Nec Corporation

Tao Lin

Boon Loong Ng

Thanh Ngoc Bui

Holly He

Thirukkumaran Sivahumaran

Allen Yuan

A method of non-coherent detection of the number of cell-specific transmit antenna ports for a communications device, includes the steps of, at the communications device: (a) generating a downlink reference signals (RS) sequence replica; (b) for a first possible transmit antenna port only, determining a downlink system bandwidth from non-coherent correlation of the generated downlink RS sequence replica and received RS samples; (c) at the determined downlink system, performing a correlation of the generated downlink RS sequence replica and received RS samples for each of a plurality of possible transmit antenna ports; and (d) determining the number of transmit antennas from a comparison of the correlation results in step (c).

Non-coherent detection method of the number of transmit antenna ports for OFDMA

A method for processing a plurality of data streams from a transmitter, includes: receiving symbols via the plurality of data streams; generating a channel matrix; sorting the channel matrix to provide a sorted channel matrix; performing QR decomposition on the sorted channel matrix and a column-row-swapped-sorted-channel matrix; performing QR equalization on a sorted received symbol vector and a swapped received symbol vector to provide a equalized-sorted vector and a equalized-swapped-sorted vector; processing first and second portions of the equalized-sorted vector and the equalized-swapped-sorted vector via a QR-MLD demodulation scheme to determine soft bits and soft symbols; and rearrange soft bits in the above steps to provide an output vector.

Demodulation method for MIMO systems

A method of performing data equalization in a communication receiver with transmit and receive diversity includes (a) for each i-th receiver antenna and j-th transmitter antenna, calculating a channel response matrix Hfrom multi-path channel estimates, (b) each i-th receiver antenna, calculating a channel gain matrix Gfrom the channel response matrices Hand a scalar noise factor &#x3b2;, (c) calculating the middle column cof G, (d) calculating a filter coefficient vector wfrom the middle column cof Gof and the Hermitian transpose Hof the corresponding channel response matrices H, (e) filtering input data rreceived at each i-th receiver antenna with the corresponding filter coefficient vectors w, (f) despreading the filtered input data from each i-th receiver antenna, (g) applying phase compensation to the despread data, and (h) combining the despread data from all antennas to obtain received equalized data.

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Victoria, Australia

Tao Lin