Abstract
High throughput, low latency and reliable communication has always been a hot topic for wireless sensor networks (WSNs) in various applications. Multiuser detection is widely used to suppress the bad effect of multiple access interference in WSNs. In this paper, a novel multiuser detection method based on differential characteristics is proposed to suppress multiple access interference. The proposed iterative receive method consists of three stages. Firstly, a differential characteristics function is presented based on the optimal multiuser detection decision function; then on the basis of differential characteristics, a preliminary threshold detection is utilized to find the potential wrongly received bits; after that an error bit corrector is employed to correct the wrong bits. In order to further lower the bit error ratio (BER), the differential characteristics calculation, threshold detection and error bit correction process described above are iteratively executed. Simulation results show that after only a few iterations the proposed multiuser detection method can achieve satisfactory BER performance. Besides, BER and near far resistance performance are much better than traditional suboptimal multiuser detection methods. Furthermore, the proposed iterative multiuser detection method also has a large system capacity.
Highlights
Wireless sensor network (WSN) is a special kind of ad-hoc network which can be applied in military, home industrial and other monitoring scenarios [1]
After a bank of matched filters, the output of kth user sampled at T is achieved by the following expression: yk =
The differential characteristics calculation, threshold detection and error bit correction process are iterated as shown in Figure 1 to further lower the bit error ratio (BER)
Summary
Wireless sensor network (WSN) is a special kind of ad-hoc network which can be applied in military, home industrial and other monitoring scenarios [1]. As for coded DS-UWB systems, iterative multiuser detection methods were widely analyzed These suboptimal multiuser detection algorithms seek tradeoff between computation complexity and BER performance. Reference [26] proposed an iterative multiuser detector for overloaded LDPC coded CDMA systems This receiver consists of a combination of matched filters in the first stage and a linear MMSE detector and an interference cancellation scheme in the successive stages. In this way, the receiver achieved better BER performance than Turbo coded systems. An iterative multiuser detection algorithm based on differential characteristics is proposed for DS-UWB systems.
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