Comb-Type Pilot Aided Channel Estimation for OFDM Systems
نویسندگان
چکیده
In this paper, a comb-type pilot arrangement method for OFDM channel estimation is investigated. Increasing the number of comb-type pilots, transmitted over a frequency selective radio channel, can decrease the data throughput while increasing the accuracy of the channel estimation. Using the LMS channel estimation and linear interpolation, we investigate the effects of number of pilots, as well as effects of channel Doppler frequency on the BER. Simulation results show that the BER improves significantly by increasing the number of pilots in fixed 4-QAM and 8QAM modulations, as well as in adaptive loading. Moreover, the number of transmitted bits in adaptive loading is 1.8 times that of the fixed modulation of 8-QAM. Index Terms — OFDM, Channel Estimation, Pilot arrangement, LMS, Comb-Type,
منابع مشابه
Channel Estimation in OFDM Systems
1 OFDM Background .....................................................2 2 Baseband Model ..........................................................2 3 Block-Type Pilot Channel Estimation .........................4 4 Comb-Type Pilot Channel Estimation.........................7 5 Other Pilot-Aided Channel Estimations ......................9 6 Performance Evaluation..................................
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