This project introduces the long-awaited collision detection feature to the wireless CSMA networks. This functionality enables the wireless nodes to identify an ongoing collision with the help of signature correlation on a listener antenna.

This technique computes the optimal transmission rate in wireless networks. It estimates the channel behavior from symbol level dispersion and then emulates transmission in other rates under this dispersion. The maximum successful rate in emulation is considered optimal.

We break away from wasteful time domain channel contention and place the backoff operation in frequency domain. The system treats OFDM subcarriers as integer numbers and contending nodes signal on a randomly chosen subcarrier for contention.

We come up with a precise indoor localization system by exploiting detailed physical layer information of the WiFi channel. PinLoc creates a location signature with the help of certain properties of OFDM subcarriers.