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In this paper, a vertical physical-layer network coding (VPNC) scheme based pulse amplitude modulation (PAM) for two-way relay channel (TWRC) is proposed. Different from the conventional physical layer network coding (PNC) scheme in which the relay superimposes two users' signals of the same constellation, in the proposed VPNC scheme two users transmit PAM signals with vertical constellation and the...
This paper proposes a rate adaptation strategy based on Spinal codes, a novel rateless codes, in truncated incremental redundancy hybrid ARQ (HARQ) transmission. The information transmission between Satellite or deep space probes and ground receivers is considered. Too many retransmissions, which are caused by error frame, and long distance lead to considerable delay, up to several seconds. The delay...
In this paper, a hierarchical modulation scheme is applied to IEEE 802.11n to reach the purpose of unequal error protection (UEP). A simplified method of data partition is proposed for intra- and inter-predicted videos which are encoded by H.264/AVC. Simulation results show that the PSNR of compressed video can be improved through this hierarchical modulation scheme by about 4 ~ 8 dB on both AWGN...
The noise-coupling technique is introduced into the design of incremental ΣΔ ADCs using extended counting. A reduced number of integrators and hence lower power dissipation can thus be achieved. To demonstrate the proposed idea, a second-order noise-coupled incremental ΣΔ modulator with extended counting structure was designed and simulated.
In this paper, a general solution is proposed for the excess feedback loop delay issue for a discrete-time ΔΣ ADC. The corresponding low-distortion technique is also illustrated. Finally, the double-sampling ΔΣ ADC immune to the extra loop delay is described and verified through simulation.
A direct-charge-transfer adder is described for wideband low-power delta-sigma ADCs. Its operation and design are discussed in detail. Its application to noise-coupled delta-sigma ADCs is also described. To verify the proposed design methodology, a 2nd order noise-coupled delta-sigma ADC using direct-charge-transfer adder has been designed and simulated.
This paper proposes a new delay cell for noise-coupled delta-sigma analog-to-digital converters, which simplifies the design of noise-coupling circuits, as well as of the clock generator. Next, a second-order noise-shaping enhancement technique is introduced, and its architecture and circuit implementation discussed. To verify the proposed design methodology, a noise-coupled ADC was designed and simulated.
The noise-coupling technique successfully used in discrete-time delta-sigma ADCs is extended to the realization of continuous-time delta-sigma ADCs, resulting in improved quantization noise shaping. The operation and design of these circuits is discussed in detail. To verify the proposed design methodology, a second-order continuous-time delta-sigma modulator with noise coupling was designed and simulated.
A new dynamically-biased scheme is proposed to implement a 13-bit delta-sigma modulator with a 2.5 MHz signal bandwidth. It uses the low-distortion architecture, and hence the opamp linearity requirements are greatly relaxed. Its noise-coupled and time-interleaved structure further decreases the power consumption. The prototype chip was fabricated in a 0.18 um CMOS technology. Experimental results...
Wavelength modulation technique (WMT) and wavelength sweep technique (WST) are introduced into intra-cavity absorption gas sensors (ICAGS) for low concentration gas detection. The optimized parameters of the system maximizing the signal-to-noise ratio (SNR) are found. Calibration of acetylene concentration and gas recognition are both realized.
A secure communication method via chaotic parameter modulation is studied. Based on Lyapunov stability theory and active control strategy, the simple controller is presented. Via chaotic parameter modulation, chaotic secure communication is derived. The particle filtering technique is designed in the receiving terminal to make the information signals recover effectively. The simulation results show...
In this paper, labeling is jointly designed with the outer code by the EXIT chart based analysis to improve the performance of bit-interleaved coded modulation with iterative decoding. A systematic design methodology is proposed for regular modulation schemes which can easily obtain a set of labelings with various slopes. Given an outer code, the optimal labeling which has the steepest slope but still...
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