Analysis of Flipped Secant Inverse Hyperbolic Pulse-Based FIR Filter for WCDMA

Due to the increasing demand for video signal processing and transmission of high speed and higher order, FIR filters have frequently been applied for performing adaptive pulse shaping and signal equalization on received data in real time. Pulse shaping for wireless communication over time as well as frequency selective channels is the need of the hour for 3G and 4G systems. Due to intensive use of digital filters in video and communication systems, high performance in speed, area and power consumption is demanded. The rapidly increasing popularity of mobile radio services has created a series of technological challenges. One of this is the need for power and spectrally efficient modulation schemes to meet the spectral requirements of mobile communications. Linear modulation methods such as QAM, QPSK, and OQPSK have received much attention due to their inherent high spectral efficiency. However, for the efficient amplification of the transmitted signal, the Radio Frequency Amplifier is normally operated near the saturation region and, therefore, exhibits nonlinear behavior. As a result, significant spectral spreading occurs when a signal with large envelope variations propagates through such an amplifier and creates large envelope fluctuations. Pulse shaping plays a crucial role in spectral shaping in the modern wireless communication to reduce the spectral bandwidth. The present paper deals with an analysis of flipped secant inverse hyperbolic pulse-based FIR filter for WCDMA.