A parallel sampling scheme for multi-carrier communication systems

Broadband communication is demanded to satisfy a much wider variety of multimedia services. Among the multi-carrier schemes proposed in recent years, Orthogonal Frequency Division Multiplexing Access (OFDMA) and Single-carrier Frequency Division Multiple Access (SC-FDMA) are the most appealing candidates for broadband systems. However, traditional sampling scheme with a single high-rate Analog Digital Converters (ADC) are no longer applicable due to the limited sampling speed and extreme large-scale Fast Fourier Transform (FFT). Hence, we propose a parallel sampling scheme with multiple interleaved low-speed ADCs for multi-carrier system. Nevertheless, system performance is sensitive to synchronization precision, as well as the local radio frequency oscillators. Therefore, we investigate the interference caused by timing offset jitter, residual carrier frequency offset and sampling clock jitter in the proposed receiver. Simulation results show that SC-FDMA based system achieve better interference suppression performance over OFDMA based system.