Patent ID: 7450489
Filing Date: 2008-11-11
Classification: H04L

Abstract:
1. A method for transmitting a packet comprising: transmitting an orthogonal frequency division multiplexed packet preamble including a long packet preamble and a signal header field readable by both high-throughput communication stations and standard-throughput communication stations, and transmitting an additional training field readable by the high-throughput communication stations; transmitting training tones over a plurality of spatial channels during the long packet preamble, the training tones being interspersed among subcarrier frequencies of the spatial channels; and retransmitting the training tones during the additional training field, the training tones being shifted among the subcarrier frequencies of the spatial channels during retransmission, wherein the signal header field includes packet rate and length information, the signal header field being readable at least by the standard throughput communication stations and causing the standard throughput communication stations to refrain from transmitting during a length of the packet.