Abstract:

Considering timing offset (TO), carrier frequency offset (CFO) and sampling frequency offset (SFO) comprehensively in battle field frequency hopping orthogonal frequency division multiplexing (FH-OFDM) application, a pilot aided joint synchronization and channel estimation algorithm is proposed to improve bit error rate (BER) performance. TO and inter-carrier interference are compensated in time domain. Channel impulse response, CFO and SFO are estimated by a recursive least square algorithm with linear error function. A new maximum likehood algorithm is proposed to estimate parameters’ initial value using in iteration, thus the estimative precision is improved. System balance expression is presented for bandwidth efficiency and hopping rate. Simulation results show that the estimative mean square error and BER performances of the proposed algorithm outperform conventional algorithms under the condition of 1 000 hop/s in FH-OFDM systems.