where M V is the spreading factor for voice codes and θ is the orthogonality factor [19].
where N is the spreading factor and h j [ n] represents the effective channel IR of the j th user.
The Y k (t) signals are sampled at the chip period T c = T s /I, where I is the spreading factor.
We will perform the product of every N chips' likelihood probability on this node to complete the accumulation of the despreading after multiplied by each user's spreading sequence, where N is the spreading factor.
where is the number of served users, is the number of transmitted QAM symbols per user during the considered time interval, and is the spreading factor which is assumed to be identical for all users.
where T c is the chip duration, SF = T/T c is the spreading factor, u q = ±1 is the chip number q and w(t) is the rectangular pulse of duration T c.
where is the th user's signal energy per symbol, is the symbol duration, are the th user's symbol data,,, and (2). is the spreading waveform obtained with the Walsh-Hadamard matrix, is the spreading factor, is the chip duration, and is the impulse response of the pulse shaping filter.
The interleaved codewords are segmented into groups of (Nnt - Np) × m bits, where N is the spreading factor of the precoder, nt is the number of transmit antennas, Np is the number of pilot symbols in Nnt precoded symbols and m is the number of bits carried by one symbol of a QAM constellation whose size is |Ω| = 2 m.
L is the Rake receiver branch number, g is the spreading factor, I 0 is the total noise power spectral density (including multiple access interference, thermal noise, and multipath fading), For a cell with K users where the channel energy of each user is normalized to 1 E A iL ( k ) 2 = 1, the channel model (3) becomes: y i ( k ) = A iL ( k ) x i ( k ) + I 0 2 b i ( k ) A iL ( k ), (4).
where M D is the spreading factor for data codes, (tilde {textbf {p}} triangleq {tilde {p}_{ji},, jin mathcal {U}_{D}, iin mathcal {B}}) and (tilde {textbf {n}}triangleq {tilde {n}_{ji},, jin mathcal {U}_{D}, iin mathcal {B}}) are the power and code allocation variables (random variables), and where we have assumed that the same power is allocated to all the codes of the same user.
