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Research on Multiuser Detection Algorithm for Multistage Fast-FH/MFSK System Based on Frequency Hopping Sequence with No-Hit-Zone

Author: ZhaoYongLi
Tutor: PengDaiYuan
School: Southwest Jiaotong University
Course: Communication and Information System
Keywords: Frequency hopping communication FFH / MFSK communication No collision District hopping sequence Multi-user detection Interference cancellation
CLC: TN914.41
Type: Master's thesis
Year: 2011
Downloads: 23
Quote: 0
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Abstract


Hopping communication technology is one of the spread-spectrum communication technology, a multiple access technology that allows multiple users to transmit information at the same time on the same frequency band. Hopping multiple access technology has the following advantages: does not require continuous spectrum band interference can be avoided; insensitive to the proximity effect, you can not use the power control is widely used in military, commercial and other fields. But with direct spread spectrum multiple access (DS-CDMA) communication hopping multiple access communication also facing multiple access interference (MAI) problem, there are two main approaches to overcome interference in frequency hopping systems: One Design Hamming as low as possible pattern is used to eliminate or reduce the MAI multi-user detection technology. This paper attempts to combine these two methods, in order to get a better anti-MAI. In this paper, first the collision zone (NHZ) hopping code, class code does not occur in a particular interval frequency coincidence, and according to the characteristics of the class codes using multi-level fast frequency hopping multiple frequency shift keying (FFH / MFSK ) quasi-synchronous system, the system will total active user groups, group user and group user the best address code and NHZ code distinguish and user delay does not exceed the NHZ, so the group between user interference. Then, in order to further reduce the bit error rate (BER), using multi-user detection algorithm at the receiving end, that is based on the maximum line minimum mean square error (MMSE) asynchronous fast frequency hopping multiple access interference cancellation algorithm for this algorithm . Finally, the authors also studied the multi-level iterative interference cancellation (MS-IIC) algorithm. The authors completed the following work: details NHZ hopping sequence, the sequence were constructed in the finite field GF (p) and GF (pm) and analyze its performance. Structures based on the NHZ sequences of two FFH / MFSK system models, including a model of the sender and the receiver-side model. Detailed the optimal address code structure and coding scheme, and then analyzes the group users multiple access interference, according to the interference model derived the symbol interference Formula simulation MATLAB platform, the system function modules. Depth study MMSE multiuser detection algorithm for asynchronous FFH / MFSK system has been improved, and for the efficiency of the algorithm and detection performance and system complexity, these two algorithms under AWGN and Rayleigh channel simulation. The simulation results show that the improved algorithm is also lower in the signal-to-noise ratio is lower BER, and is more suitable for multi-user situations. Author proved by way of example, compared to the MMSE algorithm, and the MMSE algorithm improved detection efficiency and low complexity. The authors also studied the threshold threshold system capacity, one iteration, the improved algorithm is less affected by the threshold; addition, the simulation also verify that a certain part of the conditions there exists an optimal combination of parameters best may reduce the BER. Research and improved MS-IIC algorithm comparison shows that, according to the simulation analysis and examples the MS-IIC improved algorithm can improve the detection efficiency, improve system performance and reduce the complexity of the algorithm. Pointed out the inadequacies and subsequent improvement algorithm still exist, and gives directions for future research.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Communicate > Communication systems ( transmission system) > Frequency hopping spread spectrum communication system > Frequency hopping communication
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