Single and Cross-Layer MIMO Techniques for IMT-Advanced [Hardcover]

In the last two decades, the wireless arena has witnessed the emergence of an astonishing number of technologies which play a part in the definition of new wireless systems. Driven by the pressing capacity demand, the research community has developed several technological enablers. Fundamental technological building blocks that will be part of wireless systems in the near-future include Orthogonal Frequency Division Multiplexing (OFDM) modulation at the physical (PHY) layer, Multiple Input Multiple Output (MIMO) systems, and a cross-layer (CL) stack design.

While the benefits of OFDM have been recognized for several years, the real capacity improvement of MIMO antennae is still being debated today. As to the last point, even if opportunities for CL have been pointed out for a long time, the impact on the actual legacy systems has not been noticeable as investors are hesitant to implement the inherent design paradigm shift.

Single and Cross-Layer MIMO Techniques for IMT-Advancedpresents some advanced MIMO techniques where adaptivity, cross-layer approach, and MIMO antennae are analyzed together to show a deep impact on the sum-capacity achievable over the wireless link. The introduction presents the functional requirements for IMT-A candidate systems and the relation between IEEE802.16 and LTE wireless access networks. In the first part, adaptive strategies are analyzed separately at the PHY and Medium Access Control (MAC) layers.

The second part presents an evolution of the previous approach, providing a cross-layer MIMO-ARQ protocol where adaptive MIMO schemes, namely Spatial Multiplexing (SM) and STBC Alamouti, are used with ARQ protocol. A Multiple User (MU) network is served in DownLink (DL) with a Round Robin (RR) scheduler; the design is ready to include more advanced schedulers. The ARQ state machine at the MAC layer is aware of per-antenna ARQ. The interaction between the ARQ and the PHY layerlƒ7