Patent ID: 7558537

Claim:
A transmitter, comprising: a baseband processor operable to generate one or more outgoing digital signal streams for transmission over one or more antennas substantially at the same time according to a selected transmission mode of operation; wherein the baseband processor defines logic for generating a preamble for each outgoing digital signals stream according to whether a high data rate or mixed mode transmission format is to be used for the outgoing digital signal streams; wherein, for a high data rate transmission preamble format, the preamble format comprises: a 24 microseconds period if only one stream is to be transmitted; and a 24 microsecond periods plus 4 microseconds for each additional stream that is to be transmitted; and wherein, for a mixed mode transmission format, the preamble format comprises: a 36 microsecond period if only one stream is to be transmitted; and a 36 microsecond period plus 4 microseconds for each additional stream that is to be transmitted.