Impact of spatial expansion on channel estimation accuracy in HT and VHT wireless LAN systems

Author

Ismail, Syed Zeeshan ; Chavali, Nanda Kishore

Author_Institution

Signal Process. Group, Uurmi Syst. Pvt Ltd., Hyderabad, India

fYear

2013

Firstpage

643

Lastpage

648

Abstract

The IEEE 802.11n is a high throughput (HT) wireless LAN standard that supports multiple input, multiple output orthogonal frequency division multiplexing (MIMO-OFDM) technology with maximum of 4 transmitting and 4 receiving antennas. This technology has been extended to 8 transmitting and 8 receiving antennas in upcoming very high throughput (VHT) wireless LAN standard, IEEE 802.11ac. Spatial expansion (SE) is a transmit diversity scheme used to map fewer space time streams to more transmit antennas to obtain spatial diversity. One of the key tasks at the receiver in such MIMO-OFDM systems is the channel estimation. We discuss a technique to improve the accuracy of channel estimation and the impact of SE on it. We compare the performance of the improved channel estimation technique with different antenna configurations of SE using simulations.

Keywords

IEEE standards; MIMO communication; OFDM modulation; channel estimation; diversity reception; receiving antennas; telecommunication standards; transmitting antennas; wireless LAN; IEEE 802.11ac standard; IEEE 802.11n standard; MIMO-OFDM systems; MIMO-OFDM technology; SE; VHT wireless LAN standard; antenna configurations; channel estimation; multiple input multiple output orthogonal frequency division multiplexing; receiving antennas; space time streams; spatial diversity; spatial expansion; transmit diversity scheme; transmitting antennas; very high throughput wireless LAN standard; Channel estimation; Channel models; Receiving antennas; Transmitting antennas; Wireless LAN; IEEE 802.11ac; MIMO; OFDM; Spatial expansion; TGac channels; channel estimation;

fLanguage

English

Publisher

ieee

Conference_Titel

Advances in Computing, Communications and Informatics (ICACCI), 2013 International Conference on

Conference_Location

Mysore

Print_ISBN

978-1-4799-2432-5

Type

conf

DOI

10.1109/ICACCI.2013.6637248

Filename

6637248