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This paper evaluates the link-level performance of millimeter wave (mmWave) wireless communication system operating on 39.5 GHz frequency band. A frame structure based on the long term evolution (LTE) is proposed, including resource allocation and reference signal pattern. Some key parameters are carefully set to adapt to the mmWave frequency. Simulation results validate that the performance of mmWave...
Generalized frequency division multiplexing (GFDM) with the flexible structure is one of the promising candidates for the fifth generation wireless communication system. This paper focuses on training sequence design that is used in the estimation of in-phase(I) and quadrature(Q) imbalance parameters on GFDM receivers as well as frequency selective channel. Combining with the structure of low complexity...
With the severe spectrum shortage in micro-wave frequency bands, millimeter wave (mmWave) frequencies between 30 and 300 GHz have attracted growing attention as a possible candidate for future wireless communication. The relevant transmission technologies for millimeter-wave wireless communication is an opening research. There exist two promising techniques in the physical (PHY) layer design of the...
Because the frequency of millimeter-wave transmissions is extremely high, phase noise (PN) caused by imperfect oscillators greatly degrades transmission performances. Traditionally, for single carrier frequency domain equalization (SC-FDE) with single input and single output (SISO) systems, unique word (UW) structure is widely used as CP as well as training sequences to compensate for PN. However,...
Analog front-ends for wide-band wireless communication systems exhibit frequency-selective inphase and quadrature (I/Q) imbalance due to asymmetry in devices and layouts. This imbalance leads to a significant degradation of the performance in orthogonal frequency division multiplexing (OFDM) systems. In this paper, using a loop-back method, a joint transmitter (TX) and receiver (RX) estimation and...
Interleaving, as an important module of wireless communication system, is used to resist burst errors caused by frequency-selective fading. Low Density Parity Check Code (LDPC) tone mapping would be adopted for Orthogonal Frequency Division Multiplexing (OFDM) systems in IEEE 802.11aj (45GHz). In this paper, an optimal symbol interleaving parameter selecting (OSIPS) algorithm is proposed to get the...
Low-complexity and high-performance multiple-input and multiple-output (MIMO) channel estimation scheme is investigated. Pilot blocks are constructed using quadriphase complementary sequences (QCSs) which enable both one-sided (OSD) and two-sided (TSD) channel estimation (CE). And OSD-CE and TSD-CE are combined to provide improved performance in frequency-selective fast and slow fading channels and...
In this paper, we address the preamble-based channel estimation problem for orthogonal frequency-division multiplexing (OFDM) systems using multiple amplify-and-forward (AF) relays. We first establish a linear minimum mean-square-error (LMMSE) channel estimator which directly estimates the overall channels from the source to the destination. Then, based on the assumption that the channel correlations...
This paper proposes a novel approach to reduce the PAPR value of PCC-OFDM with a new stochastic Hopfield neural network rotator (S-HNN-R) with soft feedback. By adopting new neural output function and random state disturbance, the system performance is improved greatly. Furthermore, the side information isn't needed any more compared to the traditional SLM method. From numerical experiments, it is...
This paper presents approaches of link to system mapping for OFDM/multi-carrier mobile communications systems. Mainly, the effective SINR method is highlighted, which includes EESM and MI-ESM. It is shown how the multi-state channels are integrated into a single state in system simulator with effective SINR approach and why the effective SINR can represent the characteristics of multiple sub-carrier...
This paper presents some evaluation methodologies for a B3G system adopting OFDMA as its multiple access method from system level's point of view. A system level simulator is established to assess the performance of the B3G system based on OFDM or multi-carrier technology. The introduction of these technologies leads to some different simulation methods including channel model, link to system interface,...
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