Patent ID: 7355959

Claim:
A method for suppressing interference in a time-frequency hopped, ultra wide bandwidth system, comprising: receiving signals corresponding to a transmitted symbol; frequency demodulating the received signals; estimating a coefficient vector w that minimizes a cost function C â¡ ( w n ) = 1 âˆ‘ k â¢ Î» ï˜ƒ n - k ï˜„ â¢ âˆ‘ k â¢ Î» ï˜ƒ n - k ï˜„ â¢ â¢ ï˜ƒ w n H â¢ â¢ x k - c k ï˜„ 2 , where Î» is a weighting factor between 0, x is a vector representing the received signals, H is a frequency response of a channel used to transmit the symbol, and c is a known training symbol; determining a coefficient vector Åµ n ={circumflex over (R)} n âˆ’1 {circumflex over (d)} n , where a correlation matrix for the received signals is R ^ n = 1 âˆ‘ k â¢ Î» ï˜ƒ n - k ï˜„ â¢ âˆ‘ k â¢ Î» ï˜ƒ n - k ï˜„ â¢ x k â¢ x k H , and an estimate of a crosscorrelation is d ^ n = 1 âˆ‘ k â¢ Î» ï˜ƒ n - k ï˜„ â¢ âˆ‘ k â¢ Î» ï˜ƒ n - k ï˜„ â¢ x k â¢ c k * ; and combining the received signals according to c ^ n = 1 C â¡ ( w ^ n ) â¢ w ^ n H â¢ x n = 1 1 - w ^ n H â¢ d ^ n â¢ w ^ n H â¢ x n .