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By applying probabilistic scheduling, a proportion 1−ω of idle timeslots are allocated to transmit new packets.
Conventionally, the power is allocated to transmit antennas based on the sum power constraint at the transmitter.
Thus, ϕ∈[0,1] represents the ratio of the total transmission power p allocated to transmit the information-bearing signal s i.
This means that, as Tx3 allocates more power to relay m1, m2 by increasing ρ1 = ρ2, R1 and R2 improve, while R3 degrades due to the less power allocated to transmit m3.
First, when the n th user is added up, n - 1 users that are already selected should be allocated to transmit power equal to or less than the value for the case when only n - 1 users are selected, owing to the assumption of transmit power in Section 2.
Similar(55)
Figure showing optimum value of power to be allocated to transmitting antenna i=1,2,….
where γ i opt is the optimum value of power to be allocated to transmitting antenna i, μ is a constant, N0 is the noise power, and (x)+ is defined as: x + = x, if x ≥ 0, 0, if x < 0. (4).
If the same transmit power is allocated to all transmit channels, i.e., p 1 j = ⋯ = p Mj = p j Σ, the above Lemma result reduces to the case of[9, 12].
Note that the power levels for different channels here are distinct as opposed to[9, 12] where the same transmit power was allocated to all transmit antennas in the MIMO setting.
In this context, OBF is introduced [7]: by varying the powers and phases allocated to the transmit antennas, a beam is randomly swept and at any time transmission is scheduled to the user currently closest to the beam.
If the same number of data subcarriers is allocated to all transmit antennas, the OFDM symbols in all antennas experience the same distortion characteristics (cf. (3) to (5)).
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com