Respected Sir ,
We the students of third year are trying to complete our mini project of 8psk transmitter but we are not getting the circuit..
email id :Jaydeepsujgure[at]gmail.com
Phase Shift (PSK) is a digital modulation scheme that transmits data by changing (modulating) the phase of a reference signal (the carrier wave). The modulation is produced by varying the sine and cosine inputs at a precise moment. It is widely used for wireless LAN, RFID and Bluetooth communication. Any digital modulation scheme uses a finite number of distinct signals to represent digital data. PSK uses a finite number of phases, each assigned a unique pattern of binary digits. Normally, each phase encodes an equal number of bits. Each bit pattern forms the symbol represented by the particular phase. The demodulator, which is designed specifically for the symbol set used by the modulator, determines the phase of the received signal and forwards it to the symbol it represents, thus recovering the original data. This requires that the receiver can compare the phase of the received signal with a reference signal, such a system is called coherent (and called CPSK).
The basics of 8-PSK modulation or multi-level PSK modulation which is a type of digital modulation based on the phase change of the carrier.
In Phase Shift, the modulation modulation or PSK modulation phase of the carrier is changed according to the digital data. It is a technique of digital modulation. It is used in video broadcasting systems, aircraft and satellite systems.
We can achieve bandwidth efficiency when we represent each signal element to map more than one bit. In BPSK modulation the digital data of 1 and 0 are represented by a phase change of 180 degrees. In QPSK by phase change of 90 degrees, 2 bits are assigned in each signal. In multi-level PSK, more than 2 bits are assigned using different phase angles. In 8-PSK eight different phase angles are used to represent bits, here 3 bits. The following figure shows the constellation of the 8-PSK signal.
8PSK (8 Phase Shift Keying) is a phase modulation algorithm.
Phase modulation is a frequency modulation version where the phase of the carrier wave is modulated to encode bits of digital information at each phase change.
The "PSK" in 8PSK refers to the use of Phasing Shift Keying. Phasing Shift Keying is a form of phase modulation that is achieved by using a discrete number of states. 8PSK refers to PSK with 8 states. With half that number of states, you will have QPSK. With double states that 8PSK, you will have 16PSK.
Because QPSK has 8 possible states 8PSK is able to encode three bits per symbol.
8PSK is less tolerant to link degradation than QPSK, but provides more data capacity.