Feedback Strategies for Wireless Communication by Berna Özbek & Didier Le Ruyet
Author:Berna Özbek & Didier Le Ruyet
Language: eng
Format: epub
Publisher: Springer New York, New York, NY
5.1 Introduction
Multiple access techniques divide up the total signaling dimensions into channels and then assign these channels to different users. The most common methods to divide up the signal space are along the time, frequency or code axes. The different user channels are then created by an orthogonal division along these axes: Time-division multiple access (TDMA) and frequency-division multiple access (FDMA) are orthogonal channelization methods whereas code-division multiple access (CDMA) can be orthogonal or non-orthogonal, depending on the code design. Multiuser systems refer to transmission system where the resources are shared among multiple users. In multiuser systems, the channel is allocated to the users adaptively by employing different scheduling techniques to achieve multiuser diversity.
This chapter gives background on different transmission techniques according to the knowledge of the users’ channels at the transmitter side and reduced feedback information strategies for multiuser systems. Firstly, an overview of the previous works that are specially derived in information-theoretic view when the users’ channel state information (CSI) are fully known at the transmitter. In Sect. 5.3, user scheduling algorithms are introduced by taking into account different criteria. Then, the reduced and limited feedback algorithms are examined and the performance evaluations are provided for single-carrier and multicarrier-based multiuser systems.
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