Transmitting and receiving systems for increasing service...

Details Transmitting and receiving systems for increasing service... Transmitting and receiving systems for increasing service...

2006-12-08

2010-11-23

Ngo, Ricky (Department: 2464)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Plural diverse modulation techniques

C370S208000, C370S210000

Reexamination Certificate

active

07839760

ABSTRACT:
The present invention relates to an orthogonal frequency division multiplexing wireless local area network (LAN) transmitting/receiving system for providing expanded service coverage, and a method thereof. A first OFDM modulation is performed for an even-numbered time, and a second OFDM modulation is performed for an odd-numbered time. A transmitting frame including a plurality of signal fields according to the first and second OFDM modulation is transmitted. The receiving system determines whether a signal field is repeatedly generated in the frame. If the signal field is not repeatedly generated, corresponding demodulation is performed. If repeatedly performed, the signal field is demodulated by using first bit allocation information and second bit allocation information having a ½ value of the first bit allocation information. A data field is demodulated according to the demodulated signal field.

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