Abstract
Channel estimation is a key feature for free space optical (FSO) wireless communication systems which are required for a high QoS and high data rate system. Aiming at the problem of FSO wireless channel estimation, this paper proposes an implicit sequence channel estimation scheme to eliminate dc offset, and studies the key factors affecting the system performance. The optimal power allocation factor is derived based on the maximum SNR criterion. The system performance parameters such as the bit error rate (BER), mean square error (MSE), and computational complexity are evaluated. The results show that under the same dc bias condition, the MSE is estimated to decrease significantly after using the method of this paper. With the increase of dc offset d , the system error rate is significantly reduced and more approaching d = 0 (i.e., no dc offset). The proposed algorithm effectively mitigates the dc offset impact on the system and the BER is significantly improved while the MSE is reduced to 50% of the traditional state-of-the-art method. The proposed work can provide a technical solution to the FSO system and give support to technological development.
Highlights
The wireless optical communication system uses light as an information carrier for data transmission, and has the characteristics of frequency bandwidth, large communication capacity, strong anti-interference, and the like, and does not interfere with electronic equipment, and can be applied to homes and offices
In order to better illustrate the effectiveness and feasibility of the proposed method, the channel order L case is known to 4PPM modulation, for example, are given the mean square error (MSE) method, the bit error rate, and the algorithm complexity performance
Aiming at the problem of wireless optical channel estimation, this paper proposes an implicit sequence channel estimation scheme to eliminate DC offset and studies the key factors affecting system performance
Summary
The wireless optical communication system uses light as an information carrier for data transmission, and has the characteristics of frequency bandwidth, large communication capacity, strong anti-interference, and the like, and does not interfere with electronic equipment, and can be applied to homes and offices. Implicit Training (IT) channel estimation is a channel estimation method that superimposes training sequence algebra on information sequences [2]–[5]. Used blind channel estimation [6], [7] and channel estimation training sequence (TS) based [5]–[12] compared to its no extra bandwidth, and the receiving terminal only with an order statistical property can be training sequence is isolated. The method can effectively improve the utilization of bandwidth, and at the same time avoids the problems of high complexity and difficulty in implementation when using high-order statistical characteristics.
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