In Section 3, the optimal and suboptimal subcarrier
and power allocation algorithms for three types of detectors are proposed.
OFDMA frame structure with N = 128 subcarriers
Configuration Zero Padding Pilot + Information DC Component Subcarrier
Index 0-27 28-63 64 User 1 28 Subcarriers
User 2 28 Subcarriers
as ZP 1 Subcarrier
Configuration Pilot + Information Zero Padding Subcarrier
Index 65-100 101-127 User 1 36 Subcarriers
as ZP 27 Subcarriers User 2 36 Subcarriers 27 Subcarriers Table 2.
The main idea is to search the unused subcarrier
and then reallocate this to the HUEs.
To show the advantage of the subcarrier
grouping with power distribution using IWFA algorithms, simulations are performed in multi-path environment.
p][k] is the transmitted preamble symbols on the kth subcarrier
BPSK-OFDM is applied to calculate the allocated bit number for each subcarrier
according to LED response model.
The training symbols and pilot subcarriers
are used to correct for the channel response as well as remaining phase drift.
Since 1986, Subcarrier
has specialized in the ownership, development and management of high-capacity telecommunication towers and rooftop sites.
In [10-13], optimal power and subcarrier
allocation is proposed.
1) Discrete multitone modulation/demodulation format: A format that divides data among multiple subcarriers
(carrier waves), and multi-level modulation is used for each subcarrier
to achieve high transmission speeds.
p]) is the noise component at the estimated channel coefficients in frequency domain and ' kp' denotes a subcarrier
index at pth pilot.
Such allocation is particularly the case when distributed subcarrier
assignment is employed.