Multi-rate IEEE 802.11b WLAN.

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... Wireless Local Area Network (WLAN) standards [1][2][3][4] have been globally accepted and adopted to provide wireless broadband access services in office, home and city hotspot areas. They can support multiple transmission data rates according to the channel conditions between wire- less users (or stations) and Access Point (AP). Specifically, Fig. 1 shows an IEEE 802.11b WLAN [2]. Zones I, II, III and IV contain A, B, C and D stations respectively, which use the data-rates of 11, 5.5, 2 and 1 Mbps to access the Access Point (AP). Stations F, E and D are considered low data rate stations at Fig. 1. These stations have negative effects on performance of overall throughput in the ...

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... channel conditions between wire- less users (or stations) and Access Point (AP). Specifically, Fig. 1 shows an IEEE 802.11b WLAN [2]. Zones I, II, III and IV contain A, B, C and D stations respectively, which use the data-rates of 11, 5.5, 2 and 1 Mbps to access the Access Point (AP). Stations F, E and D are considered low data rate stations at Fig. 1. These stations have negative effects on performance of overall throughput in the network. Comparing to stations B and A which have high data rate stations but low data rate stations occupy the shared communication channel to transmit its fixed packet to AP, such as reason for reducing the channel efficiency and overall system ...

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... each other's resources, thus achieving cooperative diversity or user cooperative diversity [6][7][8][9][10][11][12][13]. As a promising application of cooperative communication in multi-rate WLANs, a low data-rate station can use a neighboring station as a relay to forward its informa- tion to the AP [14][15][16][17][18][19]. For example, in Fig. 1, station-E in zone-IV can use station-A to relay its information to the AP, instead of directly transmitting it to the AP at a low data-rate of 1 Mbps. As station-A is located in zone-I, its transmission data-rate to the AP, i.e. the data-rate between the relay and the destination R rd is 11 Mbps. If the data-rate between the source ...

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... can be seen in Fig. 1, stations A and B in zones I and II are defined as high data-rate stations, which always communicate directly with the AP and can act as source and relay stations, while stations C-E-F-D, which in zones III and IV are low data-rate stations, can only act as source stations and each of them needs a high data-rate relay station to ...