Error correction of MSK signals dependent on sample quality
First Claim
1. A method for error correction of MSK-coded data comprising the steps of:
- receiving a signal partitionable into adjacent frames each subdividable into three parts, wherein a fundamental frequency of the signal is fixed within a frame of the adjacent frames and represents a logical state of an MSK-coded data bit, and wherein the signal has a known phase relationship between the adjacent frames;
synthesizing a first sample quality metric applicable to a portion of the signal associated with a last part of the parts of a first frame of the adjacent frames and a second sample quality metric applicable to a portion of the signal associated with a first part of the parts of a second frame following the first frame, wherein each of the first and second sample quality metrics have a magnitude dependent on a time that the associated portion of the signal has a magnitude different than an average magnitude of the signal; and
determining a corrected polarity of the portion of the signal associated with the last part of the parts of the first frame dependent on a sample quality metric having a greater magnitude of the first sample quality metric and the second sample quality metric and providing a corrected MSK-coded data bit dependent thereon.
3 Assignments
0 Petitions
Accused Products
Abstract
A method and corresponding apparatus for error correction of MSK-coded data receives a signal (101) partitionable into adjacent frames (111,113) each subdividable into three tridents (103, 105, 107). A first sample quality metric (225) applicable to a p (123) of the signal (101) associated with a last trident (107) of the tridents of a first frame (111) of the adjacent frames (111, 113) is synthesized, and a second sample quality metric (227) applicable to a portion (125) of the signal (101) associated with a first trident (103'"'"') of the tridents of a second frame (113) following the first frame (111) is synthesized. Each of the first and second sample quality metrics (225, 227) have a magnitude dependent on a time that the associated portion (123) of the signal (101) has a magnitude exceeding an average magnitude (127) of the signal (101). A corrected polarity (113) of the portion of the signal (101) associated with the last trident (107) of the tridents of the first frame (111) is determined dependent on a sample quality metric having a greater magnitude of the first sample quality metric (225) and the second sample quality metric (227).
-
Citations
15 Claims
-
1. A method for error correction of MSK-coded data comprising the steps of:
-
receiving a signal partitionable into adjacent frames each subdividable into three parts, wherein a fundamental frequency of the signal is fixed within a frame of the adjacent frames and represents a logical state of an MSK-coded data bit, and wherein the signal has a known phase relationship between the adjacent frames; synthesizing a first sample quality metric applicable to a portion of the signal associated with a last part of the parts of a first frame of the adjacent frames and a second sample quality metric applicable to a portion of the signal associated with a first part of the parts of a second frame following the first frame, wherein each of the first and second sample quality metrics have a magnitude dependent on a time that the associated portion of the signal has a magnitude different than an average magnitude of the signal; and determining a corrected polarity of the portion of the signal associated with the last part of the parts of the first frame dependent on a sample quality metric having a greater magnitude of the first sample quality metric and the second sample quality metric and providing a corrected MSK-coded data bit dependent thereon. - View Dependent Claims (2, 3, 4, 5)
-
-
6. A method for error correction of MSK-coded data comprising the steps of:
-
receiving a signal partitionable into adjacent frames each subdividable into three tridents, wherein a fundamental frequency of the signal is fixed within a frame of the adjacent frames and represents a logical state of an MSK-coded data bit, and wherein the signal has a continuous phase relationship between the adjacent frames; synthesizing a first sample quality metric applicable to a portion of the signal associated with a last trident of the tridents of a first frame of the adjacent frames and a second sample quality metric applicable to a portion of the signal associated with a first trident of the tridents of a second frame following the first frame, wherein each of the first and second sample quality metrics have a magnitude dependent on a time that the associated portion of the signal has a magnitude different than an average magnitude of the signal; determining an apparent polarity of the portion of the signal associated with the last trident of the tridents of the first frame, and another apparent polarity of the portion of the signal associated with the first trident of the tridents of the second frame; and determining a corrected polarity of the portion of the signal associated with the last trident of the tridents of the first frame different than the apparent polarity of the signal associated with the last trident of the tridents of the first frame when the apparent polarity and the another apparent polarity are equivalent, the determination dependent on a sample quality metric having a greater magnitude of the first sample quality metric and the second sample quality metric. - View Dependent Claims (7, 8, 9, 10)
-
-
11. An apparatus for error correction of MSK-coded data comprising:
-
a receiver system for receiving a signal partitionable into adjacent frames each subdividable into three parts, wherein a fundamental frequency of the signal is fixed within a frame of the adjacent frames and represents a logical state of an MSK-coded data bit, and wherein the signal has a continuous phase relationship between the adjacent frames; means for synthesizing a first sample quality metric applicable to a portion of the signal associated with a last part of the parts of a first frame of the adjacent frames and a second sample quality metric applicable to a portion of the signal associated with a first part of the parts of a second frame following the first frame, wherein each of the first and second sample quality metrics have a magnitude dependent on a time that the associated portion of the signal has a magnitude different than an average magnitude of the signal; and means for determining a corrected polarity of the portion of the signal associated with the last part of the parts of the first frame dependent on a sample quality metric having a greater magnitude of the first sample quality metric and the second sample quality metric and providing a corrected MSK-coded data bit dependent thereon. - View Dependent Claims (12, 13, 14)
-
-
15. An apparatus for error correction of MSK-coded data comprising:
-
a transmission system for transmitting a signal partitionable into adjacent frames each subdividable into three parts, wherein a fundamental frequency of the signal is fixed within a frame of the adjacent frames and represents a logical state of an MSK-coded data bit, and wherein the signal has a continuous phase relationship between the adjacent frames; a receiver system for receiving the signal and for providing a received signal; means for synthesizing a first sample quality metric applicable to a portion of the received signal associated with a last part of the parts of a first frame of the adjacent frames and a second sample quality metric applicable to a portion of the received signal associated with a first part of the parts of a second frame following the first frame, wherein each of the first and second sample quality metrics have a magnitude dependent on a time that the associated portion of the received signal has a magnitude different than an average magnitude of the received signal; and means for determining a corrected polarity of the portion of the received signal associated with the last part of the parts of the first frame dependent on a sample quality metric having a greater magnitude of the first sample quality metric and the second sample quality metric and providing a corrected MSK-coded data bit dependent thereon.
-
Specification