An Improved Channel Estimation Technique For Cdd Based Mimo Ofdm System

Abstract

ABSTRACT newlineMultiple Input Multiple Output (MIMO) network transmits data signals at multiple antennas continuously but with single channel. The objective of MIMO network is to improve signal quality and signal energy level strength in RF spectrum. The dataand#8223;s are split into small bits and transmitted across the transmission channel through multiple antennas. The received multiple bit dataand#8223;s combine at the receiver side to form original data. The MIMO receiver section configures to make necessary changes to lost signal and noise interference due to channels. In single input single output network the data goes through losses resulting in minimal signal reception in the receiver side. However, in MIMO networks, the multiple dataand#8223;s are transmitted at multiple antennas increasing data reliability. newline newline newlineIn Single input single output systems requires line of sight antennas for reliable data communication. The signal strength also reduces due to RF signal reflection by surrounding environment. The MIMO networks make use of reflected RF signals from surrounding environment condition to improve signal strength which also increase throughput of data transmitted over the network. The multiple transmission scheme increases transmitted audio and video quality. The MIMO network comprises of different antenna configuration such as newline2x2, 3x3, 4x4 and 8x8 networks. More data can be transmitted at the same time with different antenna configuration which increase data link. MIMO networks comprises of dipole antenna, Multi-antenna with single radome which has RF connectors to mount different types of antenna. newline newline newline newlineThe antenna scheme increases RF diversity without increasing the size of antenna. newline newline newlineIn MIMO system channel estimation and bit error rate play a key role in increasing performance and data reliability of MIMO system. Conventional methods employ pilot based scheme for channel estimation which reduces data transmission rate, spectral efficiency of MIMO systems and provides less noise suppression. To eliminat