In this paper, we consider the problem of fitting two users into a channel normally occupied by one user. The users share the same physical channel, but crosstalk is controlled. A linear receiver, which maximizes the signal-to-noise ratio (SNR) is employed, and several well known time-limited symbol waveforms are tested. Performance analysis shows that two users can be easily accommodated in a single-user channel with slight degradation of bit error rate (BER), and furthermore, near single-user performance is achievable by properly selecting the symbol waveform. A simple LMS-type algorithm is also discussed for adaptive implementation.
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