Table of Contents
What is channel estimation in MIMO-OFDM?
The channel estimation is carried out with conventional Least Square (LS) and Minimum Mean Square (MMSE) estimation algorithms. The performance of MIMO-OFDM system is evaluated on the basis of Bit Error Rate (BER) and Mean Square Error (MSE) level.
What are the benefits of using MIMO with OFDM?
MIMO-OFDM is a particularly powerful combination because MIMO does not attempt to mitigate multipath propagation and OFDM avoids the need for signal equalization. MIMO-OFDM can achieve very high spectral efficiency even when the transmitter does not possess channel state information (CSI).
What is the purpose of channel estimation?
Channel estimation plays an important part in an OFDM system. It is used for increasing the capacity of orthogonal frequency division multiple access (OFDMA) systems by improving the system performance in terms of bit error rate.
Why is channel estimation necessary?
Channel estimation plays an important role in a communication receiver. In order to mitigate hostile channel effects on the received signal, precise channel estimation is required to provide information for further processing of the received signal. Channel estimators can be categorized as non-data-aided or data-aided.
What is channel estimation in digital communication?
Channel estimation is a challenging problem in wireless communications. Transmitted signals are typically reflected and scattered, arriving at the receiver along multiple paths. When these paths have similar delays, they add either constructively or destructively, giving rise to fading.
What do you mean by channel estimation explain with some example?
Channel Estimation is the process of finding correlation between the array of complex numbers on the left and the array of complex numbers on the right. The detailed method of the estimation can very depending on the implementation.
Why do we do channel estimation?
What is MU-MIMO and OFDMA?
OFDMA stands for Orthogonal Frequency Division Multiple Access. MU-MIMO stands for Multi-user multiple-input and multiple-output. Also known as Multi-user MIMO. Both of these multi-user technologies are significant technical enhancements that come with Wi-Fi 6.
What is MIMO technology?
Multiple-Input Multiple-Output (MIMO) is a wireless technology that uses multiple transmitters and receivers to transfer more data at the same time. All wireless products with 802.11n support MIMO. The technology helps allow 802.11n to reach higher speeds than products without 802.11n.
Why is MIMO important?
MIMO is often used for high-bandwidth communications where it’s important to not have interference from microwave or RF systems. For example, it’s frequently used by first responders who can’t always rely on cell networks during a disaster or power outage or when a cell network is overloaded.
What is the advantage of MIMO?
Collectively, these MIMO techniques enable improved signal range, reduced bit errors, lower power consumption, reduced interference and even enhanced non-line-of-sight (NLOS) or quasi-NLOS connectivity.
Why do we require channel estimation in advanced wireless communication?
So, channel estimation is required to compensate for the distortion introduced in the symbols, as they travel through the channel, and to take into account SNR.
What is channel state information in MIMO?
In wireless communications, channel state information (CSI) refers to known channel properties of a communication link. This information describes how a signal propagates from the transmitter to the receiver and represents the combined effect of, for example, scattering, fading, and power decay with distance.
What is OFDM channel?
OFDM is a subset of frequency division multiplexing in which a single channel utilizes multiple sub-carriers on adjacent frequencies. In addition the sub-carriers in an OFDM system are overlapping to maximize spectral efficiency. Ordinarily, overlapping adjacent channels can interfere with one another.
What are the main features of OFDM?
Key features of OFDM
- Multiple carriers (called subcarriers) carry the information stream.
- The subcarriers are orthogonal to each other.
- A guard interval is added to each symbol to minimize the channel delay spread and intersymbol interference.
What is MIMO-OFDM channel estimation?
Multiple-input multiple-output (MIMO) systems can be combined with orthogonal frequency division multiplexing (OFDM) systems to improve the capacity and quality of wireless communications. In this article, a channel estimation technique in both space and frequency domain for MIMO-OFDM systems is proposed.
Why MIMO OFDM thesis projects?
MIMO OFDM Thesis Projects provide knowledgeable environment to upgrade your knowledge also with the aid of our world level certified experts. We provide highly sophisticated research topics in various research areas. MIMO-OFDM is also a modern wireless broadband system which provides wide coverage and reliable communication.
What is MIMO-OFDM system?
MIMO-OFDM system has been currently recognized as one of the most competitive technology for 4G mobile wireless systems. MIMO-OFDM system can compensate for the lacks of MIMO systems and give play to the advantages of OFDM system.
What is an OFDM system?
Orthogonal Frequency division multiplexing (OFDM) Systems are especially suited for channel estimation. The subcarriers are closely spaced.While the system is generally used in high speed applications that are capable of computing channel estimates with minimum delay.