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Due to the involvement of multiple user signals, the uplink of OFDMA systems poses a number of challenges that do not exist in the downlink (DL).
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In general orthogonal frequency-division multiple access (OFDMA) uplink systems, to maintain the orthogonality among multiple users, the signals from all active users should arrive at the base station (BS) synchronously [1].
In the following sections, we extend the analysis in [7 9] to derive the capacity of a UWB PPM and PAM system over indoor fading channels for both single and multiple user environments from a signal-to-noise ratio (SNR) perspective.
However, Quantum has come up with a technology dubbed Dynamic Wavelength Slicing, which can help slice an optical signal among multiple users or types of signals without using any active electronics.
During the recovery process, there is permutation ambiguity, that is, the order of the users may be lost and again the user signals will be recovered up to a scalar multiple.
The user signals are precoded at the base station equipped with multiple antennas to separate the users in the spatial domain.
The turbo receiver is further extended to a multiple user system, where the MAI is estimated in each iteration and subtracted out from the received signal.
The first is multiple user accounts on one device.
Multiple user.
We simulated both the single user and multiple user scenarios.
Multiple user accounts seem to be chronic.
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