Quadrature Amplitude Position Modulation Research Articles

Packet Size Optimization for Energy Efficiency in Multipath Fading for Wireless Body Area Network

Recently, Wireless Body Area Network (WBAN) has drawn vast interest to many researchers due to its potential in healthcare and medical fields. In this paper, we propose the energy efficiency model of Time Diversity communication in Rician and Rayleigh fading channels emphasizing the optimal packet size. The optimal packet size to maximize energy efficiency is investigated for on-body and in-body channels. Four modulation techniques are considered including the recently proposed 16-ary Quadrature Amplitude Position Modulation (QAPM). In addition, the closed-form expression of the energy efficiency model in multipath fading is derived. Here, three evaluation metrics including the energy efficiency, the normalized throughput and the average end-to-end delay are adopted and compared to the existing 1-hop and Cooperative communications as well as our previously proposed 2-hop communication. The results show that our proposed Time Diversity communication scheme outperforms the existing ones in deep fading channel except for the average end-to-end delay.

저전력 근거리 통신을 위한 QAPM 변조의 설계와 압축 센싱의 적용

본 논문은 저전력 통신을 위하여, 압축 센싱에 적용한 QAPM 변조 방식을 제안한다. QAPM 변조 방식은 QAM 변조 방식과 PPM 변조 방식을 결합한 방식으로써, 자리(PPM의 posion) 개수가 늘어날수록 심볼 간의 거리가 멀어져 BER 성능과 전력 효율을 향상시킨다. 또한, 자리개수를 늘릴수록 대역이 손실 발생될 수 있으나, 성김(sparsity) 특성은 증가된다. 이러한 높은 성김 특성은 Nyquist 속도 이하의 샘플링으로도 완전하게 신호를 복원할 수 있는 압축 센싱에 적용하기에 매우 적합하다. 따라서 본 논문은 압축 센싱에 적용된 QAPM 시스템이 수신기에 있는 ADC(Analog Digital Converter)의 부담을 줄이면서도 BER 성능을 향상시키는 저전력 시스템임을 시뮬레이션을 통해 확인하였다. In this paper, we propose a QAPM(Quadrature Amplitude Position Modulation) modulation using compressive sensing for the purpose of power efficiency improvement. QAPM modulation is a combination technique of QAM (quadrature amplitude modulation) and PPM(Pulse Position Modulation). Therefore it can decrease the transmission power and improve BER performance. Moreover, even if the band width is widened when the number of positions is increased, high sparsity characteristic caused by position number can be applied to compressive sensing technique. Compressive sensing has recently studied as a method that can be successfully reconstructed from the small number of measurements for sparse signal. Therefore, the proposed system can lower price of receiver by reducing sampling rate and has performance improved by using QAPM modulation. And the results are confirmed through simulations.

Multicarrier-Based QAPM Modulation System for the Low Power Consumption and High Data Rates

Low power consumption and high data rate are the most important requirements for the communication system. Especially, very low power consumption modulation method is required for the short range communication systems such as the medical implantable communication devices or capsule endoscope, and so on. For the higher data rate, we like to combine the OFDM system into the QAPM since the OFDM system has higher bandwidth efficiency than a single-carrier system. In this paper, we like to propose a QAPM (Quadrature amplitude position modulation) method combined with the orthogonal frequency-division multiplexing (OFDM) system. Next, we analyze the performance of three low-power-consumption modulation schemes: the phase shift position modulation (PSPM), phase silence shift keying (PSSK), and QAPM using orthogonal frequency-division multiplexing (OFDM) system in the multi-path channel. These schemes have lower bandwidth efficiency and the higher power efficiency than the existing phase-shift keying (PSK) and quadrature amplitude modulation (QAM) schemes. It can be shown that they can achieve greater power efficiency because every modulation symbol has a zero-envelope period as in pulse-position modulation (PPM) techniques. Finally, we compare the performances of the PSPM, PSSK, and QAPM modulation combined with the OFDM system with regard to bit error rate performance and throughput.

고전력 효율 Quadrature-Amplitude-Position-Modulation 변조 방식과 성능 평가

본 논문은 저전력 통신 변조 방식으로 새로운 QAPM(Quadrature Amplitude Position Modulation) 방식을 제안하며, 기존의 PSSK(Phase Silence Shift Keying) 변조와의 성능을 비교한다. 기존의 저전력 변조 방식의 하나인 PSSK는 PSK 변조를 기반으로 하여 PPM(Pulse Position Modulation) 변조를 결합한 방식이다. PSSK는 2개의 직교 심볼을 전송하는 방식으로 신호 주기내의 심볼 비율을 절반으로 하여 송신전력을 낮추고, 변조 심볼간의 거리를 늘림으로써 BER 성능에 향상을 가져왔다. 대역 효율은 기존의 PSK에 비해 2배 낮아졌으나 BER(Bit Error Rate) 성능은 6dB까지 향상 시켰다. 이러한 BER의 향상은 변조 레벨을 낮춤으로써 얻어지는 결과이다. 새로 제안하는 QAPM 방식은 QAM 변조를 기반으로하며, PSSK와 동일한 방식으로 심볼을 배치한다. QAM의 BER 성능은 기본적으로 PSK보다 뛰어나므로 QAPM 변조방식은 기존의 PSSK보다 더 뛰어난 BER 성능을 보여준다. 이 논문에서는 PSSK와 QAPM을 AWGN 채널에서의 BER 성능과 Throughput 성능을 비교하였다. In this paper, we propose QAPM(Quadrature Amplitude Position Modulation) modulation scheme for improving power efficiency and we compare existing PSSK(Phase Silence Shift Keying) and QAPM. An existing PSSK Modulation is extension from PSK modulation technique. The conventional PSSK modulation technique can be regarded as an extension from PSK modulation. And this PSSK has better power efficiency than PSK modulation. The Bandwidth efficiency of PSSK is half than PSK, but improved BER(Bit Error Rate) performance. A propose QAPM scheme is build on QAM. And BER performance of QAPM is better than PSSK because BER performance of QAM is better than PSK. In this paper, we compare PSSK and QAPM regard to bit error rate and throughput.