Abstract
This chapter explores high data rates in mobile communication. One target of 3G mobile communication is to provide the possibility for significantly higher end-user data rates compared to what is achievable with the first releases of the 3G standards. The chapter discusses some of the fundamental constraints that exist in terms of what data rates can actually be achieved in different scenarios. It considers different scenarios including noise-limited and interference-limited scenarios.The chapter emphasizes that providing data rates larger than the available bandwidth is fundamentally inefficient. A straightforward means to provide higher data rates within a given transmission bandwidth is the use of higher-order modulation, implying that the modulation alphabet is extended to include additional signaling alternatives and thus allowing for more bits of information to be communicated per modulation symbol. The chapter examines different means to increase the achievable data rates in different mobile-communication scenarios. Wider bandwidth including multi-carrier transmission and its advantages are also described.
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