![]() ISI (Inter Symbol Interference) has been identified as one of the major obstacles to high speed data transmission over mobile radio channels. Channel Coding is used to correct deep fading or spectral null. At the baseband portion of the transmitter, a channel coder maps a digital message sequence in to another specific code sequence containing greater number of bits than original contained in the message. Channel CodingĬhannel coding improves mobile communication link performance by adding redundant data bits in the transmitted message. It is usually employed to reduce the depths and duration of the fades experienced by a receiver in a flat fading channel. ![]() Diversityĭiversity is another technique used to compensate fast fading and is usually implemented using two or more receiving antennas. Such equalizers find their use in frequency selective fading channels. In other words, an equalizer is a filter at the mobile receiver whose impulse response is inverse of the channel impulse response. To resolve this, there are three popular techniques − EqualizerĪn equalizer within a receiver compensates for the average range of expected channel amplitude and delay characteristics. The major cause for this might be the mobile channel impairments. In some cases, there is a scope of performance deterioration, which affects the output.
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