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This paper considers a $K$-cell multiple access channel with inter-symbolinterference. The primary finding of this paper is that, without instantaneouschannel state information at the transmitters (CSIT), the sumdegrees-of-freedom (DoF) of the considered channel is $\frac{\beta -1}{\beta}K$with $\beta \geq 2$ when the number of users per cell is sufficiently large,where $\beta$ is the ratio of the maximum channel-impulse-response (CIR) lengthof desired links to that of interfering links in each cell. Our finding impliesthat even without instantaneous CSIT, \textit{interference-free DoF per cell}is achievable as $\beta$ approaches infinity with a sufficiently large numberof users per cell. This achievability is shown by a blind interferencemanagement method that exploits the relativity in delay spreads between desiredand interfering links. In this method, all inter-cell-interference signals arealigned to the same direction by using a discrete-Fourier-transform-basedprecoding with cyclic prefix that only depends on the number of CIR taps. Usingthis method, we also characterize the achievable sum rate of the consideredchannel, in a closed-form expression.

Degrees of Freedom and Achievable Rate of Wide-Band Multi-cell Multiple Access Channels With No CSIT