Abstract
This chapter focuses on orthogonal frequency division multiple access (OFDMA) wireless communication. OFDMA is the latest technology, and it has been used in the wireless LAN (Wi-Fi) long-term evolution (LTE) and WiMAX systems. LTE is also known as 4G. OFDMA provides optimal spectral efficiency as well as variable bandwidth and provision for many independent channels. This is achieved in a remarkably simple method, using the fast Fourier transform and inverse fast Fourier transform. OFDMA signals are commonly 5, 10, 15, or 20 MHz, which allows wireless carriers to efficiently occupy whatever frequency bands they are licensed to use. Digital predistortion for power amplifier linearization is also introduced.
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