The prime objectives in the development of Next Generation Wireless Communication systems are to increase the link throughput and network capacity. These demands translate into designing systems that have improved spectral efficiency, efficient bandwidth utilization, computationally economical signal processing algorithms and high speed processing hardware. The available frequency spectrum is limited and a very scarce resource. Hence, efficient channel utilization techniques are required to exploit the channel conditions more proficiently. MIMO technology has become popular in wireless communication systems to achieve enhanced spectral efficiency in rich scattering environments. Test-beds are requisite to validate the results of theory and simulations. The focal benefit of a test-bed is the leeway to study and compare different synchronization, channel estimation and detection algorithms in realistic environments. One of the aspirations of this research work is to achieve real-time video transmission over Next Generation Wireless Systems employing MIMO transmission which enables enhanced data rates utilizing the same frequency band.

Advances in wireless communication have enabled mobility of personal computing devices equipped with sensing and computing capabilities. This has motivated the development of location-based services (LBS) that are implemented on top of existing communication infrastructures to cater for changing user contexts. To enable and support the delivery of LBS, accurate, reliable and real time user location information is needed. This book introduces localization system for tracking the position of mobile node, using received signal strength (RSS) in Wireless Local Area Networks (WLAN).The main challenge in WLAN positioning is the unpredictable nature of the RSS-position relationship. Existing system relies on a set of training samples, collected at a set of test points with known positions in the environment to characterize this relationship.

The new generation of wireless devices support higher data rates. Most of the new standards like HSPA utilize the spatial multiplexing of MIMO channels to achieve higher data rates, and exploit the diversity of MIMO channels to provide better performance. Hence there is an increased interest in the analysis of MIMO communication systems. The eventual objective is to achieve higher data rates in MIMO systems under the constraints of limited bandwidth and power. The radio spectrum is a scarce resource, and very expensive to license. Hence improved and efficient channel utilization techniques are requisite, that exploit the radio spectrum more proficiently. The multipath characteristics of the environment cause the MIMO channels to be frequency selective. For frequency selective deep fading, MIMO system remains ineffective. OFDM, a multicarrier transmission scheme, is well recognized for its potential for attaining high rate transmission over frequency selective channels. It can transform such a frequency selective MIMO channel into a set of parallel frequency-flat channels. Implementing space resources based on OFDM i.e., MIMO-OFDM provides higher data rate.

Over last few years use of wireless broadband has increased rapidly. There are two types of wireless broadband users, fixed and mobile. WiMAX is a new technology in 3G systems (near to 4G) and has support for wireless broadband users, both fixed and mobile. For fixed users (Mainly Office and Home) dis-connectivity in the connection is intolerable. Such users are needed to be allocated permanent channels, so they never face dis-connectivity due to unavailability of channels in the cell. This book provides analysis on channel allocation schemes, namely Non Prioritized Scheme (NPS) and Reserved Channel Scheme (RCS) in WiMAX scenario, in context of permanent channel allocation. These schemes were previously used for those cellular networks which had no need for permanent channel allocation in the cell. We have performed simulations on these schemes in MATLAB and have compared their results in terms of Blocking Probability (Pb), Probability of handover failure (Ph), Probability of forced termination (Pft) and Probability of not completed calls (Pnc). The analysis carried in this book should help professionals currently working for advancement of WiMAX cellular networks.