Godkända
On Optimal IEEE802.11n Schemes for Maximum Throughput Performance of Four 6x6 MIMO Antenna Configurations in Measured Indoor Office Environments
Meifang Zhu (Ja)
Start
2008-11-04
Presentation
2009-04-28 10:15
Plats:
E:2311
Avslutat:
2009-05-03
Examensrapport:
(Kontakta handledare)
Sammanfattning
In recent years, multiple-input multiple-output (MIMO) communications is attracting more and more interests among consumers, due to the impressive data rates that can be provided in such systems. Due to the need for interoperability between wireless devices in these systems, standardization efforts are required. The first wireless communication standard designed to exploit the potential of MIMO is the wireless local area network (WLAN) IEEE802.11n. This thesis evaluates the throughput performance of 802.11n systems for four 6X6 MIMO antenna configurations in an indoor office environment. The channel measurements used for this purpose were performed for a previous Master thesis project, for both line of sight (LOS) and non-line-of-sight (NLOS) scenarios. The arrays for four transmit-receive configurations are chosen from three types of six-port antenna arrays, i.e., monopole array with sparsely spaced elements, dual-polarized patch arrays with sparsely spaced elements, compact multiport dielectric resonant antenna (DRA) arrays. In order to analyze the throughput performance of the four MIMO antenna configurations based on measured channel data for WLAN applications, a MATLAB-based WLAN simulator is built according to 802.11n draft 5.0. In this simulator, many modulation and coding schemes (MCSs) are included, including low density parity check codes (LDPC), which gain many attentions in recent years and some attractive MIMO schemes such as orthogonal space time block codes (OSTBC) and spatial multiplexing (SM). Based on the simulation results, several analyses were performed. First, the optimal schemes to achieve the maximal throughput by considering the MIMO schemes and MCSs were determined for each antenna array both in the LOS and NLOS scenarios. Then, the way by which the capacity for a given antenna configuration is related to its 802.11n throughput is analyzed. At the last, the relationship between the selection of MIMO schemes and the selection of MCSs was studied, in order to gain an insight into the design of optimal MIMO schemes and MCSs for MIMO systems in general.
Handledare: Buon Kiong Lau (EIT)
Examinator: Ove Edfors (EIT)