Method and apparatus for generating a simulcast response from a

Details Method and apparatus for generating a simulcast response from a Method and apparatus for generating a simulcast response from a

1993-08-27

1996-06-25

Yusko, Donald J.

Communications: electrical

Continuously variable indicating

With meter reading

34082544, 34082554, H04Q 900

Patent

active

055304370

ABSTRACT:
A method and apparatus identify (822) respondents to a poll transmitted (806) in a radio communication system (100) comprising a transmitter (104) and a plurality of receivers (103, 105). A subset of a plurality of portable communication units (PCUs) (108) are each programmed (804, 806) with a bit pattern (510, 512, 514) corresponding uniquely to each PCU (108) and chosen such that when a group of at least two PCUs (108) are received simultaneously, the resultant received interference bit pattern provides a non-zero probability of correctly identifying at least a portion of the group, and a substantially zero probability of erroneously identifying a PCU (108) not in the group. The method further comprises the steps of transmitting (808) thereafter from the subset of PCUs (108) simultaneous, co-channel responses to the poll, each response comprising one of the programmed bit patterns (510, 512, 514), and determining (822) therefrom identities of received PCUs (108) by the interference bit patterns received at the plurality of receivers (103, 105).

REFERENCES:
patent: 4875038 (1989-10-01), Siwiak et al.
patent: 4896151 (1990-01-01), Kuranami et al.
patent: 4918437 (1990-04-01), Jasinski et al.
patent: 5124697 (1992-06-01), Moore
patent: 5153582 (1992-10-01), Davis
patent: 5162790 (1992-11-01), Jasinski
patent: 5339073 (1994-08-01), Dodd et al.

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