Pulse or digital communications – Receivers – Interference or noise reduction
Patent
1998-05-05
2000-01-25
Chin, Wellington
Pulse or digital communications
Receivers
Interference or noise reduction
370401, 4532772, H04L 103
Patent
active
060185554
ABSTRACT:
A network is disclosed which utilizes modified preambles in a communication network to facility antenna diversity and multipath compensation. In one embodiment, an antenna diversity protocol first directs a mobile transceiver to select any antenna that enables successful receipt and identification of at least a portion of the preamble, i.e., the selection of a satisfactory antenna. Once a satisfactory antenna is identified, the diversity protocol extracts from received portions of the preamble information necessary to determine whether there is enough preamble remaining to conduct a best antenna search. If so, the other antennas are sequentially selected to evaluate their performance. Thereafter, the diversity protocol directs the mobile transceiver to select the best antenna based on a performance comparison. If, however, the diversity protocol determines that there is not enough remaining preamble to conduct the best antenna search, the protocol directs the mobile transceiver to use the currently selected satisfactory antenna to receive the remainder of the communication packet. Providing an indication of remaining preamble, the preamble is either marked with at least one time stamp or contains at least two identifiably distinct preamble portions.
REFERENCES:
patent: 544692 (1895-12-01), Siwiak et al.
patent: 4513412 (1985-04-01), Cox
patent: 4777542 (1988-10-01), Ozaki
patent: 5339316 (1994-08-01), Diepstraten
patent: 5369801 (1994-11-01), Smith
patent: 5781540 (1998-07-01), Malcolm et al.
patent: 5781592 (1998-07-01), Masuda
Chin Wellington
Intermec IP Corp.
Tran Congvan
LandOfFree
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