초록 ▼

A method of performing antenna diversity in a wireless spread spectrum communication system is disclosed. A spread spectrum phase shift keyed (PSK) packet signal having data symbols formed from high rate mode chips is received in each of two respective spaced antenna of a spread spectrum receiver. T

A method of performing antenna diversity in a wireless spread spectrum communication system is disclosed. A spread spectrum phase shift keyed (PSK) packet signal having data symbols formed from high rate mode chips is received in each of two respective spaced antenna of a spread spectrum receiver. The bit sync peak sample is determined within the packet signal for each antenna. Predetermined bit sync samples are subtracted a predetermined number of chips on either side of the bit sync peak sample from the peak for each antenna. The antenna having the higher value obtained in the subtracting step accomplished for each antenna is selected.

대표청구항 ▼

A method of performing antenna diversity in a wireless spread spectrum communication system is disclosed. A spread spectrum phase shift keyed (PSK) packet signal having data symbols formed from high rate mode chips is received in each of two respective spaced antenna of a spread spectrum receiver. T

A method of performing antenna diversity in a wireless spread spectrum communication system is disclosed. A spread spectrum phase shift keyed (PSK) packet signal having data symbols formed from high rate mode chips is received in each of two respective spaced antenna of a spread spectrum receiver. The bit sync peak sample is determined within the packet signal for each antenna. Predetermined bit sync samples are subtracted a predetermined number of chips on either side of the bit sync peak sample from the peak for each antenna. The antenna having the higher value obtained in the subtracting step accomplished for each antenna is selected. mplex signal using an analog-to-digital converter. 5. A direct sequence spread spectrum receiver for recovering a data value from a received signal in a direct sequence spread spectrum receiver, said received signal having a chip period Tc,a bit period Tband being modulated by first code sequence Caor second code sequence Cbgenerated by interleaving groups of M chips from a pseudo-noise sequence C=(C1,C2,C3,. . . , CN) of length N with elements Ci=±1, said second code sequence Cbhaving elements Cb(2jM+i)=C(jM+i)Cb((2j+1)M+i)=-C(jM+i) where j=0, . . . , N/M -1 and i=1, . . . , M; said receiver comprising: a converter operable to transform said received signal to a complex baseband signal having in-phase and quadrature components; a delay element operable to delay said complex baseband signal by a time MTc,equal to M chip periods, to obtain a complex delayed signal; a multiplier operable to multiply the complex baseband signal by the conjugate of the complex delayed signal to obtain a complex product signal; an integrator operable to integrate the real part of said complex product signal over the bit period Tbto obtain an integrated value; and a decision logic circuit operable to determine said data value from said integrated value. 6. A direct sequence spread spectrum receiver as in claim 5, wherein said first code sequence Cahas length 2N and elements Ca(2jM+i)=C(jM+i)Ca((2j+1)M+i)=C(jM+i) 7. A direct sequence spread spectrum receiver as in claim 5, wherein said first code sequence Cais C and has length N.