# US 2013/0156136 A1 · Apparatus and method for iterative detection and decoding in wireless communication system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2013/0156136 A1 - Document ID: US20130156136A1 - Status: Published application - Kind: A1 - Application number: 13/609,618 - Filed: 2012-09-11 - Published: 2013-06-20 - Earliest claimed: 2011-12-14 - Assignees: Electronics and Telecommunications Research Institute - Inventors: Yong Ho LEE; Pan Soo KIM; Deock Gil OH - Web page: https://patentgrep.com/patent/US20130156136A1 ## CPC - H04L 1/005: {Iterative decoding, including iteration between signal detection and decoding operation} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract Provided is an apparatus and method for iteratively detecting and decoding a received signal in a wireless communication system. An apparatus for iterative detection and decoding (IDD) in a wireless communication system may determine a predetermined group to be updated in a first soft decision sequence, may transmit detection control information of the determined group, and may generate a second soft decision sequence based on a detection operation result of a predetermined received signal portion that is extracted based on the detection control information. ## Claims ### Claim 1 An apparatus for iterative detection and decoding in a wireless communication system, the apparatus comprising: an update controller to determine a predetermined group to be updated in a first soft decision sequence, and to transmit detection control information of the determined group; and a detector to generate a second soft decision sequence based on a detection operation result of a predetermined received signal portion that is extracted based on the detection control information. ### Claim 2 (depends on 1) The apparatus of claim 1, wherein the detector comprises: a received signal extractor to extract a predetermined received signal portion from a received signal sequence based on the detection control information; and a partial updater to generate the second soft decision sequence by updating a soft decision value of a portion corresponding to the determined group in the first soft decision sequence, based on the detection operation result of the extracted received signal portion. ### Claim 3 (depends on 1) The apparatus of claim 1, wherein the update controller comprises: a divider to divide the first soft decision sequence with a predetermined length into a plurality of groups based on a predetermined criterion. ### Claim 4 (depends on 3) The apparatus of claim 3, wherein the update controller further comprises: a determining unit to determine groups to be updated among the plurality of groups based on a predetermined criterion. ### Claim 5 (depends on 1) The apparatus of claim 1, wherein the update controller comprises: a transmitter to transmit detection control information comprising an index of the determined group, length information of the determined group, and additional control information. ### Claim 6 (depends on 2) The apparatus of claim 2, wherein when a recursive operation requiring an initialization is included in an operation of the detector, the received signal extractor extracts a predetermined received signal portion from the received signal sequence by adding a traceback length to front or back of a portion corresponding to the determined group in the received signal sequence. ### Claim 7 (depends on 2) The apparatus of claim 2, wherein when a recursive operation requiring an initialization is not included in an operation of the detector, the received signal extractor extracts a received signal portion corresponding to the determined group from the received signal sequence. ### Claim 8 (depends on 1) The apparatus of claim 1, wherein the detector performs a detection operation with respect to the extracted received signal portion. ### Claim 9 (depends on 2) The apparatus of claim 2, wherein the partial updater comprises: a soft decision value calculator to calculate the soft decision value of the portion corresponding to the determined group in the first soft decision sequence, based on the detection operation result and information about the determined group. ### Claim 10 (depends on 9) The apparatus of claim 9, wherein the partial updater further comprises: an updater to update, with the calculated soft decision value, the portion corresponding to the determined group in the first soft decision sequence. ### Claim 11 (depends on 1) The apparatus of claim 1, further comprising: a de-interleaver to perform de-interleaving of the second soft decision sequence; a decoder to generate a third soft decision sequence by performing decoding using a predetermined decoding algorithm with respect to the de-interleaved second soft decision sequence; and an iteration controller to control whether to perform iterative detection and decoding by determining whether the number of iterative detections satisfies a predetermined number of times. ### Claim 12 A method for iterative detection and decoding in a wireless communication system, the method comprising: determining a predetermined group to be updated in a first soft decision sequence, and transmitting detection control information of the determined group; extracting a predetermined received signal portion from a received signal sequence based on the detection control information; and generating a second soft decision sequence by updating a soft decision value of a portion corresponding to the determined group in the first soft decision sequence, based on the detection operation result of the extracted received signal portion. ### Claim 13 (depends on 12) The method of claim 12, wherein the transmitting comprises: dividing the first soft decision sequence with a predetermined length into a plurality of groups having the same length. ### Claim 14 (depends on 13) The method of claim 13, wherein the transmitting further comprises: determining, as groups to be updated among the plurality of groups, groups of which measured signal to noise ratio (SNR) is less than or equal to a predetermined threshold. ### Claim 15 (depends on 12) The method of claim 12, wherein each of the first soft decision sequence and the second soft decision sequence is a log likelihood ratio (LLR). ### Claim 16 (depends on 12) The method of claim 12, wherein the generating comprises: calculating the soft decision value of the portion corresponding to the determined group in the first soft decision sequence, based on the detection operation result and information about the determined group. ### Claim 17 (depends on 16) The method of claim 16, wherein the generating further comprises: updating, with the calculated soft decision value, the portion corresponding to the determined group in the first soft decision sequence. ### Claim 18 (depends on 12) The method of claim 12, further comprising: performing de-interleaving of the second soft decision sequence; generating a third soft decision sequence by performing decoding using a predetermined decoding algorithm with respect to the de-interleaved second soft decision sequence; and performing interleaving of the third soft decision sequence when the number of iterative detections does not satisfy a predetermined number of times.