METHOD AND APPARATUS FOR ORTHOGONALLY OVERLAYING VARIABLE CHIP RATE SPREAD SPECTRUM SIGNALS
First Claim
1. A method comprising:
- spreading one or more narrow-band carrier frequency signals and a wideband carrier frequency signal using orthogonal codes, wherein the one or more narrow-band carrier frequency signals are aligned with respect to the wideband carrier frequency signal according to an offset; and
further spreading the wideband carrier frequency signal into a plurality of data streams, wherein each of the data streams are spread individually, the data streams being recombined prior to transmission.
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Abstract
A system and method for transmitting wideband signals via a radio communication system adapted for transmitting narrow-band signals is described. A base station is used to transmit and receive a plurality of relatively narrow-band and a plurality of relatively wideband signals. The electromagnetic spectrum available to the plurality of narrow-band signals is selectively shared with the electromagnetic spectrum available to the wideband signals by systematically separating the orthogonal codes and the carrier frequencies used for transmission. The prefixes of the orthogonal codes are preferably mutually exclusive and the carrier frequencies are preferably separated by an offset. The offset may be substantially equal to an integer multiple of the narrow-band signal'"'"'s chip rate. Alternatively, the offset may be substantially equal to an odd multiple of one half the narrow-band signal'"'"'s chip rate in which case every other bit of the orthogonally encoded data is inverted.
19 Citations
20 Claims
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1. A method comprising:
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spreading one or more narrow-band carrier frequency signals and a wideband carrier frequency signal using orthogonal codes, wherein the one or more narrow-band carrier frequency signals are aligned with respect to the wideband carrier frequency signal according to an offset; and further spreading the wideband carrier frequency signal into a plurality of data streams, wherein each of the data streams are spread individually, the data streams being recombined prior to transmission. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An apparatus comprising:
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a spreader configured to spread one or more narrow-band carrier frequency signals and a wideband carrier frequency signal using orthogonal codes, wherein the one or more narrow-band carrier frequency signals are aligned with respect to the wideband carrier frequency signal according to an offset, wherein the spreader is configured to further spread the wideband carrier frequency signal into a plurality of data streams, the data streams being recombined prior to transmission. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification