Abstract
This paper proposes a hybrid OFDM/TDMA (Orthogonal Frequency Division Multiplexing/Time Division Multiple Access) scheduling method to obtain fine bit-rate granularity in wireless personal area networks (WPANs). A new blind adaptive receiver structure that combats the effects of inter-carrier interference (ICI) caused by users’ frequency offsets is also proposed to improve the system throughput. The proposed blind adaptive receiver is based on constant modulus (CM) criterion and requires no more knowledge of the frequency offsets of interferers’ signals than the conventional receiver. The advantage of our countermeasure is that frequency-guard or redundant data is not needed, thus the throughput performance will not degrade, and estimation of the frequency offset is also no longer necessary. In order to make the adaptive receiver realizable, we develop a soft-constraint-satisfaction (SCS) based algorithm to achieve faster convergence. Simulation results show that our proposal is capable of significantly reducing the influence of ICI.
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