SC-FDMA with Adaptive Modulation using PN-Sequence and STBC Code

Wireless communication is also referred to as the future trends that are used to communicate between transmitter and receiver. Modulation has been done once signal is generated in each multiple sub carriers to send it over the channel. OFDM, SCFDMA and other modulation schemes are being used and reviewed. OFDM is a method that uses multiple sub-carriers to transfer the data through the channel. The data is being transferred over several or different channels. The carriers of the channels are orthogonal or independent to the signals. To achieve it, carrier must be placed exactly at the nulls modulation spectra of adjacent signals. SCDMA use the STBC codes to solve the problem of ICI. STBC stands for Space Time Block Coding. STBC is used to transfer the multiple copies of data to more than one antenna. It is used in Wireless communication for achieving the transferred data at more than one receiver’s end. In the proposed system modulation of the signal is performed, addition of Cyclic prefix has been done to obtain high performance data transform and use bandwidth efficiently. Proposed method evaluates STBC code to send single data to multiple routes for the quality enhancement of the signal. Transmission has been done between the receiver and the transmitter where each side involves separately performing their operations. As in the existing system FFT block was not included due to which signal has been distort whereas in the proposed system this DFT block is added before the IDFT block that will help to retain the signal quality. Comparison has been performed through taking signal and performance is evaluated in this thesis to check the efficiency of individual approach.