COFFEE: coexist wifi for ZigBee networks: a frequency overlay approach

The 2.4 GHz ISM band is becoming increasingly over crowded with the ubiquitous usage of WiFi and ZigBee systems. WiFi Access Points (APs) are widely used in urban area for ubiquitous Internet access. Most of them, such as IEEE 802.11g [7] system, are leveraging OFDM communication scheme, and working at the frequency band from 2.402 to 2.482 GHz. The OFDM systems divide the 20 MHz bandwidth into 64 orthogonal subcarriers, and use 52 of them for data transmission. Meanwhile, the Wireless Senor Networks (WSNs) are also applied for real time and long term environmental monitoring in urban area such as urban sensing (e.g., City See) [10], as well as medical health care applications [13]. Unfortunately, the WSNs also select the crowded 2.4 GHz ISM band for communications, which is an over crowded spectrum band.

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