Calculation of soft decision values using reliability information of the amplitude
AssigneeTelefonaktiebolaget L M Ericsson (publ)
InventorsBo Bernhardsson, Bengt Lindoff, Peter Malm
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Abstract
Method of, and arrangement and device for, decoding a communications signal in a digital communications system, where the communications signal is modulated according to a modulation scheme including amplitude information; generating a likelihood value for a received communications signal, decoding the communications signal based on at least the generated likelihood value, providing a reliability indication of the amplitude information conveyed by the received communications signal wherein the step of generating the likelihood value further comprises generating the likelihood value on the basis of the provided reliability indication of the amplitude information.
Claims25
A method of decoding a communications signal in a digital communications system, wherein the communications signal is modulated according to a modulation scheme including amplitude information, the method comprising:
- receiving a communications signal by a receiver modules;
- generating a likelihood value for a received communications signal, wherein the step of generating the likelihood value further comprises generating the likelihood value on the basis of the provided reliability indication of the amplitude information, wherein the reliability indication is provided by the receiver module;
- decoding the communications signal based on at least the generated likelihood value;
- and
- providing a reliability indication of the amplitude information conveyed by the received communications signal.
A method of decoding a communications signal in a digital communications system, wherein the communications signal is modulated according to a modulation scheme including amplitude information, the method comprising
- generating a likelihood value for a received communications signal, wherein the step of generating the likelihood value further comprises generating the likelihood value on the basis of the provided reliability indication of the amplitude information, the step of generating the likelihood value on the basis of the provided reliability indication further comprising determining whether an amplitude change by a predetermined magnitude has occurred within a predetermined time period;
- decoding the communications signal based on at least the generated likelihood value;
- and
- providing a reliability indication of the amplitude information conveyed by the received communications signal.
A method of decoding a communications signal in a digital communications system, wherein the communications signal is modulated according to a modulation scheme including amplitude information, the method comprising
- generating a likelihood value for a received communications signal, wherein the step of generating the likelihood value further comprises generating the likelihood value on the basis of the provided reliability indication of the amplitude information wherein the step of generating the likelihood value on the basis of the provided reliability indication of the amplitude information further comprises adjusting the likelihood value to a value corresponding to higher uncertainty of a predetermined bit value if an amplitude change has occurred and if said bit value is encoded using amplitude information;
- decoding the communications signal based on at least the generated likelihood value;
- and
- providing a reliability indication of the amplitude information conveyed by the received communications signal.
A method of decoding a communications signal in a digital communications system, wherein the communications signal is modulated according to a modulation scheme including amplitude information, the method comprising
- generating a likelihood value for a received communications signal, wherein the step of generating the likelihood value further comprises generating the likelihood value on the basis of the provided reliability indication of the amplitude information;
- decoding the communications signal based on at least the generated likelihood value;
- providing a reliability indication of the amplitude information conveyed by the received communications signal;
- and
- rejecting all received signal symbols received within a time interval comprising a predetermined number of consecutive slots, if a change in amplitude by a predetermined magnitude is detected in more than a predetermined fraction of slots of said number of consecutive slots.
A method of decoding a communications signal in a digital communications system, wherein the communications signal is modulated according to a modulation scheme including amplitude information, the method comprising
- generating a likelihood value for a received communications signal, wherein the step of generating the likelihood value further comprises generating the likelihood value on the basis of the provided reliability indication of the amplitude information;
- decoding the communications signal based on at least the generated likelihood value;
- and
- providing a reliability indication of the amplitude information conveyed by the received communications signal, wherein the communications signal is a communications signal of a High Speed Downlink Packet Access of a 3GPP Wideband Code Division Multiple Access.
An arrangement for decoding a communications signal in a digital communications system, where the communications signal is modulated according to a modulation scheme including amplitude information, the arrangement comprising:
- a receiver module for receiving the communications signal;
- processing means adapted to generate a likelihood value for a received communications signal, wherein the processing means is further adapted to generate the likelihood value on the basis of the provided reliability indication of the amplitude information, the receiver module being adapted to provide the reliability indication;
- a decoder for decoding the communications signal based on at least the generated likelihood value;
- and
- means for providing a reliability indication of the amplitude information conveyed by the received, communications signal.
An arrangement for decoding a communications signal in a digital communications system, where the communications signal is modulated according to a modulation scheme including amplitude information, the arrangement comprising:
- processing means adapted to generate a likelihood value for a received communications signal, wherein the processing means is further adapted to generate the likelihood value on the basis of the provided reliability indication of the amplitude information wherein the processing means is further adapted to determine whether an amplitude change by a predetermined magnitude has occurred within a predetermined time period;
- a decoder for decoding the communications signal based on at least the generated likelihood value;
- and
- means for providing a reliability indication of the amplitude information conveyed by the received, communications signal.
An arrangement for decoding a communications signal in a digital communications system, where the communications signal is modulated according to a modulation scheme including amplitude information, the arrangement comprising:
- processing means adapted to generate a likelihood value for a received communications signal, wherein the processing means is further adapted to generate the likelihood value on the basis of the provided reliability indication of the amplitude information wherein the processing means is further adapted to adjust the likelihood value to a value corresponding to higher uncertainty of a predetermined bit value if an amplitude change has occurred and if said bit value is encoded using amplitude information;
- a decoder for decoding the communications signal based on at least the generated likelihood value;
- and
- means for providing a reliability indication of the amplitude information conveyed by the received, communications signal.
An arrangement for decoding a communications signal in a digital communications system, where the communications signal is modulated according to a modulation scheme including amplitude information, the arrangement comprising:
- processing means adapted to generate a likelihood value for a received communications signal, wherein the processing means is further adapted to generate the likelihood value on the basis of the provided reliability indication of the amplitude information, wherein the processing means is further adapted to reject all received signal symbols received within a time interval comprising a predetermined number of consecutive slots, if a change in amplitude by a predetermined magnitude is detected in more than a predetermined fraction of slots of said number of consecutive slots;
- a decoder for decoding the communications signal based on at least the generated likelihood value;
- means for providing a reliability indication of the amplitude information conveyed by the received, communications signal.
An arrangement for decoding a communications signal in a digital communications system, where the communications signal is modulated according to a modulation scheme including amplitude information, the arrangement comprising:
- processing means adapted to generate a likelihood value for a received communications signal, wherein the processing means is further adapted to generate the likelihood value on the basis of the provided reliability indication of the amplitude information;
- a decoder for decoding the communications signal based on at least the generated likelihood value;
- and
- means for providing a reliability indication of the amplitude information conveyed by the received, communications signal, wherein the communications signal is a communications signal of a High Speed Downlink Packet Access of a 3GPP Wideband Code Division Multiple Access.
Dependencies are inferred from the claim text.