Clock recovery for a wireless local area network station

Details Clock recovery for a wireless local area network station Clock recovery for a wireless local area network station

1990-12-24

1992-07-07

Swann, Tod

Pulse or digital communications

Repeaters

Testing

380 34, 380 48, 375107, H04K 100

Patent

active

051289601

ABSTRACT:
A local area network station for receiving data symbols encoded in a spread spectrum code and transmitted over a wireless channel includes in-phase and quadrature correlators (42, 44) the output signals of which are used to address a look-up table (50) for conversion to amplitude and phase sample signals. Corresponding amplitude sample signals are integrated and stored in a plurality of registers (96) and for each symbol, the register (96) storing the maximum value is ascertained to identify the associated sample number, which is stored in a sample number register (160). This sample number is utilized to determine the time of a symbol clock signal (RXCLK) used for clocking the received data.

REFERENCES:
patent: 4995052 (1991-02-01), Thorvaldsen
patent: 5031191 (1991-07-01), Hiramatsu et al.
patent: 5038362 (1991-08-01), Takeuchi et al.
Moshem Kavehrad and George E. Bodeep, "Design and Experimental Results for a Direct-Sequence Spread-Spectrum Radio Using Differential Phase-Shift Keying Modulation for Indoor, Wireless Communications", IEEE Journal on Selected Areas In Communications, vol. SAC-5 (Jun. 1987), pp. 815-823.

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