Interference suppression for OFDM-based UWB communication

Details Interference suppression for OFDM-based UWB communication Interference suppression for OFDM-based UWB communication

2008-04-08

2008-04-08

Ngo, Ricky Q. (Department: 2616)

Multiplex communications

Generalized orthogonal or special mathematical techniques

Particular set of orthogonal functions

C370S343000, C370S480000, C375S132000, C375S346000

Reexamination Certificate

active

07355959

ABSTRACT:
A method suppresses interference in a time-frequency hopped, ultra wide bandwidth system. Signals corresponding to a transmitted symbol are received. The received signals are frequency demodulated, and a coefficient vector w that minimizes a cost functionC⁡(wn)=1∑k⁢λn-k⁢∑k⁢λn-k⁢⁢wnH⁢xk-ck2,is estimated, where λ 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. A coefficient vector, ŵn={circumflex over (R)}n−1{circumflex over (d)}n, is determined, where a correlation matrix for the received signals isR^n=1∑k⁢λn-k⁢∑k⁢λn-k⁢⁢xk⁢xkH,and an estimate of a crosscorrelation isd^n=1∑k⁢λn-k⁢∑k⁢λn-k⁢⁢xk⁢ck*.The received signals are then combined according toc^n=1C⁡(w^n)⁢w^nH⁢xn=11-w^nH⁢⁢d^n⁢w^nH⁢xn.

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