A link activation protocol for a mobile communication network with directive/adaptive antennas

A non-centralized (non-cellular) mobile communication network with directive/adaptive antennas is proposed. Every node uses directive/adaptive antennas for transmitting and receiving communication signals. The spatial and temporal synchronization of transmitting and receiving antenna beams are accomplished by employing Global Positioning System (GPS) information and a double-ended spatial search algorithm. The communication link setup between a communication transmitter (CT) and a communication receiver (CR) depends on the successes of both forward and reverse links. A CR uses a non-coherent matched filter receiver and a signal power estimator to determine accept/reject of the incoming signals from CT in AWGN channels. Without knowing the exact location of CR, a CT has to search for the CR in different directions using different transmission power level. In a hostile environment, a search algorithm is developed by maximizing the probability of linking without intercept for a CT in every search trial. Updating the statistical information of CR location by a CT after every search also reduces the uncertainty of CR location and the search time.