The person said that AT&T's board was less enthusiastic about a potential combination of the wireless communications divisions at AT&T and British Telecommunications but that such a deal had not been ruled out.
In wireless communications, orthogonal frequency division multiplexing (OFDM) is a well-known solution for overcoming the problem of multipath fading channels [1, 2].
As one of the most popular technologies for wireless communications, orthogonal frequency division multiplexing (OFDM) [1], on the one hand, has attractive advantages such as high spectrum efficiency, robustness to multi-path fading and efficient implementation based on fast Fourier transform, which make it suitable for wide-band wireless communications.
DOA estimation is currently one of the important issues in next generation wireless communications, namely the space division multiple access (SDMA).
To this end, three schemes have achieved notable importance in the standardisation of modern wireless communications systems, namely, spatial division multiplexing (SDM), space-time block coding (STBC) and cyclic delay diversity (CDD).
In wireless communications, multicarrier direct-sequence code-division multiple access (MC DS-CDMA) constitutes one of the highly flexible multiple access schemes.
Besides the well-known time, frequency and code divisions in wireless communications, spatial separation has been recently recognized as a new signal dimension for further system performance enhancement, especially in multiuser (MU) transmissions.
Others are Nadir Mohamed, 52, president and chief operating officer of the communications division, which includes wireless; and William W. Linton, chief financial officer.
Recently, wireless communications have been developing very rapidly from code division multiple access to orthogonal frequency division multiple access (OFDMA) techniques [1 3].
The problem of identifying multiple-input multiple-output (MIMO) systems arises naturally in spatial division multiple access architectures for wireless communications.
