background technique [0002] With the increasing demand for information in social life, the network has increasingly become an indispensable part of people's daily life. Wireless local area network has broad development prospects because of its advantages such as flexible access and no need for wiring. [0003] The IEEE802.11 working group has proposed its wireless local area network solution to the application requirements of the wireless local area network, which is the 802.11 wireless local area network standard. So far, there are four main standards for the physical layer of 802.11 wireless LANs, namely 802.11, 802.11b, 802.11g and 802.11a, and the standards for the media access (MAC) layer mainly include 802.11 and 802.11e. In terms ...

AI Technical Summary

Problems solved by technology

In this way, if the same modulation method is used on each OFDM sub-channel of an independent data sub-stream, there will be such a problem: in those sub-channels with high channel gain, the excessive gain will be wasted; Sub-channels with low gain, especially in sub-channels with low channel gain due to deep fading, will bring serious bit errors to the transmitted sequence

The deep fading in the frequency selective channel makes the 802.11nMIMO-OFDM system not suitable for high-order modulation and high code rate to transmit data, so its physical layer is difficult to achieve its nominal maximum data rate in practical applications

Images