A Review on Modulation and channel encoding schemes over IEEE 802.16 Base Networks

computer engg.

The wireless medium has limited bandwidth, higher packet error rate, and higher packet overheads that altogether limit the capacity of the network to offer guaranteed QoS. OFDM systems, also referred as Multi-carrier Systems, are known to be the basis of 3G and 4G technology, for example in LTE (Long Term Evolution) 4G cellular standards, WiMAX Standards, IEEE 802.11 a/g/n Microwave standards, etc. Thus OFDM is a key wireless broadband technology which supports high data rates. Despite of several advantages of this technique, OFDM suffers from a high PAPR which degrades BER performance and results in loss of orthogonality. In this paper, we provide a simulation based evaluation of the cyclic prefixes (Conventional/ Turbo) against various service classes and adaptive QoS modulation schemes that are the key functions in the MAC common part sub layer.

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