交织编码对蓝牙抗干扰性能改善的研究

Enhancing Bluetooth 2.1's anti-interference ability based on interleaving coding

针对蓝牙2.1+EDR在纠错和抗干扰方面的不足,分析和改进了蓝牙协议中数据链路层的纠错算法.在蓝牙2.1+EDR规范中,采用了融合交织编码和前向纠错的增强型纠错机制,加入了具有交织编码的DM分组(DMI分组)以提高蓝牙的数据传输吞吐速率及抗干扰能力;在Gillbert-Elliott信道下,建立了蓝牙数据传输吞吐量模型.利用该数学模型,计算出了各个数据分组在不同信道突发错误时的数据传输吞吐量.仿真结果表明,在蓝牙2.1+EDR新规范中加入DMI分组,明显地改善了数据传输的抗干扰能力,有效地提高了在突发错误信道下的数据传输速率.最后给出了该增强型纠错IP和增强型蓝牙基带IP的实现结果,并与标准蓝牙基带IP进行了比较,结果表明,引入增强型纠错IP大大提升了蓝牙基带的纠错性能,而蓝牙基带IP的功耗和面积资源只有少量的增加.

The error correction algorithms of Bluetooth are analyzed and improved for the defect of antiinterference ability. To enhance the data transmission throughput and anti-interference ability efficiently, an error correction enhancing mechanism （EECM） combining the forward error correction with interleaving is adopted for Bluetooth, a method of adding the DM packet with an interleaving code to the Bluetooth 2. 1＋ EDR specification is proposed. The mathematical models of the data transmission throughput are set up over the Gillbert-Elliott channel; A numerical simulation of the throughput of different packets in different burst errors are carried out using the model. Simulation results show that adding DM packets and DMI packets to Bluetooth 2.1 ＋EDR specification can improve the anti-interference ability and enhance data transmission throughput significantly in the burst errors channel. Finally, the realized results of the enhanced IP and enhanced Bluetooth baseband IP are obtained by using VLSI design techniques. The performance of the enhanced the Bluetooth baseband is analyzed in comparison with the standard Bluetooth baseband.