Patent ID: 8605806

Claim:
A wireless receiver to accurately detect a guard interval estimate in a presence of echoes and low signal-to-noise ratio (SNR) by performing a method of a Nth order polynomial based non-linear quantization on a pre-estimated guard interval in a received Orthogonal Frequency Division Multiplexing (OFDM) signal, wherein said pre-estimated guard interval is obtained by performing normalized auto-correlation on said received OFDM signal, wherein said pre-estimated guard interval comprises a plurality of mth coefficients of the polynomial, said wireless receiver comprising: a guard interval (GI) detector circuit that: performs a rounding operation on said plurality of m th coefficients of the polynomial and said pre-estimated guard interval to obtain an indexing parameter ‘k’, wherein said ‘k’ is calculated in accordance with an equation: k=RND(P(n){circumflex over (L)} n +P(n−1){circumflex over (L)} n−1 . . . P(0)); and detects said guard interval estimate based on a value of said k, and a guard interval of a plurality of guard intervals stored in a look up table, wherein said guard interval length is detected in accordance with an equation: {tilde over (L)}=L[k−4], wherein said ‘L’ is said guard interval stored in said look up table that corresponds to said value of said k.