# US 7,609,750 B2 · Segment-wise channel equalization based data estimation > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 7,609,750 B2 - Document ID: US7609750B2 - Status: Granted - Kind: B2 - Application number: 12/277,918 - Filed: 2008-11-25 - Published: 2009-03-19 - Granted: 2009-10-27 - Earliest claimed: 2002-05-22 - Assignees: InterDigital Technology Corporation - Inventors: Jung-Lin Pan; Ariela Zeira - Web page: https://patentgrep.com/patent/US7609750B2 ## CPC - H04B 1/7105: Joint detection techniques, e.g. linear detectors - H04B 1/707: using direct sequence modulation - H04B: TRANSMISSION ## Abstract Data is estimated of a plurality of received spread spectrum signals by a wireless communication apparatus. The plurality of received communications are received in a shared spectrum. The received communications are sampled to produce a received vector of sequential samples. The received vector is processed to produce a plurality of segments. Each segment is processed separately to estimate data of the received communications. ## Claims ### Claim 1 A method for estimating data comprising: receiving a plurality of spread spectrum communication signals carrying data; sampling the received communication signals to produce a received vector; processing the received vector to produce a plurality of segments of sequential samples representing continuous portions of the received vector; and processing each segment separately to estimate data of the received communication signals. ### Claim 2 (depends on 1) The method of claim 1 wherein the processing each segment comprises equalizing each segment. ### Claim 3 (depends on 2) The method of claim 2 wherein segments are produced that each have a length greater than a length of an impulse response. ### Claim 4 (depends on 2) The method of claim 2 wherein segments are produced that each have a length of at least 180 samples. ### Claim 5 (depends on 2) The method of claim 2 wherein the processing each segment comprises despreading each equalized segment to recover data of that segment. ### Claim 6 (depends on 2) The method of claim 2 further comprising combining the equalized segments and despreading the equalized combined segments to recover data of the received vector. ### Claim 7 (depends on 2) The method of claim 2 wherein the equalizing each segment comprises at least one of the following: using a minimum mean square error model; solving a minimum mean square error model using fast Fourier transforms; solving a minimum mean square error model using Cholesky decomposition; solving a minimum mean square error model using approximate Cholesky decomposition; and using a least squares error model. ### Claim 8 A wireless communication apparatus for estimating data of a plurality of received spread spectrum communication signals received in a shared spectrum, the user equipment comprising: a sampling device configured to sample the received communication signals to produce a received vector of sequential samples; a segment-wise channel equalization data detection device configured to process the received vector to produce a plurality of segments representing continuous portions of the received vector; and the segment-wise channel equalization data detection device configured to process each segment separately to estimate data of the received communication signals. ### Claim 9 (depends on 8) The wireless communication apparatus of claim 8 wherein the segment-wise channel equalization data detection device is configured to equalize each segment. ### Claim 10 (depends on 9) The wireless communication apparatus of claim 9 wherein the segment-wise channel equalization data detection device is configured to process the received vector to produce segments that have a length greater than a length of an impulse response. ### Claim 11 (depends on 9) The wireless communication apparatus of claim 9 wherein the segment-wise channel equalization data detection device is configured to process the received vector to produce segments that have a length of at least 180 sequential samples. ### Claim 12 (depends on 9) The wireless communication apparatus of claim 9 wherein the segment-wise channel equalization data detection device is configured to despread each equalized segment to recover data of that segment. ### Claim 13 (depends on 9) The wireless communication apparatus of claim 9 wherein the segment-wise channel equalization data detection device is configured to combine the equalized segments and to despread the equalized combined segments to recover data of the received vector. ### Claim 14 (depends on 9) A user equipment comprising the wireless communication apparatus of claim 9. ### Claim 15 (depends on 9) A base station comprising the wireless communication apparatus of claim 9. ### Claim 16 (depends on 8) user equipment comprising the wireless communication apparatus of claim 8. ### Claim 17 (depends on 8) A base station comprising the wireless communication apparatus of claim 8. ### Claim 18 (depends on 9) The wireless communication apparatus of claim 9 wherein the segment-wise channel equalization data detection device includes at least one of the following segment equalizing components: a component configured to use a minimum mean square error model for equalizing each segment; a component configured to equalize each segment by solving a minimum mean square error model using fast Fourier transforms; a component configured to equalize each segment by solving a minimum mean square error model using Cholesky decomposition; a component configured to equalize each segment by solving a minimum mean square error model using approximate Cholesky decomposition; and a component configured to equalize each segment by using a least squares error model. ### Claim 19 (depends on 18) A user equipment comprising the wireless communication apparatus of claim 18. ### Claim 20 (depends on 18) A base station comprising the wireless communication apparatus of claim 18.