正交分頻多工系統與濾波器多載波系統複雜度降低與效能提升之研究

金家安

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正交分频多工系统与滤波器多载波系统复杂度降低与效能提升之研究

An Investigation on reducing the complexity and improving performance of OFDM/FBMC systems

金家安 , 硕士　　导师：陈绍基　　

繁体中文

第五代行动通讯；正交分频多工系统；滤波器多载波系统；平均调变之正交分频多工系统；离散余弦转换；离散哈特利转换；快速傅立叶转换； 5th generation wireless systems ； OFDM ； FBMC ； Sigma-modulated input OFDM ； DCT ； DHT ； FFT

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摘要 │ 参考文献 (26) │ 国际计量

摘要〈TOP〉

并列摘要〈TOP〉

OFDM modulation has the disadvantage of high side lobes, which is undesirable for the future fifth generation mobile communication technology which demands stringent spectrum specifications. Moreover, reducing the complexity of a baseband transceiver is always a critical topic for mobile communication which require low-power comsumption and long battery operating time.
Specifically, we will try to reduce the complexity of FFT operations involved in OFDM and 5th generation FBMC (filter bank multicarrier) transmission techniques.
DCT-based and DHT-based OFDM have been proposed which have lower complexities than conventional DFT-based OFDM, since their transformation bases are real numbers instead of complex numbers. Although it has low complexity, there are some  limitations in the DCT-based OFDM, according to our analysis by means of both physical and mathematical derivations. Regarding DHT-based OFDM, we also derived the interference due to complementary subcarriers in more detail in the DHT, and proved that the system after removing interference is the same as traditional OFDM without additional benefit.
In addition, we design an OFDM with Sigma-modulated input signal to reduce the side lobes in the traditional OFDM system. Since roughly about one half of the input signals will become zero after the sigma modulation, the IDFT complexity in the sigma-modulated transmitter will be lower than the traditional OFDM. In this work, theoretical analysis discuss the theorem, performance, BER and detection algorithm of the modified OFDM are also discussed.
The future 5G hopeful FBMC system has much better spectrum characteristics than OFDM system, but has the drawback of high complexity. This thesis proposes a technique that reduces the associated FFT complexity to half of orignal by utilizing the OQAM characteristics. Besides, this thesis also discusses how to reduce the complexity of OFDM system by applying DHT as basis. Finally, this thesis also states possible further issues to be resolved.

参考文献 ( 26 ) 〈TOP〉

[2] L. Hanzo, Y. Akhtman, L. Wang and M. Jiang, "MIMO-OFDM for LTE, WiFi and WiMAX:Coherent versus Non-coherent and Cooperative Turbo Transceivers," Wiley, 2011.
连结：
[4] P. Tan and N. C. Beaulieu, "A Comparison of DCT-Based OFDM and DFT-Based OFDM in Frequency Offset and Fading Channels," in IEEE Transactions on Communications, vol. 54, no. 11, pp. 2113-2125, Nov. 2006.
连结：
[5] N. Al-Dhahir and Hlaing Minn, "A new multicarrier transceiver based on the discrete cosine transform," IEEE Wireless Communications and Networking Conference, Vol. 1, pp. 45-50, 2005.
连结：
[6] C. K. Jao, S. S. Long and M. T. Shiue, "DHT-Based OFDM System for Passband Transmission Over Frequency-Selective Channel," in IEEE Signal Processing Letters, vol. 17, no. 8, pp. 699-702, Aug. 2010.
连结：
[8] P. C. Chen, C. K. Jao, and M. T. Shiue, “A low complexity real-valuedkernel DHT-based OFDM modulator/demodulator design,” in Proc. IEEE Int. Symp. Circuits and Systems (ISCAS), May 2009, pp. 1529–1532.
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引用含有DOI的文献

DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。 如想对DOI的使用与概念有进一步了解，请参考 （ ） 。

DOI可强化引用精确性、增强学术圈连结，并给予使用者跨平台的良好使用经验，目前在全世界已有超过五千万个对象申请DOI。如想对DOI的使用与概念有进一步了解，请参考（）。