Downlink baseband receiver channel estimation in LMS-OFDM systems

摘要

World level transmission of information requires transmitter and receiver units to transmit any kind of information via wired and wireless communication system. A transmitter unit includes signal mapper, encoder, Serial to Parallel converter (S/P), and Inverse Fast Fourier Transform (IFFT) and guard interval. Reverse process of transmitter unit is called receiver. The proposed downlink base band receiver is designed with two transmitting antenna and one receiving antenna to provide high quality synchronization and channel estimation. A new Least Mean Square-Orthogonal Frequency Division Multiplexing (LMS-OFDM) technique is housed in the channel estimator of proposed wireless communication system to improve efficiency of the transmission. The objective of LMS algorithm is to acquire the useful information from a noisy signal. Implementation of LMS-OFDM block is possible only with the knowledge of the input signal statistics, almost unknown for the real-world problems. Proposed algorithm is simulated and tested by Simulink tool box present in MATLAB-12.1 and the performance analysis is carried out by the measurement of Bit Error Rate (BER) and Mean Square Error (MSE).