标签：无线通信技术,
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The increased demand for mobile network connections
has lead to the establishment of RF interface standards
for Wireless Local Area Networks (WLANs). The
unlicensed ISM frequency band, 2.4–2.5 GHz, has been
designated for WLAN usage.Table 1[1] displays frequency
allocations in different parts of the world for WLAN. In the
US, IEEE 802.11 specifies two RF physical layer
interfaces for WLAN, Direct Sequence Spread Spectrum
(DSSS), and Frequency Hopped Spread Spectrum
(FHSS).
DSSS uses an 11-bit Barker code where each bit of
information is spread within a single channel. The IEEE
standard allocates 11 channels, each 22 MHz wide, with
5 MHz spacing between center frequencies in the
83.5 MHz band.This creates channels whose frequencies
overlap.，大小：3.06 MB
The increased demand for mobile network connections
has lead to the establishment of RF interface standards
for Wireless Local Area Networks (WLANs). The
unlicensed ISM frequency band, 2.4–2.5 GHz, has been
designated for WLAN usage.Table 1[1] displays frequency
allocations in different parts of the world for WLAN. In the
US, IEEE 802.11 specifies two RF physical layer
interfaces for WLAN, Direct Sequence Spread Spectrum
(DSSS), and Frequency Hopped Spread Spectrum
(FHSS).
DSSS uses an 11-bit Barker code where each bit of
information is spread within a single channel. The IEEE
standard allocates 11 channels, each 22 MHz wide, with
5 MHz spacing between center frequencies in the
83.5 MHz band.This creates channels whose frequencies
overlap.，大小：3.06 MB