Mitsubishi Electric Research Laboratories, Inc.

Qinghe Du

Zafer Sahinoglu

Philip Orlik

Jinyun Zhang

Chunjie Duan

Zhifeng Tao

Ghulam Bhatti

Yi Huang

A method allocates bandwidth to channels in an orthogonal frequency division multiple access and time division multiple access (TDMA) network. The network includes a master device (master) communicating with a set of slave devices (slaves). The master defines a set &#x3a8;of logical indices &#x3bd; of a set of N physical subcarriers for a set of M data streams to be allocated to a set of Nlogical data subcarriers according to&#x3a8;=0,1,2, . . . ,&#x2212;1},where d=N/M. The set of N data subcarriers is mapped to the set of Nlogical subcarriers according to the logical indices, and the data subcarriers are allocated to the logical subcarriers.

Carrier allocation and time sharing for OFDMA/TDMA networks

In an oversampled orthogonal frequency-division multiplexing (OFDM) orthogonal network, the preamble used for time synchronization does not have an ideal autocorrelation function due to guard bands, which degrade the accuracy of symbol timing. Therefore, a zero-correlation-zone (ZCZ) based preamble is used for time synchronization. Across correlation function (CCF) used for time synchronization is forced to 0 within a certain region around a main lobe. The length of the ZCZ is guaranteed to be larger than a cyclic prefix length of OFDM data symbols synchronization accuracy.

Zero correlation zone based preamble for oversampled OFDM networks in URWIN

A method and system provide multiple-access control and frequency band allocation, and transmission time sharing among multiple users in orthogonal frequency-division multiple-access (OFDMA) and time-division multiple-access (TDMA) networks. The method can be applied to uplinks and downlinks of multi-user, multi-carrier communication networks. Under a total transmission-power minimization constraint, the method can allocate carriers and transmission time to users optimally, and at the same time, can guarantee a data rate or equivalently a latency requirement of each user.

Joint carrier allocation and time sharing for OFDMA/TDMA networks

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College Station, TX, United States of America

Qinghe Du