Patent US4288132A successfully refreshed from Google Patents.
EP0924890A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Adaptive error correction for a communication link
Assignee: Whitaker LLC
•
Filing: 1998-12-15
•
Granted: —
•
Expires: 2018-12-15
Abstract
Abstract A method of data transfer between a transmitter and a receiver over a communications link achieves maximum throughput by dynamically adapting a coding rate, and specifically an error correction encoder, as a function of a measured reverse channel signal parameter. The method comprises the steps of transmitting a signal from the transmitter to the receiver, the receiver receiving and measuring the signal to noise ratio of the transmitted signal. The receiver determines an appropriate code rate and encoding technique as a function of the measured signal to noise ratio and transmits an encoding identifier (22) of the determined encoder to the transmitter. The transmitter encodes its data according to the encoding identifier (22) and transmits the encoded message (18) to the receiver. The receiver receives the encoded message (18) and decodes the message according to the determined code rate and encoding technique.
Inventors
- 👤 Dennis Martinez
- 👤 Thomas Hengeveld
- 👤 Michael Axford
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-04 04:39
CPC Classifications
H; H04; H04L; H04L1/00; H04L1/0001; H04L1/0036; H04L1/0038; H04L1/0009; H04L1/0023; H04L1/0025; H04L1/12; H04L1/16; H04L2001/0092; H04L2001/0093
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
128 words
A method of data transfer between a transmitter (4)
and a receiver (2) over a communications link (1)
comprising the steps of the transmitter (4) transmitting
an encoded signal and the receiver (2) receiving the
encoded signal, and decoding the signal according to a
predetermined coding scheme including the steps of: the receiver (2) measuring said received signal and
determining an error correction encoder as a function of
the measured signal, the receiver (2) transmitting an encoding identifier
(22) of the determined error correction encoder to the
transmitter (4), the transmitter (4) encoding a message according to
the determined error correction encoder, the transmitter (4) transmitting the encoded message
(18), the receiver (2) receiving the encoded message and
decoding the message according to the determined error
correction encoder.
Claim 2
Dependent Claim
34 words
A method according to claim 1 wherein the step of
transmitting an encoding identifier (22) further comprises
the step of transmitting error correction information for
the determined error correction encoder to the transmitter
(4).
Claim 3
Dependent Claim
31 words
A method according to claim 1 or 2 wherein the error
correction encoder is a Reed-Solomon encoder and wherein
the encoding identifier (22) comprises the number of Reed-Solomon
errors to correct.
Claim 4
Dependent Claim
31 words
A method according to claim 1 or 2 wherein the error
correction encoder is a BCH encoder and wherein the
encoding identifier (22) comprises the number of BCH
errors to correct.
Claim 5
Independent Claim
17 words
A method according to claims 1 or 2 wherein the error
correction encoder is a convolutional encoder.
Claim 6
Independent Claim
30 words
A method according to claims 1 or 2 wherein the error
correction encoder is a Reed-Solomon encoder and wherein
the encoding identifier (22) comprises the number of Reed-Solomon
parity symbols.
Claim 7
Independent Claim
30 words
A method according to claims 1 or 2 wherein the error
correction encoder is a BCH encoder and wherein the
encoding identifier (22) comprises the number of BCH
parity symbols.
Claim 8
Independent Claim
39 words
A method according to any one of claims 1 to 7
wherein the step of measuring the signal comprises
measuring the signal to noise ratio of the signal
transmitted by the transmitter (4) as received by the
receiver (2).
Claim 9
Independent Claim
38 words
A method according to any one of claims 1 to 7
wherein the step of measuring the signal comprises
measuring the absolute signal power of the signal
transmitted by the transmitter (4) as received by the
receiver (2).
Claim 10
Independent Claim
24 words
A method according to any one of claims 1 to 9
wherein the signal transmitted by the transmitter
comprises a channel access request (CAR).
Claim 11
Dependent Claim
30 words
A method according to claim 10 wherein the step of
transmitting the determined error correction encoder to
the transmitter is performed in a response to the channel
access request (CAR).
Claim 12
Dependent Claim
22 words
A method according to claim 10 or 11 wherein the
response to the channel access request (CAR) also includes
a reservation grant.
Claim 13
Independent Claim
24 words
A method according to any one of claims 1 to 12
wherein the signal transmitted by the transmitter (4) is a
message block (18).
Claim 14
Dependent Claim
31 words
A method according to claim 13 wherein the step of
transmitting the determined error correction algorithm to
the transmitter (4) is performed in a response to the
transmitted message block (18).
Claim 15
Independent Claim
37 words
A method according to any one of claims 1 to 14
wherein the step of determining the error correction
encoder comprises selection of an appropriate error
correction encoder from a fixed plurality of predetermined
error correction encoders.
Claim 16
Dependent Claim
35 words
A method according to claim 15 wherein the
transmitter (4) uses the encoding identifier (22) to
acquire error correction encoder information for the
determined error correction encoder from the plurality of
predetermined error correction encoders.
Claim 17
Independent Claim
150 words
A method of data transfer between a transmitter (4)
and a receiver (2) over a communications link (1)
comprising the steps of: a) the transmitter (4) transmitting a channel
access request signal (CAR), (b) the receiver (2) receiving and measuring the
signal to noise ratio of said channel access request
signal (CAR), (c) determining a number (m) of Reed/Solomon error
correction symbols as a function of the measured signal to
noise ratio, (d) transmitting a reservation grant (26) and the
determined number (m) of Reed-Solomon error correction
symbols to the transmitter (4), (e) the transmitter (4) encoding a Reed-Solomon
encoded message block (18) according to the determined
number (m) of Reed-Solomon error correction symbols, (f) the transmitter (4) transmitting the encoded
message block (18), (g) the receiver (2) receiving the encoded message
block (18) and decoding the message block (18) according
to the determined number (m) of error correction symbols.
Claim 18
Independent Claim
161 words
A method of data transfer between a transmitter (4)
and a receiver (2), the transmitter (4) and receiver (2)
having similar a priori knowledge of a plurality of error
correction encoders and the error correction information
associated with the error correction encoders comprising
the steps of: encoding a data block (18) according to a first
predetermined error correction encoder, the transmitter (4) transmitting the encoded data
block (18), the receiver (2) receiving the encoded data block
(18), decoding the data block (18) according to said first
error correction encoder, determining whether the data block (18) was
successfully decoded, the receiver (2) indicating to the transmitter (4)
whether the step of decoding the data block (18) was
successful or not, the transmitter (4) changing the error correction
encoder to a second error correction encoder if the step
of decoding was unsuccessful, the transmitter (4) changing the error correction
encoder to a third error correction encoder if the step of
decoding was successful.
Claim 19
Dependent Claim
34 words
A method according to claim 18 wherein the step of
decoding the data block (18) further comprises the steps
of decoding the data block (18) according to all of the
predetermined error correction encoders.
Claim 20
Independent Claim
35 words
A method according to claims 18 or 19 and further
comprising the step of inserting an encoding identifier
(22) into the data block (18) prior to the step of
transmitting the encoded data block (18).
Claim 21
Dependent Claim
32 words
A method according to claim 20 and further comprising
the step of inserting an encoding identifier (22) into the
data block (18) prior to the step of encoding the data
block (18).
Claim 22
Independent Claim
97 words
A method according to any one of claims 18 to 21
wherein the step of decoding the data block (18) further
comprises identifying a one or more of the predetermined
error correction encoders that achieved parity in the
decoding step and further comprising the step of the
receiver (2) deciphering the encoding identifier (22) in
the data blocks (18) that were decoded for each of the one
or more of the predetermined error correction encoders
that achieved parity and comparing the one or more
deciphered encoding identifiers (22) with the identified
error correction encoder that achieved parity.
Claim 23
Independent Claim
52 words
A method according to any one of claims 18 to 22
further comprising the steps of counting a number of
consecutive indications of a successful step of decoding
and the transmitter changing the error correction level if
the number of consecutive indications of a successful step
of decoding exceeds a predetermined threshold.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.