Describe the following terms in wireless communication technologies Equalisation Diversity Channel coding speech coding

Equalisation: In wireless communication technologies, equalisation is a technique used to compensate for the distortion of a signal that is transmitted through a communication channel. This distortion is often caused by various factors such as noise, interference, and signal fading. Equalisation helps in reducing these distortions and improving the quality of the received signal. It is typically performed at the receiver end.

Diversity: Diversity is a technique used in wireless communication to improve the reliability and quality of signal transmission. It involves the use of multiple antennas at the transmitter, receiver, or both to receive multiple independent copies of the same signal. These copies are then combined to form a single, improved signal. The main types of diversity are spatial diversity, frequency diversity, and time diversity.

Channel Coding: Channel coding is a technique used to protect the transmitted data from errors that can occur during transmission. It involves adding extra bits to the data, known as redundancy, which allows the receiver to detect and correct errors. The main types of channel coding include block codes, convolutional codes, and turbo codes.

Speech Coding: Speech coding is a technique used in wireless communication to compress speech signals for transmission. It reduces the amount of data needed to represent the speech signal without significantly degrading the quality of the speech. This is important in wireless communication where bandwidth is often limited. The main types of speech coding include waveform coding, source coding, and hybrid coding.