Wireless Communication Systems
- 672 Downloads
With the turn of the new millennium, there has been an explosion in the usage of wireless equipment. Wireless cellular devices like mobile phones are now ubiquitous. Mobile Internet employing wireless devices is now available in most coffee shops in many countries. Such devices can achieve short-and medium-range coverage. Devices with short-range coverage are based on communications standards like Bluetooth , while medium-range coverage devices are based on the wireless local area networks (WLAN) communications standards . The latter are categorized under two bands 2.4 and 5 GHz. The lower band is mainly based on the 802.11b standard and employs the complementary code keying (CCK) modulation . The higher band (5 GHz) is based on the 802.11a standard and employs the orthogonal frequency division multiplexing (OFDM) modulation. Recently, the same OFDM modulation has been ported to the lower frequency of 2.4 GHz of 802.1 1b. This standard was termed 802.11g.
KeywordsOrthogonal Frequency Division Multiplex Wireless Local Area Network Local Oscillation Wireless Communication System Frequency Synthesizer
Unable to display preview. Download preview PDF.
- IEEE Bluetooth Drafts Standards, http://grouper.ieee.org/groups/Bluetooth/Google Scholar
- IEEE 802.11 Drafts Standards, http://grouper.ieee.org/groups/802/11/Google Scholar
- G. Chien et al., “A 2.4 GHz CMOS Transceiver and Baseband Processor Chipset for 802.11b Wireless LAN Application,” IEEE International Solid-State Circuits Conference Digest of Technical Papers, Feb. 2003, pp. 356–357.Google Scholar
- B. Razavi and P. Zhang, “Mixer Noise Reduction Technique,” US Patent, 6,748,204, June 2004.Google Scholar
- J.A. Weldon, et al., “A 1.75 GHz Highly-Integrated Narrow-Band CMOS Transmitter with Harmonic-Rejection Mixers,” IEEE Solid-State Circuits Conference, 2001. Digest of Technical Papers, 2001 IEEE International 5–7 Feb. 2001, pp. 160–161, 442.Google Scholar