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In this paper, we assume that the transmitter is sending a binary sequence of codewords and using a binary phase shift keying (BPSK) modulation, i.e. let +1 and −1 be the modulated symbols of 0 and 1.
where s(k) denotes modulated symbols of the control information.
Let s g ( k ) = [ s 1, g ( k ), s 2, g ( k ), …, s N k, g ( k ) ] T be the modulated symbols of the k th user in the g th block.
The baseband modulated symbols of user k are spread with a flock of element codes represented as Fig. 1 Block diagram of MC CC-CDMA system using parallel interference cancellation {C}^{ k)} = {left[{C}_1^{ k)}, kern1em {C}_2^{(k)}, dots {C}_N^{ k)}right]}^T, (1 where k = 1,2,…,K, and n = 1,2,…,N.
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During the next time slot, the modulated symbol of XOR version will then be transmitted.
∀k l ∈Θ, where (x_{i,k_{l}}) being the corresponding modulated symbol of (c_{i,k_{l}}).
In order to adapt the data transmission to the current channel state, LTE-A applies limited feedback; a comprehensive specification follows in Section 4. Limited feedback is depicted via the feedback arrow in Fig. 2. The data vector (boldsymbol {x}^{(l)} in mathbb {C}^{N_{text {SC}}times 1}) of layer l∈{1,…,L} contains modulated symbols for each of the N SC subcarriers.
This block prepares the modulated symbols for the frame generation in the frequency domain.
Note that the modulation and demodulation of NeMo operate at the level of modulated symbols (called "modulation over modulation") and thus it can be independent from network layer.
While the acquisition of the modulated symbol for each transmit antenna needs 2 real multiplications and 2 real additions, respectively.
Built on algebraic number theory, NeMo operates at the level of modulated symbols (so-called "modulation over modulation").
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