Patent ID: 9160597
Filing Date: 2015-10-13
Classification: H04L

Abstract:
1. A method of estimating an orthogonal frequency division multiplexing (OFDM) integer frequency offset, comprising: generating N combined sub-carrier components by superposing G received sub-carrier components of N received sub-carrier components constituting a received OFDM symbol; obtaining primary correlated values by summing interval correlated values obtained by performing correlation operations on the combined sub-carrier components and local training symbols in respective coherence phase bandwidth (CPB) intervals with respect to primary integer frequency offset candidate values d=0, G, . . . , └N/G┘G, and then outputting an integer frequency offset candidate value d producing a largest primary correlated value as a primary estimated integer frequency offset value {tilde over (ε)} obtaining secondary correlated values by summing interval correlated values obtained by performing correlation operations on the sub-carrier components and the local training symbols in respective CPB intervals with respect to secondary integer frequency offset candidate values {tilde over (d)}={tilde over (ε)}, {tilde over (ε)}+1, . . . , {tilde over (ε)}+G−1 based on the primary estimated integer frequency offset value {tilde over (ε)}