scholarly journals Equal-gain combining with interference mitigation for molecular type hopping assisted molecular shift keying systems

2021 ◽  
Vol 2 (2) ◽  
pp. 157-164
Author(s):  
Weidong Gao ◽  
Terrence Mak ◽  
Lie-Liang Yang
Keyword(s):  
Multiple Access ◽  
Interference Mitigation ◽  
Multiple Access Interference ◽  
Low Complexity ◽  
Practical Implementation ◽  
Molecular Type ◽  
Equal Gain Combining ◽  
Detection Scheme ◽  
Reliable Communications ◽  
Shift Keying

In multiple access molecular diffusive communications, many nano-machines exchange information and fuse data through a common Diffusive Molecular Communication (DMC) channel. Hence, there is Multiple-Access Interference (MAI), which should be sufficiently mitigated so as to achieve reliable communications. In this paper, we propose a novel low-complexity detection scheme, namely Equal-Gain Combining with Interference Mitigation (EGC-IM), for signal detection in the Molecular Type Hopping assisted Molecular Shift Keying (MTH-MoSK) DMC systems. By removing a number of entries from each row of the detection matrix formed during detection, the EGC-IM scheme shows its potential to significantly mitigate MAI and hence, outperform the conventional EGC scheme. Furthermore, the EGC-IM scheme has lower complexity than the conventional EGC scheme and therefore, it is beneficial for practical implementation.

Novel Scheme for Multiple-Access Interference Mitigation with Low Complexity

2011 ◽  
Vol 143-144 ◽  
pp. 371-375
Author(s):  
Zuo Liang Yin ◽  
Hui Xiao Ma ◽  
Xing Peng Mao ◽  
Jun Cai
Keyword(s):  
Multiple Access ◽  
Interference Mitigation ◽  
Multiple Access Interference ◽  
Low Complexity ◽  
System Capacity ◽  
Error Performance ◽  
Multiuser Detector ◽  
Access Scheme ◽  
Lower Complexity

To mitigate multiple access interference and improve the system capacity, an effective multiple access scheme, called GCDMA, is proposed. Exploiting the IDMA iterative multiuser detector in each group, the intra-group interference can be effectively handled. Analysis and simulations demonstrate that the proposed technique outperforms the conventional CDMA in terms of both system capacity and bit error performance. Lower complexity of the proposed scheme can be achieved than CDMA and even IDMA.

scholarly journals A Novel Detection Scheme for EBPSK System

2012 ◽  
Vol 2012 ◽  
pp. 1-14 ◽  
Author(s):  
Xianqing Chen ◽  
Lenan Wu
Keyword(s):  
Communication System ◽  
Communication Systems ◽  
Low Complexity ◽  
Detection Technique ◽  
Joint Detection ◽  
Phase Shift Keying ◽  
Detection Scheme ◽  
New Approach ◽  
Shift Keying ◽  
Binary Phase Shift Keying

We introduce the extended binary phase shift keying (EBPSK) communication system which is different from traditional communication systems by using a special impacting filter (SIF) for demodulation. The joint detection technique is applied at the demodulator side in order to improve the performance of the system under intersymbol interference (ISI). The main advantage of the joint detection technique, when compared to conventional threshold approaches, lies in its ability to use the amplitude and the correlation between neighboring bits, thus significantly improving performance, with low complexity. Moreover, we concentrate not only on increasing the bit rate of the system, but also on designing a bandwidth efficient communication system. Simulation results show that this new approach significantly outperforms the conventional method of using threshold decision by from 3.5 to 5 dB. The new system also occupies a narrower bandwidth. So joint detection is an effective method for EBPSK demodulation under ISI.

scholarly journals Carrier Frequency Offsets Problem in DCT-SC-FDMA System: Investigation and Compensation

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Faisal S. Al-kamali ◽  
Moawad I. Dessouky ◽  
Bassiouny M. Sallam ◽  
Farid Shawki ◽  
Fathi E. Abd El-Samie
Keyword(s):  
Carrier Frequency ◽  
Interference Cancellation ◽  
Multiple Access ◽  
Minimum Mean Square Error ◽  
Multiple Access Interference ◽  
Low Complexity ◽  
Estimation Errors ◽  
Carrier Frequency Offsets ◽  
Frequency Offsets ◽  
The Impact

The Single-Carrier Frequency Division Multiple Access (SC-FDMA) system is a well-known system, which has recently become a preferred choice for uplink channels. In this system, the Carrier Frequency Offsets (CFOs) disrupt the orthogonality between subcarriers and give rise to Intercarrier Interference (ICI), and Multiple Access Interference (MAI) among users. In this paper, the impact of the CFOs on the performance of the Discrete Cosine Transform (DCT) SC-FDMA (DCT-SC-FDMA) system is investigated. Then, a new low-complexity joint equalization and CFOs compensation scheme is proposed to cancel the interference in frequency domain. The Minimum Mean Square Error (MMSE) equalizer is utilized in the proposed scheme. A hybrid scheme comprising MMSE equalization, CFOs compensation, and Parallel Interference Cancellation (PIC) is also suggested and investigated for further enhancement of the performance of the DCT-SC-FDMA system with interleaved subcarriers assignment. For simplicity, this scheme will be referred to as the MMSE+PIC scheme. From the obtained simulation results, it is found that the proposed schemes are able to enhance the system performance, even in the presence of the estimation errors.

Multiuser Detection for Mobile Communication Signals in Urban Architecture

2014 ◽  
Vol 701-702 ◽  
pp. 979-988
Author(s):  
Bo Chen
Keyword(s):  
Multiuser Detection ◽  
Mobile Communication ◽  
Multiple Access ◽  
Multiple Access Interference ◽  
Low Complexity ◽  
Linear Filter ◽  
Urban Architecture ◽  
Communication Signals ◽  
Code Division Multiple ◽  
Cellular Mobile

Aim to the problem of code-division multiple-access (CDMA) with both multiple-access interference (MAI) and intersymbol interference (ISI) in dispersive channels of cellular mobile communication under urban architecture’s influence, low-complexity multiuser detection is proposed to suppress MAI and ISI jointly. This technique is considered to base on a blind linear filter detector with the subspace-based and auxiliary vector incorporated the desired user's signature waveform. It is showed that the performance of newly proposed detector outperforms the conventional detectors.

scholarly journals FPGA Implementation of Block Parallel DF-MPIC Detectors for DS-CDMA Systems in Frequency-Nonselective Channels

2008 ◽  
Vol 2008 ◽  
pp. 1-5 ◽  
Author(s):  
Adel Omar Dahmane ◽  
Lotfi Mejri
Keyword(s):  
Interference Cancellation ◽  
Multiple Access ◽  
Multiple Access Interference ◽  
Fpga Implementation ◽  
Decision Feedback ◽  
Practical Implementation ◽  
Parallel Interference Cancellation ◽  
Arithmetic Complexity ◽  
Cdma Systems ◽  
Code Division Multiple

Multistage parallel interference cancellation- (MPIC-) based detectors allow to mitigate multiple-access interference in direct-sequence code-division multiple-access (DS-CDMA) systems. They are considered serious candidates for practical implementation showing a good tradeoff between performance and complexity. Better performance is obtained when decision feedback (DF) is employed. Although MPIC and DF-MPIC have the same arithmetic complexity, DF-MPIC needs much more FPGA resources when compared to MPIC without decision feedback. In this letter, FPGA implementation of block parallel DF-MPIC (BP-DF-MPIC) is proposed allowing better tradeoff between performance and FPGA area occupancy. To reach an uncoded bit-error rate of10−3, BP-DF-MPIC shows a 1.5 dB improvement over the MPIC without decision feedback with only 8% increase in FPGA resources compared to 69% for DF-MPIC.

Sign in / Sign up

Export Citation Format

Share Document