US 2001/0022809 A1 · Receiver for spectrum spreading communication system

Abstract

A receiver for a spread spectrum communication system comprises an acquiring circuit that periodically acquires in synchronization a plurality of signals received via a plurality of paths different in route from a transmitter; a plurality of tracking circuits that track in synchronization a predetermined number of signals among the plurality of signals acquired by the acquiring circuit, respectively; a judging circuit that judges whether present and past propagation condition of the predetermined signals tracked by the plurality of tracking circuits are good or bad; a selecting circuit that selects the predetermined number of signals from the plurality of signals acquired by the acquiring circuit, based upon the present and past propagation condition of the signal judged by the judging circuit, to allow the plurality of tracking circuits to track the predetermined number of signals selected by the selecting circuit.

Claims20

Dependent claims

A receiver for a spread spectrum communication system comprising:

an acquiring circuit that periodically acquires in synchronization a plurality of signals received via a plurality of paths different in route from a transmitter;
a plurality of tracking circuits that track in synchronization a predetermined number of signals among the plurality of signals acquired by the acquiring circuit, respectively;
a judging circuit that judges whether present propagation condition and past propagation condition of the predetermined signals tracked by the plurality of tracking circuits are good or bad;
a selecting circuit that selects the predetermined number of signals from the plurality of signals acquired by the acquiring circuit, based upon the present propagation condition and the past propagation condition of the signal judged by the judging circuit, to allow the plurality of tracking circuits to track the predetermined number of signals selected by the selecting circuit.

1 more element

A receiver for a spread spectrum communication system comprising:

an acquiring unit that periodically acquires a plurality of signals received via a plurality of different paths from a transmitter;
and
a plurality of tracking units that track the plurality of signals acquired by the acquiring unit, respectively,
wherein the acquiring unit allows one tracking unit to continue acquiring the signal that the tracking unit is tracking, and allows the other tracking units to commence tracking the signals that the acquiring unit newly acquires, upon judging there is no signal common to all the signals that the tracking units are tracking and all the signals that the acquiring unit newly acquires.

1 more element

A synchronization acquiring apparatus comprising:

a plurality of synchronization tracking circuits;
first flags each provided for one of said synchronization tracking circuits, each of the first flags being brought into a flag-off condition upon initiation of a synchronization acquiring operation and into a flag-on condition when a synchronizing position of a reception response agrees with a synchronizing position being tracked by a corresponding one of said synchronizing tracking circuits;
and
second flags each provided for one of said synchronization tracking circuits, each of the second flags being brought into the flag-on condition when a synchronizing position is allocated to a corresponding one of said synchronization tracking circuits and into the flag off condition when the synchronizing position of the reception response agrees with the synchronizing position being tracked by a corresponding one of said synchronizing tracking circuits during a subsequent synchronization acquiring operation, each of the second flags being kept in the flag-off condition until the synchronizing position is allocated to a corresponding one of said synchronization tracking circuits.

1 more element

Dependencies are inferred from the claim text.

Receiver for spectrum spreading communication system

Life of this patent

Receiver for spectrum spreading communication system

Life of this patent

Abstract

Claims20