Research On Bluetooth Wireless Personal Area Network Improvement And IC Realization

More and more electronic consumer products use wireless technology as their air interface and they make up of the Wireless Personal Area Network (WPAN) around us. Now the WPAN has made our life become convenient and interesting. Many short distant wireless technologies can be used in the WPAN, but the Bluetooth is used most widely now. This dissertation studied the Bluetooth-based WPAN mainly. In order to improve the data throughput and data safety of the WPAN, its key technologies were studied and some new algorithms or techniques were used in the WPAN. This dissertation also contains the content that designing the improved Bluetooth system-on-chip (SoC) integrated circuit and using the new algorithms or techniques in the IC. The main contents of the dissertation are following as:First, the Bluetooth piconet is regard as the studied object. Then the model that the piconet transfers data in additive white gaussian noise (AWGN) channel is built up. After analyzing the structure of the Bluetooth data, data resent scheme and algorithms of error correct, the factor which decides the data throughput of Bluetooth piconet is found. And the function of Bluetooth piconet data throughput is deduced.Second, the factor which decides the piconet throughput is the signal noise ratio (SNR) in the AWGN channel. After studying the factor, some schemes which improve the piconet throughput are given. When the power of noise is too high, two schemes can weaken the influence of noise. One is that the Bluetooth device raise its output power, the other is that the Bluetooth device works on other channel. The first scheme can increase the SNR to improve the throughput, the latter can avoid the worse SNR channel to get better throughput. When the SNR is smaller and we can't raise the output power, we replace the GFSK modulation by MSK modulation. In this condition MSK modulation has better character. The piconet which uses MSK can achieve better throughput. And we select BCH code to protect the data payload, it can correct more error than 2/3FEC. That is to say, BCH code can improve the throughput. At last, we get the adaptive data packet type selected algorithm. With the RSSI function, it can keep the piconet throughput hold the high-point. The simulation and test results prove all of the schemes are available.Third, all the WPAN data safety is provided by Bluetooth piconet. The Bluetooth safety scheme is analyzed. It can be divide two parts. One is realized by software, the other is completed by hardware. This dissertation studies the hardware part mainly, it is data encrypt. Now the Bluetooth uses Eo to complete data stream encrypt, Eo is one of stream cipher and has many shortage. Two schemes are used to strengthen the encryption. One is that the shrinking generator is added in Eo, the other is that the data pay load is re-encrypt by AES. The shrinking generator can increase the linear complex of stream cipher from O(249) to O(68), and the AES encrypt is very powerful encrypt. So the two schemes can improve the data safety of WPAN.Fourth, the macroscopical WPAN data throughput is studied, all piconets are regard as a whole and every piconet is one element of the WPAN. The WPAN data throughput model is built, and the function of WPAN throughput is deduced. The result is that the hamming correlation of Bluetooth frequency hopping (FH) sequence is the most important factor. After analyzing the existing Bluetooth FH algorithm, we use Safer+, AES and chaotic algorithm to rebuild it. The simulation and test results can improve that the new FH algorithm can increase the WPAN throughput.Last, this dissertation designs the improved Bluetooth baseband IP with those schemes and algorithms, and gets the digital layout and parameters. The test and simulation results prove that the improved Bluetooth baseband IP has all designed functions. We also design the AES IP. The re-encrypt scheme and improved AES FH algorithm need it. It is suitable for the portable devices, and the power consumption could be further reduced while using low voltage power supply.