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Although Orthogonal Frequency Division Multiplexing (OFDM) technology has been widely used in LTE and other systems, the problem of large band leakage caused by the Doppler effect restricts the further improvement of performance when the user moves at high speed. The Filter bank based multi-carrier (FBMC) technology is one of the effective techniques which could replace OFDM in 5G communication systems...
Inter-carrier interference (ICI) caused by time-variant multi-path channels degrades the performance of orthogonal frequency division multiplexing (OFDM) based digital terrestrial television broadcasting systems, especially for large number of sub-carriers and high speed mobile reception. In this paper, we propose an minimum mean square error (MMSE) based equalization and ICI mitigation scheme for...
The digital television terrestrial broadcasting (DTTB) system is a promising candidate for positioning due to the high power level and wide coverage of DTTB signals. This paper proposes a positioning scheme for Chinese DTTB system whose key technology is time domain synchronous OFDM (TDS-OFDM). The transmission parameter signaling (TPS) embedded in TDS-OFDM signals are firstly regarded as pilots,...
In view of the new feature after introducing the relay nodes (RNs) into the conventional cellular networks, a novel soft frequency reuse (SFR)-based inter-cell interference coordination (ICIC) scheme is proposed in the relay enhanced cellular networks. On the basis of original ICIC scheme for conventional cellular network, RNs in the proposed SFR scheme reuses part of neighboring cell-edge bands to...
Compared with the global positioning system (GPS), the digital television (DTV) broadcasting signal is a promising candidate for position location due to low implementation cost and strong signal reception. Without changing the current infrastructure of the Chinese DTV broadcasting network, this paper proposes a novel positioning scheme using the multi-carrier pseudo-noise (PN-MC) training sequence...
To improve the system capacity of conventional orthogonal frequency division multiplexing (OFDM) systems, the layered modulation OFDM scheme is proposed. The modulated OFDM symbols are separated into two layers as differential modulated symbols and coherent symbols. The differential symbols are used as pilots, which are combined with the coherent modulated data and sent out by the transmitter. At...
In this paper, a simple and effective synchronization scheme for NC-OFDM systems is proposed. To keep the autocorrelation in the scenario of subcarriers deficiency, the preamble is consists of two identical pseudo-noise (PN) sequences instead of ZC sequences. Coarse timing estimation and fractional CFO(carrier frequency offset) estimation are completed according to the correlation between the received...
Cognitive radio has been seen as a promising technique to address the frequency resource scarcity problem. It is a key issue to reliably detect the activity of primary users' (PUs) for cognitive radio users. As orthogonal frequency division multiplexing (OFDM) has becoming a popular technique for modern wireless communications systems. It is necessary to identify the existence and estimate the key...
This paper investigates the sidelobe suppression techniques of orthogonal frequency division multiplexing (OFDM) based cognitive radio (CR) systems. We firstly argue that the existing sidelobe suppression algorithms cannot satisfy the special requirements of CR systems. Then we formulate the interference suppression problem of CR systems into two algorithms from capacity perspective, namely, average...
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