论文信息 - Bit Error Rate Evaluation of IEEE 802.16 (WiMAX) in OFDM System

Bit Error Rate Evaluation of IEEE 802.16 (WiMAX) in OFDM System

This paper investigates several modulation techniques for IEEE 802.16 (WiMAX) based OFDM system including BPSK, QPSK, 8PSK and various levels of QAMs. The system performance is gained by dynamically choosing the modulation technique based on the channel conditions. The performance of OFDM system is accessed by using computer simulations performed using MATLAB 7.3. In this paper, transmitter and receiver models are simulated according to the parameters established by the standard, to evaluate the performance. Also, convolution coding is used to improve the system performance. Use of adaptive modulation can effectively control the BER of the transmission, as sub carriers that have a poor Eb/No (db) can be allocated a low modulation scheme such as BPSK. For good Eb/No (db), the high modulation scheme giving priority to spectral efficiency can be considered. Eb/No of the channel is estimated before the transmission. The modulation scheme is set based on the SNR of the channel. General Terms Coding data rate, Interleaving, additive white Gaussian Noise, Bit Error Rate, Adaptive Modulation, channel conditions etc.

Mandeep Singh | Hardeep Kaur

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