1. An electronic device comprising: a plurality of transmit paths each comprising: a pilot generator configured to receive pilot information and generate pilot sub-symbols based upon the pilot information, the pilot sub-symbols being in a form of a pilot pattern matrix having a dual orthogonality such that each column of the pilot pattern matrix is orthogonal to each column of a pilot pattern matrix generated by pilot generators in each other transmit path, and each column of the pilot pattern matrix is orthogonal to each other column of the pilot pattern matrix in a given one of the plurality of transmit paths, a pilot-subcarrier-coefficient generator coupled to said pilot generator and configured to generate from each pilot sub-symbol a respective complex frequency-domain coefficient for mapping to a respective pilot subcarrier, a data generator configured to receive data information and generate data sub-symbols, and a data-subcarrier-coefficient generator coupled to said data generator and configured to generate, from each data symbol, a respective complex frequency domain coefficient for mapping to a respective data subcarrier.