On the Design and Performance Analysis of Low-Correlation Compact Space-Multimode Diversity Stacked Microstrip Antenna Arrays for MIMO-OFDM WLANs over Statistically-Clustered Indoor Radio Channels

A Savaşcıhabeş,E Yazgan,O Ertuğ

doi:10.13164/re.2015.0054

Abstract

The support of high spectral efficiency MIMO spatial-multiplexing communication in OFDM-based WLAN systems conforming to IEEE 802.11n standard requires the design and use of compact antennas and arrays with low correlation ports. For this purpose, compact space-multimode diversity provisioning stacked circular multimode microstrip patch antenna arrays (SCP-ULA) are proposed in this paper and their performance in terms of spatial and modal correlations, ergodic spectral efficiencies as well as compactness with respect to antenna arrays formed of vertically-oriented center-fed dipole elements (DP-ULA) and dominant- mode operating circular microstrip patch antennas (CP- ULA) are presented. The lower spatial and modal correlations and the consequent higher spectral efficiency of SCP-ULA with ML detection over statistically-clustered Kronecker-based spatially- correlated NLOS Ricean fading channels with respect to DP-ULA and CP-ULA at significantly lower antenna and array sizes represents SCP-ULA as a promising solution for deployment in terminals, modems and access points of next-generation high-speed 802.11n MIMO-OFDM WLAN systems .

Highlights

In the concurrent and next-generation communication systems, the spectral efficiency and transmission quality can be vastly enhanced by multiple-input multiple-output (MIMO) communication techniques [1]
When regularly spaced antenna elements are used in MIMO systems, the correlation between the antenna elements in a space diversity system and the channel capacity and transmission quality are dependent on the distance between antenna array elements, the number of antenna elements and the array geometry
A multimode stacked circular microstrip patch antenna used in a uniform linear array structure (SCP-ULA) for MIMO-OFDM wireless local area network (WLAN) systems conforming to IEEE 802.11n standard is designed and the associated spatial power correlation, ergodic spectral efficiency and compactness with respect to omnidirectional dipole (DP-ULA) and circular microstrip uniform linear arrays (CP-ULA) operating in the dominant isotropic TM01 mode are analyzed

Summary

Introduction

In the concurrent and next-generation communication systems, the spectral efficiency and transmission quality can be vastly enhanced by multiple-input multiple-output (MIMO) communication techniques [1]. A multimode stacked circular microstrip patch antenna used in a uniform linear array structure (SCP-ULA) for MIMO-OFDM WLAN systems conforming to IEEE 802.11n standard is designed and the associated spatial power correlation, ergodic spectral efficiency and compactness with respect to omnidirectional dipole (DP-ULA) and circular microstrip uniform linear arrays (CP-ULA) operating in the dominant isotropic TM01 mode are analyzed. The wireless local area network (WLAN) technology for medium-range indoor/outdoor wireless communications standardized by IEEE P802.11 working group has emerged from pre-802.11 standards towards spectrally-efficient and multipath-robust OFDM modulation based 802.11b and 802.11a/g with data rates increasing up to a maximum of 54 Mbps for 802.11a/g These standards are limited to the use of single transmit and receive antenna at the access points and modems as well as laptops/PDAs in WLANs for end-users forming a SISO-OFDM (single-input singleoutput OFDM) channel.

Rx l l r

Xin jw h

RX w matrix

Conclusions