Preamble capture and medium access control

摘要

An apparatus and method for wireless communications configured to receive simultaneous transmissions from a plurality of wireless devices, with each of the transmissions having a reference signal, acquire the reference signals and, based on information obtained from the acquisition of the reference signals, select the transmission from one of the wireless devices for timing synchronization and decoding.

主权项

1. An apparatus for wireless communications, comprising:
a wireless interface configured to receive simultaneous transmissions from a plurality of wireless devices via a wireless communication medium, each of the transmissions having a reference signal; and a searcher configured to:
acquire the reference signals;distinguish between the wireless devices by comparing information obtained from the acquisition of the reference signals with information obtained from the acquisition of reference signals of previously received transmissions from the wireless devices, wherein the information being compared comprises delay spread of each reference signal induced by the wireless communication medium;determine the delay spread by correlating each of the reference signals with a corresponding one of local signals at a plurality of time slots, the delay spread being characterized by a pattern of the time slots at which the correlation exceeds a threshold; andbased on information obtained from the acquisition of the reference signals, select the transmission from one of the wireless devices for timing synchronization and decoding.