The HGBBDSA is accomplished the subcarrier
allocation improving task that distributed inside the HeNBs and the adjacent HeNBs, by allotting the subchannel to HUE in LTE-A HetNet.
group assignment for MC-CDMA wireless networks", EURASIP Journal on Wireless Communications and Networking.
According to the central limit theorem and if the number of subcarriers
N is large enough, the real and imaginary parts of the time domain signal samples follow the Gaussian distribution function with zero mean and variance 1/2.
PC sequence on each subcarrier
with a good periodic ACF can improve the AF performance; this also has been shown in .
Figure 9 plots the result for the case of the N = 64 subcarriers
and 16 QAM modulation with and without the dummy symbol insertion wherein the dummy symbol is selected to be any of the 16 possible points in the constellation diagram.
The coefficients of the minimum mean square error(MMSE-) frequency domain equalization (FDE) for the kth subcarrier
, W[fc], are given by
The short training symbols are followed by a long training symbol which contains 52 QPSK modulated subcarriers
like a normal data symbol.
Current AC Site Management customers will continue to be served by Subcarrier
's office in Houston, Texas.
However, the large usage of additional subcarriers
for the dummy sequences can directly cause the reduction of transmission efficiency.
In the demodulation process, based on the orthogonality between the subcarriers
, the result for the lth subcarrier
for the rth block (assuming 0 [less than or equal to] l [less than or equal to]N - 1) is as follows:
Moreover, SU can access the ith subcarrier
, where [g.sup.pp.sub.i,j], [g.sup.ss.sub.i,j], [g.sup.sp.sub.i,j], and [g.sup.ps.sub.i,j], denote the channel power gain of the primary link, the secondary link, the link between SU-Tx and PU-Rx and the link between PU-Tx and SU-Rx in the jth small cell.