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Book Chapter•DOI•

Design and Analysis of DVMCK Transmission System

01 Jan 2014-pp 667-676
TL;DR: The final demodulation data stream of the VMCK transmission system shows the excellent performance in the simulation and has strong properties to resist synchronization error.
Abstract: Differential very minimum chirp keying (DVMCK) as a novel high bandwidth efficiency modulation scheme is proposed. The DVMCK transmission system model is elaborated based on Simulink within MATLAB. The absolute code is converted to differential code for carrying out very minimum chirp keying (VMCK) modulation. The demodulation result is obtained by comparing with a pre-defined threshold. The final demodulation data stream of the VMCK transmission system shows the excellent performance in the simulation. The DVMCK transmission model is easy to implement and has strong properties to resist synchronization error.
References
More filters
Journal Article•DOI•
TL;DR: This paper explains how this is accomplished and gives a full mathematical analysis of the method and explains how up to 15 bits/sec/Hz are now being achieved in usable hardware with C/N ratios better than that obtainable using FM, BPSK or QPSK.
Abstract: Bandwidth efficiencies that have not been possible in the past are now being achieved using variable PSK (VPSK) and variable MSK (VMSK) modulation without the loss of signal power that normally accompanies high bandwidth efficiency methods. Theoretically, these two methods do not lose any signal energy with increasing bandwidth compression. Efficiencies up to 15 bits/sec/Hz are now being achieved in usable hardware with C/N ratios better than that obtainable using FM, BPSK or QPSK. This paper explains how this is accomplished and gives a full mathematical analysis of the method. FM-SCA, VSAT, STL and RPU equipment are now undergoing beta testing prior to FCC Type Acceptance submission. Installation is expected on a large network during 1997.

54 citations

Journal Article•DOI•
TL;DR: In this article, the performance characteristics of the capacitive slot, or a slot placed between the feed and ground connections, in a planar inverted-F antenna (PIFA) are comprehensively analyzed.
Abstract: The performance characteristics of the capacitive slot, or a slot placed between the feed and ground connections, in a planar inverted-F antenna (PIFA) are comprehensively analyzed. The PIFA capacitive slot behavior is measured inside a two antenna system within a mobile phone where the first antenna is a multiple band PIFA and the second antenna is a higher frequency band PIFA directly overlapping with the first antenna higher frequency band. The dual band PIFA in this paper is designed to be resonant in the quad-band GSM+3G/4G, and the second PIFA is resonant in the 3G/4G frequency bands. The capacitive slot has three types of behaviors: affect the matching of existing frequency resonances, induce another frequency resonance, and improve the isolation between the two antennas. Together with optimal antenna ground and feed placement, the capacitive slot can act as a notched bandstop filter to decrease the S21 mutual coupling between the two antennas by over 20 dB and decrease the envelope correlation by almost one order of magnitude.

25 citations

Journal Article•DOI•
TL;DR: The paper shows that the special impacting filter satisfies the above assumption, therefore, in the frame of binary detection theory, the excellent performance of high-efficiency EBPSK system can be explained and the correction of the theoretical BER formula can be validated.
Abstract: The extended binary phase shift keying (EBPSK) transmission system with ultra narrow bandwidth has excellent BER performance, which raises many doubts with the researchers. Therefore, on the premise of the existence of a special filter that can transform the modulated phase information into amplitude information, the theoretical BER formula of EBPSK system in Additive White Gaussian Noise (AWGN) channel has been deduced. This paper gives the theoretical values of the parameters in the above BER formula and discusses the effects of parameters on BER firstly. Then the paper shows that the special impacting filter satisfies the above assumption, therefore, in the frame of binary detection theory, the excellent performance of high-efficiency EBPSK system can be explained and the correction of the theoretical BER formula can be validated.

25 citations

Journal Article•DOI•
Wook Bong Lee1, Inkyu Lee1, Jin Sam Kwak2, Binchul Ihm2, Shuangfeng Han3 •
TL;DR: Closed-loop multicell MIMO techniques adopted in IEEE 802.16m are introduced, which do not require data forwarding among different base stations, and the overall operations which minimize overhead are explained.
Abstract: Various multiple-input multiple-output techniques have been introduced to improve performance of next-generation systems. In single-cell environments, closed-loop MIMO schemes increase the system capacity as well as cell coverage. In cellular networks where interference coming from other cells is usually a dominant factor, several multiple-base-station cooperation schemes have been introduced to mitigate the intercell interference. In this article, we first provide an overview of scenarios and technology categories for multi-BS MIMO cooperation schemes. Next we introduce closed-loop multicell MIMO techniques adopted in IEEE 802.16m, which do not require data forwarding among different base stations. In particular, this article explains the overall operations which minimize overhead. We also present simulation results that confirm the efficiency of the presented interference mitigation method.

24 citations

Journal Article•DOI•
Man Feng1, Lenan Wu1, Peng Gao1•
TL;DR: A novel but simple digital impacting filter produced by exploiting the mechanism of zero group delay crystal filters, which can cooperate with the usual small-angle modulation of UNB modulation, especially with Extended Binary Phase Shift Keying (EBPSK) modulation.

23 citations