scholarly journals Novel method for the selection of time hopping codes for UWB communication systems

2018 ◽  
Vol 7 (4) ◽  
pp. 2063 ◽  
Author(s):  
Rajendra Singh ◽  
Dr BS Jassal
Keyword(s):  
Communication System ◽  
Communication Systems ◽  
Time Hopping ◽  
Single User ◽  
Novel Method ◽  
Overall Performance ◽  
Random Codes ◽  
Correlation Properties ◽  
Uwb Communication ◽  
Selection Of

This work investigates the BER performance of existing code families of Frequency Hopping (FH) codes as Time Hopping (TH) codes in multiuser UWB communication environment and provides a novel method for the selection of TH codes. The performance of codes has been validated in AWGN channel for single user and further validated over multiuser environment. A significant improvement in performance has been observed over random codes. It is validated that selection of better TH codes reduces the MUI and improves the overall performance of the communication system and FH codes with better correlation properties can be used as TH codes in multiuser UWB communication system.  

PERFORMANCE ANALYSIS OF A NOVEL M-ARY CODE SELECTED DS-BPAM UWB COMMUNICATION SYSTEM

2006 ◽  
Vol 15 (03) ◽  
pp. 455-466 ◽  
Author(s):  
ZHIQUAN BAI ◽  
SHAOYI XU ◽  
WEIHUA ZHANG ◽  
KYUNGSUP KWAK
Keyword(s):  
Communication System ◽  
Signal To Noise Ratio ◽  
Pulse Amplitude ◽  
Ultra Wideband ◽  
Modulation Scheme ◽  
Direct Sequence ◽  
High Bit Rate ◽  
Modulation Level ◽  
Uwb Communication ◽  
Selection Of

A novel M-ary direct sequence ultra wideband (UWB) communication system based on the selection of the direct sequence code is studied in this paper. The proposed M-ary code selected direct sequence bipolar pulse amplitude modulation scheme can achieve high bit rate without increasing the system bandwidth or changing the pulse shape. With the increase of the modulation level M, the system bit error rate will be improved even at lower signal to noise ratio per bit. The exact bit error probability is derived over the AWGN channel and correlation receivers. Both Monte-Carlo simulation and the theoretical analysis prove the efficiency of this M-ary UWB system.

scholarly journals Design of Pulse Waveform for Waveform Division Multiple Access UWB Wireless Communication System

2014 ◽  
Vol 2014 ◽  
pp. 1-11 ◽  
Author(s):  
Zhendong Yin ◽  
Zhirui Wang ◽  
Xiaohui Liu ◽  
Zhilu Wu
Keyword(s):  
Communication System ◽  
Multiple Access ◽  
Multiple Access Interference ◽  
Wavelet Function ◽  
Correlation Property ◽  
Access Scheme ◽  
Single User ◽  
The One ◽  
Combination Mode ◽  
Correlation Properties

A new multiple access scheme, Waveform Division Multiple Access (WDMA) based on the orthogonal wavelet function, is presented. After studying the correlation properties of different categories of single wavelet functions, the one with the best correlation property will be chosen as the foundation for combined waveform. In the communication system, each user is assigned to different combined orthogonal waveform. Demonstrated by simulation, combined waveform is more suitable than single wavelet function to be a communication medium in WDMA system. Due to the excellent orthogonality, the bit error rate (BER) of multiuser with combined waveforms is so close to that of single user in a synchronous system. That is to say, the multiple access interference (MAI) is almost eliminated. Furthermore, even in an asynchronous system without multiuser detection after matched filters, the result is still pretty ideal and satisfactory by using the third combination mode that will be mentioned in the study.

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