Article Published In Vol.2 (May-June-2014)

Performance Evaluation of LMS and VSS-LMS Channel Estimation Techniques for LTE Uplink under Different Modulation Types

Author : Mohammed H. M. Nerma and Nidaa M. H. Elshaikh

One of the essential goal of LTE is increasing speed and capacity without consuming high power especially in uplink, in order to save battery life of user equipment as long as possible. Since SC-FDMA achieves this, it has been utilized in the uplink of 3GPP LTE. However the high capacity and speed will affect the received data. This leads to the need of using channel estimation technique in the receiver (eNodeB) to recover the received signal. In this thesis SC-FDMA is modeled using MATLAB and then LMS and VSS-LMS channel estimation techniques are applied in order to evaluate their performance in terms of BER, MSE and algorithm complexity. The evaluation of the algorithms was done under different modulation techniques (BPSK and QPSK). The simulation results show that for QPSK both of BER and MSE has high values compared with BPSK. VSS-LMS algorithm has better performance than LMS in all cases; however it requires more multiplication and addition operations.

Keywords: BER, BPSK, LTE, MSE, QPSK, SC-FDMA, SNR, LMS, VSS-LMS