| 摘要 |
PROBLEM TO BE SOLVED: To provide a system which is for a legacy device compatible with the IEEE802.11a specification and the 802.11g specification for a wireless LAN (WLAN) and prevents "stomping" of MIMO packets by starting transmission of a subsequent MIMO packet before completing a preceding MIMO packet.SOLUTION: A time-division training pattern for MIMO packets is provided. In this pattern, a first antenna can transmit a short symbol, a first long symbol, and then a SIGNAL symbol in this order. A second antenna can transmit a second long symbol after the transmission of the legacy SIGNAL symbol. The first and second antennas can transmit SIGNAL symbols (associated with MIMO data) substantially simultaneously after transmission of the second long symbol. The invention allows a legacy device to decode the length of a MIMO packet and refrain from the transmission during the period of the MIMO packet. |
