The proposed scheme could not only improve the performance of the system but also average the signal-to-noise ratio SNR of subcarriers and reduce the difference among subchannels in practical application. The simulation results showed that compared with the traditional scheme, the receiver performance of this scheme was improved by 2. Besides, the constellation distribution was more convergent and uniform. MB-OFDM UWB signal is widely used in access networks due to its notable advantages such as low power consumption, high bandwidth, and antielectromagnetic interference [ 1 — 3 ]. It is precisely because of the rapid development of broadband communication and network technology that the communication demand has developed from simple voice services to higher-demand broadband services such as data and high-definition video transmission. Recently, the proposal of OCT-precoding scheme has improved the error code performance and equalized the signal-to-noise ratio of each data subcarrier in the signal [ 7 — 9 ].
OCT-Precoding Combined with LDPC-Coding Scheme for 128 QAM MB-OFDM UWBoF System
MB-OFDM Modulation Overview (MB-OFDM)
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Improved Training Sequence Channel Estimation Scheme in 16QAM MB-OFDM UWBoF System
This topic describes a Multiband-Orthogonal Frequency Division Multiplex MB- OFDM Orthogonal Frequency Division Multiplexing: OFDM employs multiple overlapping radio frequency carriers, each operating at a carefully chosen frequency that is Orthogonal to the others, to produce a transmission scheme that supports higher bit rates due to parallel channel operation. To allow for such a large signal bandwidth, there are power restrictions which prevent MB-OFDM devices from disturbing narrower band devices nearby, such as Band Group and Band Frequencies. A hopping sequence always consists of six hops between Bands but within a single Band Group. For example, Band Group 1, and hops of Bands
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