60GHz通信系統(tǒng)中信道編碼及調制技術研究
發(fā)布時間：2018-08-16 14:08
【摘要】：60GHz毫米波通信系統(tǒng)是一種短距離超高速傳輸系統(tǒng),具有抗干擾能力強,免許可帶寬等優(yōu)點。隨著低頻段頻譜擁擠以及大數(shù)據(jù)傳輸?shù)男枨笾饾u增長,60GHz通信的優(yōu)勢逐漸凸顯,人們越來越重視60GHz通信系統(tǒng)的研究。毫米波信號的傳播距離較近,在視距(Line of Sight,LOS)信道中信號受到的影響較小,在非視距(Non Line of Sight,NLOS)信道中存在障礙物對信號的吸收作用,使得信號傳播受到較大影響。信道編碼的檢錯和糾錯能力,可以將信號從信道的影響中恢復出來。60GHz通信系統(tǒng)的信道編碼為低密度奇偶校驗(Low Density Parity Check,LDPC)碼,LDPC碼是一類高效糾錯碼,其校驗矩陣具有稀疏特性。在60GHz通信系統(tǒng)中使用LDPC碼能滿足性能與實現(xiàn)復雜度之間的良好折中�？臻g調制是近年來提出的一種新型的多輸入多輸出(Multiple-Input Multiple-Output,MIMO)技術,創(chuàng)新性的通過空間映射傳輸信息,有效的避免了信道間干擾(Inter-Channel Interference,ICI)和天線同步(Inter-Antenna Synchronization,IAS)等問題。在相同傳輸速率下,空間調制具有更低的復雜度。因此,在具有較高傳輸速率的60GHz通信系統(tǒng)中,研究空間調制具有一定的意義。綜上所述,本文分別對60GHz通信系統(tǒng)中的信道編碼以及空間調制展開如下研究工作:第二章研究了60GHz通信系統(tǒng)中兩種LDPC碼的編譯碼算法,并著重研究了其在60GHz通信系統(tǒng)中的性能。其中一種LDPC碼來自于IEEE 802.11ad標準,另一種是60GHz項目中所構建的LDPC碼。首先,對兩種碼字的結構進行分析,給出其相應的編譯碼算法,然后對兩種LDPC碼在60GHz信道上分別進行仿真并分析比較誤碼性能。結果表明,在不同信道中,即使信道質量較差,兩種LDPC碼均能較好的恢復60GHz信號。第三章在研究空間調制信號傳統(tǒng)信號檢測算法的基礎上,把空間調制技術擴展應用到了頻率選擇性衰落信道上。首先,研究了多徑信道中空間調制的系統(tǒng)模型,通過分析空間調制信號在多徑信道中的傳播過程,構造了天線和信道的聯(lián)合網(wǎng)格圖,然后利用維特比(Viterbi)算法進行路徑搜索,對空間調制信號進行信號檢測。最后對幾種不同的空間調制方案進行了仿真研究。數(shù)字仿真結果顯示,本文提出的信號檢測算法可以有效的檢測多徑信道中的空間調制信號,并且在傳輸速率較高的情況下,空間調制的性能優(yōu)于傳統(tǒng)調制。第四章主要研究了基于60GHz通信系統(tǒng)簡單信道模型的空間調制技術。首先分析了60GHz信道的傳播特性,根據(jù)信道特性將60GHz通信系統(tǒng)中兩種信道分別等效為簡單的單徑與多徑信道。在兩種等效信道中,分別采用傳統(tǒng)的信號檢測算法以及第三章提出的檢測算法進行信號檢測。同時研究了空間調制及其相關技術在兩種等效信道模型下的性能,并與傳統(tǒng)調制進行了性能對比。結果顯示,在LOS信道中,信道的相關性導致空間調制的性能并不理想;在NLOS信道中,當數(shù)據(jù)傳輸速率較高時,空間調制及其衍生技術相對于傳統(tǒng)調制方式具有較好的性能。綜上,本文研究了基于60GHz通信系統(tǒng)中的LDPC編碼及空間調制技術,并對目前存在的不足提出建議,針對需要改進的地方做了簡要討論。
[Abstract]:60GHz millimeter wave communication system is a kind of short-range and ultra-high-speed transmission system, which has the advantages of strong anti-jamming ability and free bandwidth. With the increasing demand of low-frequency spectrum congestion and large data transmission, the advantages of 60GHz communication are gradually highlighted. People pay more and more attention to the research of 60GHz communication system. Nearer, in the Line of Sight (LOS) channel, the signal is less affected, and in the non-Line of Sight (NLOS) channel, there are obstacles which absorb the signal, so the signal propagation is greatly affected. Channel coding is low density parity check (LDPC) codes. LDPC codes are a class of efficient error correction codes with sparse check matrices. LDPC codes in 60GHz communication systems can meet the tradeoff between performance and complexity. Spatial modulation is a new type of multiple input multiple output (MIMO) codes proposed in recent years. Ultiple-Input Multiple-Output (MIMO) technology, which transmits information innovatively through spatial mapping, effectively avoids the problems of Inter-Channel Interference (ICI) and Inter-Antenna Synchronization (IAS). At the same transmission rate, spatial modulation has lower complexity. In the 60GHz communication system with transmission rate, it is meaningful to study the spatial modulation. In summary, this paper studies the channel coding and spatial modulation in the 60GHz communication system as follows: Chapter 2 studies the coding and decoding algorithms of two LDPC codes in the 60GHz communication system, and focuses on their performance in the 60GHz communication system. One of the LDPC codes comes from IEEE 802.11ad standard and the other is LDPC codes constructed in the 60GHz project. Firstly, the structure of the two codes is analyzed, and the corresponding encoding and decoding algorithms are given. Then the two LDPC codes are simulated on the 60GHz channel and the BER performance is analyzed and compared. The channel quality is poor, and both LDPC codes can recover 60GHz signal well. In the third chapter, the spatial modulation technology is extended to the frequency selective fading channel based on the study of the traditional signal detection algorithm of spatial modulation signal. Firstly, the system model of spatial modulation in multipath channel is studied, and the spatial modulation signal is analyzed. A joint mesh of antenna and channel is constructed in the propagation process of multipath channel, and then a path search algorithm based on Viterbi algorithm is used to detect the spatial modulation signal. Finally, several different spatial modulation schemes are simulated. The digital simulation results show that the proposed algorithm is feasible. In order to effectively detect the spatial modulation signals in multipath channels, and the performance of spatial modulation is better than that of traditional modulation at a higher transmission rate. Chapter 4 mainly studies the spatial modulation technology based on the simple channel model of 60GHz communication system. In the two equivalent channels, the traditional signal detection algorithm and the detection algorithm proposed in Chapter 3 are used for signal detection respectively. The performance of spatial modulation and its related technologies under the two equivalent channel models is studied and compared with the traditional modulation. The results show that the performance of spatial modulation is unsatisfactory in LOS channel because of the correlation of channels. In NLOS channel, the performance of spatial modulation and its derivatives is better than that of traditional modulation when the data transmission rate is high. In summary, this paper studies LDPC coding and spatial modulation in 60GHz communication system. The technology and suggestions for the deficiencies are briefly discussed.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN928
本文編號：2186213
[Abstract]:60GHz millimeter wave communication system is a kind of short-range and ultra-high-speed transmission system, which has the advantages of strong anti-jamming ability and free bandwidth. With the increasing demand of low-frequency spectrum congestion and large data transmission, the advantages of 60GHz communication are gradually highlighted. People pay more and more attention to the research of 60GHz communication system. Nearer, in the Line of Sight (LOS) channel, the signal is less affected, and in the non-Line of Sight (NLOS) channel, there are obstacles which absorb the signal, so the signal propagation is greatly affected. Channel coding is low density parity check (LDPC) codes. LDPC codes are a class of efficient error correction codes with sparse check matrices. LDPC codes in 60GHz communication systems can meet the tradeoff between performance and complexity. Spatial modulation is a new type of multiple input multiple output (MIMO) codes proposed in recent years. Ultiple-Input Multiple-Output (MIMO) technology, which transmits information innovatively through spatial mapping, effectively avoids the problems of Inter-Channel Interference (ICI) and Inter-Antenna Synchronization (IAS). At the same transmission rate, spatial modulation has lower complexity. In the 60GHz communication system with transmission rate, it is meaningful to study the spatial modulation. In summary, this paper studies the channel coding and spatial modulation in the 60GHz communication system as follows: Chapter 2 studies the coding and decoding algorithms of two LDPC codes in the 60GHz communication system, and focuses on their performance in the 60GHz communication system. One of the LDPC codes comes from IEEE 802.11ad standard and the other is LDPC codes constructed in the 60GHz project. Firstly, the structure of the two codes is analyzed, and the corresponding encoding and decoding algorithms are given. Then the two LDPC codes are simulated on the 60GHz channel and the BER performance is analyzed and compared. The channel quality is poor, and both LDPC codes can recover 60GHz signal well. In the third chapter, the spatial modulation technology is extended to the frequency selective fading channel based on the study of the traditional signal detection algorithm of spatial modulation signal. Firstly, the system model of spatial modulation in multipath channel is studied, and the spatial modulation signal is analyzed. A joint mesh of antenna and channel is constructed in the propagation process of multipath channel, and then a path search algorithm based on Viterbi algorithm is used to detect the spatial modulation signal. Finally, several different spatial modulation schemes are simulated. The digital simulation results show that the proposed algorithm is feasible. In order to effectively detect the spatial modulation signals in multipath channels, and the performance of spatial modulation is better than that of traditional modulation at a higher transmission rate. Chapter 4 mainly studies the spatial modulation technology based on the simple channel model of 60GHz communication system. In the two equivalent channels, the traditional signal detection algorithm and the detection algorithm proposed in Chapter 3 are used for signal detection respectively. The performance of spatial modulation and its related technologies under the two equivalent channel models is studied and compared with the traditional modulation. The results show that the performance of spatial modulation is unsatisfactory in LOS channel because of the correlation of channels. In NLOS channel, the performance of spatial modulation and its derivatives is better than that of traditional modulation when the data transmission rate is high. In summary, this paper studies LDPC coding and spatial modulation in 60GHz communication system. The technology and suggestions for the deficiencies are briefly discussed.
【學位授予單位】：電子科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN928
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，本文編號：2186213
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