Receiver for recovering data in a forward and reverse direction in time
AssigneeMotorola, Inc.
InventorsHenry L. Kazecki, James C. Baker
Life of this patent
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Abstract
A differential quadrature PSK receiver (100) recovers serial data in a forward and reverse direction in time using a forward and reverse mode PLL (232) and decoder switch (108). The DQPSK receiver (100) is particularly useful for recovering a packet of serial data (Rx) having a time-varying signal level and a relatively long duration. Sync words in the packet (Rx) or adjacent packets (Ry) provide starting points from which the data is recovered. The direction in time of data recovery is dependent on the quality of the time-varying signal level in the packet (Rx).
Claims21
An apparatus for recovering at least one signal packet included in a serial data signal, wherein the packet is formed of multiple sequential symbols and at least one predetermined symbol, the at least one predetermined symbol having a predetermined position and value, said apparatus comprising:
- means for receiving the serial data signal;
- means for determining a direction in time of recovery for at least one symbol sequential to the at least one predetermined symbol;
- means for recovering said at least one symbol in said determined direction;
- means for changing between said determined direction and a second direction;
- and
- means for storing said at least one recovered symbol.
A method for recovering at least one signal packet included in a serial data signal, wherein the packet is formed of multiple sequential symbols and at least one predetermined symbol, the at least one predetermined symbol having a predetermined position and value, said method comprising:
- receiving the serial data signal;
- determining a direction in time of recovery for at least one symbol sequential to the at least one predetermined symbol;
- recovering said at least one symbol in said determined direction;
- changing between said determined direction and a second direction;
- and
- storing said at least one recovered symbol.
An apparatus for recovering at least one signal packet included in a serial data signal, wherein the packet is formed of multiple sequential symbols and at least a first and second predetermined symbol, said at least first and second predetermined symbols each having a predetermined position and value, said apparatus comprising:
- means for receiving the serial data signal;
- means for recovering at least one symbol sequential to the first predetermined symbol in a forward direction in time;
- means for recovering at least one symbol sequential to the second predetermined symbol in a reverse direction in time;
- and
- means for storing said recovered at least one symbol.
A method for recovering at least one signal packet included in a serial data signal, wherein the packet is formed of multiple sequential symbols and at least a first and second predetermined symbol, said at least first and second predetermined symbols each having a predetermined position and value, said method comprising the steps of:
- receiving the serial data signal;
- recovering at least one symbol sequential to the first predetermined symbol in a forward direction in time;
- recovering at least one symbol sequential to the second predetermined symbol in a reverse direction in time;
- and
- storing said recovered at least one symbol.
Dependencies are inferred from the claim text.