關(guān)于我們
書單推薦
新書推薦
|
無線通信(英文版) 讀者對象:本書內(nèi)容概念清晰,討論問題深入淺出,習(xí)題豐富,適合作為通信工程和電子信息類相關(guān)專業(yè)高年級本科生以及信息和通信工程專業(yè)研究生的雙語教學(xué)教材,同時也可作為信息技術(shù)相關(guān)專業(yè)的學(xué)生、教師以及科技工作者的參考書。
本書是無線通信領(lǐng)域的一本優(yōu)秀的經(jīng)典教材,介紹了無線通信的基本原理,重點論述了無線通信系統(tǒng)的基本理論與設(shè)計分析方法。全書內(nèi)容包括無線信道模型、無線信道容量、無線通信中的調(diào)制編碼技術(shù)及均衡處理技術(shù)、分集、擴頻通信,還包括多天線系統(tǒng)、多用戶系統(tǒng)、多載波調(diào)制、自適應(yīng)調(diào)制與編碼、蜂窩系統(tǒng)及無線自組織網(wǎng)絡(luò)等。影印版制作時已根據(jù)配套網(wǎng)站提供的勘誤表(2006年版)對內(nèi)容進行了更正。
斯坦福大學(xué)工程學(xué)院Stephen Harris教授,斯坦福大學(xué)電氣工程教授,美國工程院院士,美國藝術(shù)與科學(xué)院院士,主要研究方向為信息論與通信理論及其在無線通信中的應(yīng)用。
Andrea Goldsmith斯坦福大學(xué)工程學(xué)院Stephen Harris教授,斯坦福大學(xué)電氣工程教授,美國工程院院士,美國藝術(shù)與科學(xué)院院士,IEEE會士。主要研究方向包括信息論、通信理論和信號處理,以及這些技術(shù)在無線通信中的應(yīng)用。另外,她的研究方向還包括互連系統(tǒng)和神經(jīng)系統(tǒng)科學(xué)。
1 Overview of Wireless Communications 無線通信概述
1.1 History of Wireless Communications 無線通信的歷史 1.2 Wireless Vision 無線愿景 1.3 Technical Issues 技術(shù)問題 1.4 Current Wireless Systems 現(xiàn)有無線系統(tǒng) 1.4.1 Cellular Telephone Systems 蜂窩電話系統(tǒng) 1.4.2 Cordless Phones 無繩電話系統(tǒng) 1.4.3 Wireless Local Area Networks 無線局域網(wǎng) 1.4.4 Wide Area Wireless Data Services 廣域無線數(shù)據(jù)業(yè)務(wù) 1.4.5 Broadband Wireless Access 寬帶無線接入 1.4.6 Paging Systems 尋呼系統(tǒng) 1.4.7 Satellite Networks 衛(wèi)星通信網(wǎng) 1.4.8 Low-Cost, Low-Power Radios: Bluetooth and ZigBee 低成本、低功率的無線通信:藍牙和紫蜂 1.4.9 Ultrawideband Radios 超寬帶無線通信 1.5 The Wireless Spectrum 無線頻譜 1.5.1 Methods for Spectrum Allocation 頻譜的分配方式 1.5.2 Spectrum Allocations for Existing Systems 現(xiàn)有系統(tǒng)的頻譜分配 1.6 Standards 標(biāo)準(zhǔn) Problems 習(xí)題 References 參考文獻 2 Path Loss and Shadowing 路徑損耗和陰影衰落 2.1 Radio Wave Propagation 無線電波傳播 2.2 Transmit and Receive Signal Models 發(fā)送和接收信號模型 2.3 Free-Space Path Loss 自由空間路徑損耗 2.4 Ray Tracing 射線跟蹤 2.4.1 Two-Ray Model 兩徑模型 2.4.2 Ten-Ray Model (Dielectric Canyon) 十徑模型(介電峽谷) 2.4.3 General Ray Tracing 通用射線跟蹤 2.4.4 Local Mean Received Power 本地平均接收功率 2.5 Empirical Path-Loss Models 經(jīng)驗路徑損耗模型 2.5.1 Okumura Model 奧村模型 2.5.2 Hata Model 哈塔模型 2.5.3 COST 231 Extension to Hata Model 哈塔模型的COST 231擴展 2.5.4 Piecewise Linear (Multislope) Model 折線(多斜率)模型 2.5.5 Indoor Attenuation Factors 室內(nèi)衰減因子 2.6 Simplified Path-Loss Model 簡化的路徑損耗模型 2.7 Shadow Fading 陰影衰落 2.8 Combined Path Loss and Shadowing 路徑損耗和陰影衰落的混合模型 2.9 Outage Probability under Path Loss and Shadowing 路徑損耗和陰影衰落造成的中斷率 2.10?Cell Coverage Area 小區(qū)覆蓋范圍 Problems 習(xí)題 References 參考文獻 3 Statistical Multipath Channel Models 統(tǒng)計多徑信道模型 3.1 Time-Varying Channel Impulse Response 時變信道的沖激響應(yīng) 3.2 Narrowband Fading Models 窄帶衰落模型 3.2.1 Autocorrelation, Cross-Correlation, and Power Spectral Density 自相關(guān)、互相關(guān)和功率譜密度 3.2.2 Envelope and Power Distributions 包絡(luò)和功率分布 3.2.3 Level Crossing Rate and Average Fade Duration 電平通過率和平均衰落時長 3.2.4 Finite-State Markov Channels 有限狀態(tài)馬爾可夫信道 3.3 Wideband Fading Models 寬帶衰落模型 3.3.1 Power Delay Profile 功率時延譜 3.3.2 Coherence Bandwidth 相干帶寬 3.3.3 Doppler Power Spectrum and Channel Coherence Time 多普勒功率譜和信道相干時間 3.3.4 Transforms for Autocorrelation and Scattering Functions 自相關(guān)和散射函數(shù)的變換 3.4 Discrete-Time Model 離散時間模型 3.5 Space-Time Channel Models 空時信道模型 Problems 習(xí)題 References 參考文獻 4 Capacity of Wireless Channels 無線信道的信道容量 4.1 Capacity in AWGN AWGN信道容量 4.2 Capacity of Flat Fading Channels 平坦衰落信道的容量 4.2.1 Channel and System Model 信道和系統(tǒng)模型 4.2.2 Channel Distribution Information Known 信道分布信息已知 4.2.3 Channel Side Information at Receiver 接收端已知CSI 4.2.4 Channel Side Information at Transmitter and Receiver 收發(fā)兩端都已知CSI 4.2.5 Capacity with Receiver Diversity 接收分集的信道容量 4.2.6 Capacity Comparisons 容量對比 4.3 Capacity of Frequency-Selective Fading Channels 頻率選擇性衰落信道的容量 4.3.1 Time-Invariant Channels 時不變信道 4.3.2 Time-Varying Channels 時變信道 Problems 習(xí)題 References 參考文獻 5 Digital Modulation and Detection 數(shù)字調(diào)制與檢測 5.1 Signal Space Analysis 信號空間分析 5.1.1 Signal and System Model 信號與系統(tǒng)模型 5.1.2 Geometric Representation of Signals 信號的幾何表示 5.1.3 Receiver Structure and Sufficient Statistics 接收機結(jié)構(gòu)和充分統(tǒng)計量 5.1.4 Decision Regions and the Maximum Likelihood Decision Criterion 判決域和最大似然判決準(zhǔn)則 5.1.5 Error Probability and the Union Bound 誤碼率和聯(lián)合界 5.2 Passband Modulation Principles 帶通調(diào)制原理 5.3 Amplitude and Phase Modulation 幅度/相位調(diào)制 5.3.1 Pulse Amplitude Modulation (MPAM) 脈沖幅度調(diào)制 5.3.2 Phase-Shift Keying (MPSK) 相移鍵控 5.3.3 Quadrature Amplitude Modulation (MQAM) 正交幅度調(diào)制 5.3.4 Differential Modulation 差分調(diào)制 5.3.5 Constellation Shaping 星座成形 5.3.6 Quadrature Offset 正交偏移 5.4 Frequency Modulation 頻率調(diào)制 5.4.1 Frequency-Shift Keying (FSK) and Minimum-Shift Keying (MSK) 頻移鍵控和最小頻移鍵控 5.4.2 Continuous-Phase FSK (CPFSK) 連續(xù)相位頻移鍵控 5.4.3 Noncoherent Detection of FSK FSK的非相干檢測 5.5 Pulse Shaping 脈沖成形 5.6 Symbol Synchronization and Carrier Phase Recovery 碼元同步和載波相位恢復(fù) 5.6.1 Receiver Structure with Phase and Timing Recovery 具有相位和定時恢復(fù)的接收機結(jié)構(gòu) 5.6.2 Maximum Likelihood Phase Estimation 最大似然相位估計 5.6.3 Maximum Likelihood Timing Estimation 最大似然定時估計 Problems 習(xí)題 References 參考文獻 6 Performance of Digital Modulation over Wireless Channels 無線信道中數(shù)字調(diào)制的性能 6.1 AWGN Channels AWGN信道 6.1.1 Signal-to-Noise Power Ratio and Bit /Symbol Energy 信噪比和比特/符號能量 6.1.2 Error Probability for BPSK and QPSK BPSK和QPSK的差錯概率 6.1.3 Error Probability for MPSK MPSK的差錯概率 6.1.4 Error Probability for MPAM and MQAM MPAM和MQAM的差錯概率 6.1.5 Error Probability for FSK and CPFSK FSK和CPFSK的差錯概率 6.1.6 Error Probability Approximation for Coherent Modulations 相干調(diào)制的差錯概率的近似 6.1.7 Error Probability for Differential Modulation 差分調(diào)制的差錯概率 6.2 Alternate Q-Function Representation Q函數(shù)的一種等效表示法 6.3 Fading 衰落信道 6.3.1 Outage Probability 中斷率 6.3.2 Average Probability of Error 平均差錯概率 6.3.3 Moment Generating Function Approach to Average Error Probability 用矩母函數(shù)求平均差錯概率 6.3.4 Combined Outage and Average Error Probability 中斷率和平均差錯概率的結(jié)合 6.4 Doppler Spread 多普勒頻移 6.5 Intersymbol Interference 碼間干擾 Problems 習(xí)題 References 參考文獻 7 Diversity 分集 7.1 Realization of Independent Fading Paths 獨立衰落路徑的實現(xiàn) 7.2 Receiver Diversity 接收分集 7.2.1 System Model 系統(tǒng)模型 7.2.2 Selection Combining 選擇合并 7.2.3 Threshold Combining 閾值合并 7.2.4 Maximal-Ratio Combining 最大比合并 7.2.5 Equal-Gain Combining 等增益合并 7.3 Transmitter Diversity 發(fā)送分集 7.3.1 Channel Known at Transmitter 發(fā)送端已知信道 7.3.2 Channel Unknown at Transmitter – The Alamouti Scheme 發(fā)送端未知信道(Alamouti方案) 7.4 Moment Generating Functions in Diversity Analysis 利用矩母函數(shù)分析分集 7.4.1 Diversity Analysis for MRC MRC分集的分析 7.4.2 Diversity Analysis for EGC and SC EGC和SC分集的分析 7.4.3 Diversity Analysis for Noncoherent and Differentially Coherent Modulation 非相干和差分相干調(diào)制時分集系統(tǒng)的性能分析 Problems 習(xí)題 References 參考文獻 8 Coding for Wireless Channels 無線信道中的編碼 8.1 Overview of Code Design 碼設(shè)計概述 8.2 Linear Block Codes 線性分組碼 8.2.1 Binary Linear Block Codes 二進制線性分組碼 8.2.2 Generator Matrix 生成矩陣 8.2.3 Parity-Check Matrix and Syndrome Testing 校驗矩陣與伴隨式 8.2.4 Cyclic Codes 循環(huán)碼 8.2.5 Hard Decision Decoding (HDD) 硬判決譯碼 8.2.6 Probability of Error for HDD in AWGN AWGN信道中硬判決譯碼的差錯概率 8.2.7 Probability of Error for SDD in AWGN AWGN信道中軟判決譯碼的差錯概率 8.2.8 Common Linear Block Codes 常見的線性分組碼 8.2.9 Nonbinary Block Codes: The Reed Solomon Code 多進制分組碼:Reed Solomon碼 8.3 Convolutional Codes 卷積碼 8.3.1 Code Characterization: Trellis Diagrams 編碼特性:網(wǎng)格圖 8.3.2 Maximum Likelihood Decoding 最大似然譯碼 8.3.3 The Viterbi Algorithm 維特比算法 8.3.4 Distance Properties 距離特性 8.3.5 State Diagrams and Transfer Functions?狀態(tài)圖和轉(zhuǎn)移函數(shù) 8.3.6 Error Probability for Convolutional Codes 卷積碼的誤碼率 8.4 Concatenated Codes 級聯(lián)碼 8.5 Turbo Codes Turbo碼 8.6 Low-Density Parity-Check Codes 低密度校驗碼 8.7 Coded Modulation 編碼調(diào)制 8.8 Coding with Interleaving for Fading Channels 衰落信道下的交織編碼 8.8.1 Block Coding with Interleaving 分組碼的交織 8.8.2 Convolutional Coding with Interleaving 卷積碼的交織 8.8.3 Coded Modulation with Symbol/ Bit Interleaving 符號/比特交織的編碼調(diào)制 8.9 Unequal Error Protection Codes 不等差錯保護碼 8.10?Joint Source and Channel Coding 信源信道聯(lián)合編碼 Problems 習(xí)題 References 參考文獻 9 Adaptive Modulation and Coding 自適應(yīng)調(diào)制與編碼 9.1 Adaptive Transmission System 自適應(yīng)傳輸系統(tǒng) 9.2 Adaptive Techniques 自適應(yīng)技術(shù) 9.2.1 Variable-Rate Techniques 速率控制技術(shù) 9.2.2 Variable-Power Techniques 功率控制技術(shù) 9.2.3 Variable Error Probability 誤碼率控制技術(shù) 9.2.4 Variable-Coding Techniques 編碼控制技術(shù) 9.2.5 Hybrid Techniques 混合技術(shù) 9.3 Variable-Rate Variable-Power MQAM 速率可變、功率可變的MQAM 9.3.1 Error Probability Bounds 誤碼率界 9.3.2 Adaptive Rate and Power Schemes 自適應(yīng)速率及功率模式 9.3.3 Channel Inversion with Fixed Rate 固定速率的信道反轉(zhuǎn) 9.3.4 Discrete-Rate Adaptation 離散速率的自適應(yīng) 9.3.5 Average Fade Region Duration 衰落區(qū)的平均持續(xù)時間 9.3.6 Exact versus Approximate Bit Error Probability 誤比特率的精確值和近似值的對比 9.3.7 Channel Estimation Error and Delay 信道估計誤差和估計時延的影響 9.3.8 Adaptive Coded Modulation 自適應(yīng)編碼調(diào)制 9.4 General M-ary Modulations 一般的M進制調(diào)制 9.4.1 Continuous-Rate Adaptation 連續(xù)速率的自適應(yīng) 9.4.2 Discrete-Rate Adaptation 離散速率的自適應(yīng) 9.4.3 Average BER Target 平均BER目標(biāo) 9.5 Adaptive Techniques in Combined Fast and Slow Fading 結(jié)合快衰落和慢衰落的自適應(yīng)技術(shù) Problems 習(xí)題 References 參考文獻 10 Multiple Antennas and Space-Time Communications 多天線和空時通信 10.1 Narrowband MIMO Model 窄帶MIMO模型 10.2 Parallel Decomposition of the MIMO Channel MIMO信道的并行分解 10.3 MIMO Channel Capacity MIMO信道的容量 10.3.1 Static Channels 靜態(tài)信道 10.3.2 Fading Channels 衰落信道 10.4 MIMO Diversity Gain: Beamforming MIMO分集增益:波束成形 10.5 Diversity-Multiplexing Trade-offs 分集和復(fù)用的折中 10.6 Space-Time Modulation and Coding 空時調(diào)制與編碼 10.6.1 ML Detection and Pairwise Error Probability 最大似然檢測和成對差錯概率 10.6.2 Rank and Determinant Criteria 秩和行列式準(zhǔn)則 10.6.3 Space-Time Trellis and Block Codes 空時格碼和空時分組碼 10.6.4 Spatial Multiplexing and BLAST Architectures 空分復(fù)用和BLAST結(jié)構(gòu) 10.7 Frequency-Selective MIMO Channels 頻率選擇性MIMO信道 10.8 Smart Antennas 智能天線 Problems 習(xí)題 References 參考文獻 11 Equalization 均衡 11.1 Equalizer Noise Enhancement 均衡器中的噪聲增強 11.2 Equalizer Types 均衡器的類型 11.3 Folded Spectrum and ISI-Free Transmission 折疊譜和無ISI傳輸 11.4 Linear Equalizers 線性均衡 11.4.1 Zero-Forcing (ZF) Equalizers 迫零均衡 11.4.2 Minimum Mean-Square Error (MMSE) Equalizers 最小均方誤差均衡 11.5 Maximum Likelihood Sequence Estimation 最大似然序列估計 11.6 Decision-Feedback Equalization 判決反饋均衡 11.7 Other Equalization Methods 其他均衡方法 11.8 Adaptive Equalizers: Training and Tracking 自適應(yīng)均衡:訓(xùn)練和跟蹤 Problems 習(xí)題 References 參考文獻 12 Multicarrier Modulation 載波調(diào)制 12.1 Data Transmission Using Multiple Carriers 多載波數(shù)據(jù)傳輸 12.2 Multicarrier Modulation with Overlapping Subchannels 重疊子信道的多載波調(diào)制 12.3 Mitigation of Subcarrier Fading 子載波衰落的抑制 12.3.1 Coding with Interleaving over Time and Frequency 時頻域交織編碼 12.3.2 Frequency Equalization 頻域均衡 12.3.3 Precoding 預(yù)編碼 12.3.4 Adaptive Loading 自適應(yīng)加載 12.4 Discrete Implementation of Multicarrier Modulation 離散多載波調(diào)制的實現(xiàn) 12.4.1 The DFT and Its Properties DFT及其性質(zhì) 12.4.2 The Cyclic Prefix 循環(huán)前綴 12.4.3 Orthogonal Frequency-Division Multiplexing (OFDM) 正交頻分復(fù)用 12.4.4 Matrix Representation of OFDM OFDM的矩陣表示 12.4.5 Vector Coding 向量編碼 12.5 Challenges in Multicarrier Systems 多載波系統(tǒng)中的挑戰(zhàn) 12.5.1 Peak-to-Average Power Ratio 峰均比 12.5.2 Frequency and Timing Offset 頻率偏移和時間偏移 12.6 Case Study: The IEEE 802.11a Wireless LAN Standard 案例研究:IEEE 802.11a無線局域網(wǎng)標(biāo)準(zhǔn) Problems 習(xí)題 References 參考文獻 13 Spread Spectrum 擴頻 13.1 Spread-Spectrum Principles 擴頻原理 13.2 Direct-Sequence Spread Spectrum (DSSS) 直接序列擴頻 13.2.1 DSSS System Model DSSS系統(tǒng)模型 13.2.2 Spreading Codes for ISI Rejection: Random, Pseudorandom, and m-Sequences 抑制ISI的擴頻碼:隨機碼、偽隨機碼和m序列 13.2.3 Synchronization 同步 13.2.4 RAKE Receivers RAKE接收機 13.3 Frequency-Hopping Spread Spectrum (FHSS) 跳頻擴頻系統(tǒng) 13.4 Multiuser DSSS Systems 多用戶DSSS系統(tǒng) 13.4.1 Spreading Codes for Multiuser DSSS 多用戶DSSS系統(tǒng)中的擴頻碼 13.4.2 Downlink Channels 下行信道 13.4.3 Uplink Channels 上行信道 13.4.4 Multiuser Detection 多用戶檢測 13.4.5 Multicarrier CDMA 多載波CDMA 13.5 Multiuser FHSS Systems 多用戶FHSS系統(tǒng) Problems 習(xí)題 References 參考文獻 14 Multiuser Systems 多用戶系統(tǒng) 14.1 Multiuser Channels: The Uplink and Downlink 多用戶信道:上行與下行 14.2 Multiple Access 多址接入 14.2.1 Frequency-Division Multiple Access (FDMA) 頻分多址接入 14.2.2 Time-Division Multiple Access (TDMA) 時分多址接入 14.2.3 Code-Division Multiple Access (CDMA) 碼分多址接入 14.2.4 Space-Division Multiple Access (SDMA) 空分多址接入 14.2.5 Hybrid Techniques 混合多址接入 14.3 Random Access 隨機接入 14.3.1 Pure ALOHA 純ALOHA 14.3.2 Slotted ALOHA 時隙ALOHA 14.3.3 Carrier-Sense Multiple Access (CSMA) 載波監(jiān)聽多址接入 14.3.4 Scheduling 調(diào)度 14.4 Power Control 功率控制 14.5 Downlink (Broadcast) Channel Capacity 下行(廣播)信道容量 14.5.1 Channel Model 信道模型 14.5.2 Capacity in AWGN AWGN信道容量 14.5.3 Common Data 公共數(shù)據(jù) 14.5.4 Capacity in Fading 衰落信道容量 14.5.5 Capacity with Multiple Antennas 多天線容量 14.6 Uplink (Multiple Access) Channel Capacity 上行(多址)信道容量 14.6.1 Capacity in AWGN AWGN信道容量 14.6.2 Capacity in Fading 衰落信道容量 14.6.3 Capacity with Multiple Antennas 多天線容量 14.7 Uplink–Downlink Duality 上下行信道的對偶性 14.8 Multiuser Diversity 多用戶分集 14.9 MIMO Multiuser Systems MIMO多用戶系統(tǒng) Problems 習(xí)題 References 參考文獻 15 Cellular Systems and Infrastructure-Based Wireless Networks 蜂窩系統(tǒng)和架構(gòu)式無線網(wǎng)絡(luò) 15.1 Cellular System Fundamentals 蜂窩系統(tǒng)的基本概念 15.2 Channel Reuse 信道復(fù)用 15.3 SIR and User Capacity SIR和用戶容量 15.3.1 Orthogonal Systems (TDMA/FDMA) 正交系統(tǒng)(TDMA/FDMA) 15.3.2 Nonorthogonal Systems (CDMA) 非正交系統(tǒng) (CDMA) 15.4 Interference Reduction Techniques 抗干擾技術(shù) 15.5 Dynamic Resource Allocation 動態(tài)資源分配 15.5.1 Scheduling 調(diào)度 15.5.2 Dynamic Channel Assignment 動態(tài)信道分配 15.5.3 Power Control 功率控制 15.6 Fundamental Rate Limits 基本速率極限 15.6.1 Shannon Capacity of Cellular Systems 蜂窩系統(tǒng)的香農(nóng)容量 15.6.2 Area Spectral Efficiency 面積頻譜效率 Problems 習(xí)題 References 參考文獻 16 Ad Hoc Wireless Networks 無線自組織網(wǎng)絡(luò) 16.1 Applications 應(yīng)用 16.1.1 Data Networks 數(shù)據(jù)網(wǎng)絡(luò) 16.1.2 Home Networks 家庭網(wǎng)絡(luò) 16.1.3 Device Networks 設(shè)備網(wǎng)絡(luò) 16.1.4 Sensor Networks 傳感器網(wǎng)絡(luò) 16.1.5 Distributed Control Systems 分布式控制系統(tǒng) 16.2 Design Principles and Challenges 設(shè)計原則和挑戰(zhàn) 16.3 Protocol Layers 協(xié)議層 16.3.1 Physical Layer Design 物理層設(shè)計 16.3.2 Access Layer Design 接入層設(shè)計 16.3.3 Network Layer Design 網(wǎng)絡(luò)層設(shè)計 16.3.4 Transport Layer Design 傳輸層設(shè)計 16.3.5 Application Layer Design 應(yīng)用層設(shè)計 16.4 Cross-Layer Design 跨層設(shè)計 16.5 Network Capacity Limits 網(wǎng)絡(luò)的容量極限 16.6 Energy-Constrained Networks 能量受限網(wǎng)絡(luò) 16.6.1 Modulation and Coding 調(diào)制和編碼 16.6.2 MIMO and Cooperative MIMO MIMO及合作MIMO 16.6.3 Access, Routing, and Sleeping 接入、路由和休眠 16.6.4 Cross-Layer Design under Energy Constraints 能量約束下的跨層設(shè)計 16.6.5 Capacity per Unit Energy 單位能量的容量 Problems 習(xí)題 References 參考文獻 Appendix A Representation of Bandpass Signals and Channels 帶通信號和信道的表示 Appendix B Probability Theory, Random Variables, and Random Processes 概率論、隨機變量和隨機過程 Appendix C Matrix Definitions, Operations, and Properties 矩陣的定義、運算和性質(zhì) Appendix D Summary of Wireless Standards 無線標(biāo)準(zhǔn)摘要 Bibliography 參考書目 Index 索引
你還可能感興趣
我要評論
|