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In this paper, a layered preamble denoted as LP1 is proposed based on Layer Division Multiplex (LDM). The preamble is composed of two OFDM symbols. The first symbol is fixed and used for timing and frequency synchronization. The second symbol is a combination of two layers which both convey system parameters associated with system structure. Because of good cross-correlation of PN sequences with different...
Time domain synchronous orthogonal frequency division multiplexing (TDS-OFDM) modulation scheme offers higher spectrum efficiency than that by cyclic prefix (CP) OFDM technique, but at the same time it increases computational complexity on the receiver side. And under time-varying channel conditions, residual inter-symbol-interference (ISI) due to imperfect channel estimation causes performance loss...
Amplitude phase shift keying (APSK) constellation with gray mapping proposed in [2] provides considerable shaping gain compared with quadrature amplitude modulation (QAM). In this paper, some improvements to APSK Constellation with gray mapping are addressed. AP-SK constellation with gray mapping could be adjusted according to different SNR levels to increase its average mutual information (AMI)....
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