Low-rate long-range mode for OFDM wireless LAN

Details Low-rate long-range mode for OFDM wireless LAN Low-rate long-range mode for OFDM wireless LAN

2005-11-03

2010-06-08

Ghayour, Mohammad H (Department: 2611)

Pulse or digital communications

Spread spectrum

Direct sequence

C375S130000, C375S131000, C375S135000, C375S136000, C375S219000, C375S260000, C375S295000, C375S316000

Reexamination Certificate

active

07733939

ABSTRACT:
A system for implementing an orthogonal frequency division multiplexing scheme and providing an improved range extension. The system includes a transmitter for transmitting data to a receiver. The transmitter includes a symbol mapper for generating a symbol for each of a plurality of subcarriers and a spreading module for spreading out the symbol on each of the plurality of subcarriers by using a direct sequence spread spectrum. The symbol on each of the plurality of subcarriers is spread by multiplying the symbol by predefined length sequences. The receiver includes a de-spreader module for de-spreading the symbols on each of the plurality of subcarriers. The de-spreader module includes a simply correlator receiver for obtaining maximum detection. The correlator produces an output sequence of a same length as an input sequence and the de-spreader module uses a point of maximum correlation on the output sequence to obtain a recovered symbol.

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