Error detector circuit for receiver operative to receive discretely-encoded signals
AssigneeMotorola, Inc.
InventorsJoseph F. Thome, Arvind S. Arora, Niels Vinggaard
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Abstract
An error detector circuit, and an associated method, for a discrete receiver. The error detector circuit indicates bad frames of binary information signals which contain distorted bits of data in numbers so great as to prevent a convolutional decoder from generating, accurately, a decoded signal. When bit errors are detected in numbers beyond a first preselected value of the signal quality of a received signal combined with the detected number of bit errors forms a signal beyond a second preselected value, a bad frame is indicated.
Claims21
An error detector circuit for a receiver operative to receive a discretely-encoded signal at an input thereof, the error detector circuit operative to determine when a sequence of the discretely-encoded signal is comprised of an excessive number of signal portions of erroneous signal values, the error detector circuit comprising:
- a first detector coupled to the input to determine when signal portions of the sequence of the discretely-encoded signal received by the receiver are of erroneous signal values and to generate a first error signal of a value representative of the number of signal portions determined to be of the erroneous signal values;
- a second detector coupled to the input to determine the signal quality levels of the sequence of the discretely-encoded signal and to generate a signal-quality signal representative of signal quality levels determined thereat;
- a combiner coupled to the first and second detectors to combine the first error signal and the signal-quality signal to form thereby a weighted error signal;
- a signal generator coupled to the first detector and to the combiner to generate a received-signal sequence error signal when either:
- the weighted error signal is of a value beyond a first preselected value;
- or
- the first error signal is of a value beyond a second preselected value;
- wherein generation of the received-signal sequence error signal is indicative of when the sequence of the discretely-encoded signal is comprised of the excessive number of signal portions of the erroneous signal values.
A bad frame indicator for a receiver constructed to receive a discretely-encoded signal comprised of coded frames of a pre-determined number of bits, the bad frame indicator operative to detect when the receiver receives an invalid frame, the bad frame indicator comprising:
- means for determining when signal portions of a coded frame received by the receiver are of erroneous signal values and for generating a first error signal of a value representative of the number of signal portions of the coded frame determined to be of the erroneous signal values;
- means for determining signal quality levels of the coded frame and for generating a signal-quality signal representative of signal quality levels determined thereat and for generating a weighted error signal as a function of the signal quality level;
- means for generating a received-signal sequence error signal when the weighted error signal is of a value beyond a first preselected value and when the first error signal is of a value beyond a second preselected value wherein generation of the received-signal sequence error signal is indicative of when the receiver receives an invalid frame.
A radio receiver operative to receive a discretely-encoded signal, the radio receiver comprising:
- a demodulator for inputting a sequence of discretely encoded received signals:
- a first detector coupled to the demodulator to determine when signal portions of the sequence of the discretely-encoded signal received by the receiver are of erroneous signal values and for generating a first error signal of a value representative of the number of signal portions determined to be of the erroneous signal values;
- a second detector coupled to the demodulator and to the first detector to determine signal quality levels of the sequence of the discretely-encoded signal, to determine a signal-quality signal representative of signal quality levels determined thereat to generate a weighted error signal as a function of the first error signal and the signal-quality signal;
- a first generator coupled to the second detector to generate a received-signal sequence error signal when the weighted error signal is of a value beyond a first preselected value
- a second generator coupled to the first detector to generate a received signal sequence error signal when the the first error signal is of a value beyond a second preselected value;
- wherein generation of a received-signal sequence error signal is indicative of when the sequence of the discretely-encoded signal is comprised of the excessive number of signal portions of the erroneous signal values.
A method for determining when sequences of a discretely-encoded signal received by a receiver are comprised of an excessive number of signal portions of erroneous signal values, the method comprising the steps of:
- determining when signal portions of the sequence of the discretely-encoded signal received by the receiver are of erroneous signal values and for generating a first error signal of a value representative of the number of signal portions determined to be of the erroneous signal values;
- determining signal quality levels of the sequence of the discretely-encoded signal and for generating a signal-quality signal representative of signal quality levels determined thereat;
- combining the first error signal and the signal-quality signal theretogether to form thereby a weighted error signal;
- generating a received-signal sequence error signal when the weighted error signal is of a value beyond a first preselected value;
- and
- generating a received signal sequence error signal when the first error signal is of a value beyond a second preselected value.
Dependencies are inferred from the claim text.