Title :
Wideband overlay in IEEE 802.11 WLAN systems
Author_Institution :
Centre for Wireless Commun., Oulu, Finland
Abstract :
This paper examines the operation of IEEE 802.11 WLAN systems with a wideband overlay. The overlay is a DS-SS signal operating at 11 Mcps which utilises complex valued spreading sequences derived from the sequence used for the underlay system. The overlay sequence is orthogonal to the original sequence and has the same quasi-ideal auto-correlation (AC) properties. The overlay system examined uses a signal with is 10 dB lower in power than the underlay signal and offers 2 Mbps. The overlay signal can only be detected by receivers "tuned" to the complex spreading sequence. Receivers tuned to the original binary sequence are substantially unaffected by the overlay.
Keywords :
IEEE standards; broadband networks; correlation theory; pseudonoise codes; radio receivers; spread spectrum communication; telecommunication standards; wireless LAN; 11 MHz; 2 Mbit/s; DS-SS signal; IEEE 802.11 WLAN systems; complex spreading sequences; quasi-ideal auto-correlation properties; receivers; spread spectrum; underlay system; wideband overlay; Autocorrelation; Delay; Fading; Interference; Multipath channels; RAKE receivers; Spread spectrum communication; Standards development; Wideband; Wireless LAN;
Conference_Titel :
Spread Spectrum Techniques and Applications, 2002 IEEE Seventh International Symposium on
Conference_Location :
Prague, Czech Republic
Print_ISBN :
0-7803-7627-7
DOI :
10.1109/ISSSTA.2002.1048614
