Power and Spectral Efficient Multiuser Broadband Wireless Communication System

Abstract

Communication Satellite plays significant role in long distance broadband signal transmission in recent times. Development of an efficient high data rate communication system for multiusers becomes important and challenging. To meet ever-increasing demand for broadband wireless communications, a key issue that should be coped with is the scarcity of power and spectral bandwidth. In the conventional communication scenario, supporting ubiquitous users with high quality data communication services requires huge bandwidth. However, since the spectrum of nowadays is a very costly resource, further bandwidth expansion is impracticable. Thus, the use of efficient multiple access is critical. Moreover, for a given limited bandwidth and limited number of antennas, the only option that can increase data rate is to increase transmit power as suggested by Shannon channel capacity theorem. Therefore, development of power and bandwidth efficient coding, modulation, and multiple-access techniques is essential for the future wireless communication systems implemented through Satellite link. Considering the above issues, this chapter discusses a new communication system for Satellite system that can achieve high power and spectral efficiency in broadband wireless communication. To achieve the goal, development of a new and complete communication system with high user capacity and variable data rate become essential. The system includes multicarrier code division multiple access (MC-CDMA) with peak-to-average power ratio (PAPR) reduction using channel coding, optimization in MC-CDMA, estimation of wireless channel condition and MC-DMA with multi-user detection (MUD). The chapter proposal focuses on different aspects for different part of a communication system, namely PAPR reduction in transmitter, channel estimation for design of adaptive and optimized system, multiuser detection at the receiver for increase in user capacity. The different issues are described under four broad subheadings. Prior to that a brief literature review on the above issues are also presented. The organization of the chapter is as follows: Section 2 presents literature review, while proposed systemmodel is described in Section 3. Design of power and spectral efficient system is described in Section 4. Performance evaluation of the system is presented in Section 5, while conclusions and scope of future works are highlighted in Section 6. 18