This an adaptive receiver for a direct-sequence spread spectrum (DS-SS) system over an AWGN channel. The adaptive receiver block is modified from the LMS adaptive filter block in DSP Blockset. For DS-SS signal reception, the adaptive filter needs to have multi-rate operation. The input sample rate is equal to chip rate and the output is at symbol rate. Two rates are related by PG, processing gain
標(biāo)簽: direct-sequence adaptive receiver spectrum
上傳時(shí)間: 2014-01-16
上傳用戶:D&L37
RAKE receiver for direct-sequence spread spectrum systems Simulink model of a simple direct-sequence spread spectrum system with RAKE reception
標(biāo)簽: direct-sequence direct-sequenc receiver Simulink
上傳時(shí)間: 2014-01-05
上傳用戶:lunshaomo
Simulation of Direct Sequence Spread Spectrum Communication System Based on MATLAB
標(biāo)簽: Communication Simulation Sequence Spectrum
上傳時(shí)間: 2014-01-21
上傳用戶:釣鰲牧馬
Direct Sequence Spread Spectrum
標(biāo)簽: Sequence Spectrum Direct Spread
上傳時(shí)間: 2014-01-23
上傳用戶:xinzhch
direct sequence spread spectrum
標(biāo)簽: sequence spectrum direct spread
上傳時(shí)間: 2017-04-16
上傳用戶:qiao8960
很多不同的廠家生產(chǎn)各種型號(hào)的計(jì)算機(jī),它們運(yùn)行完全不同的操作系統(tǒng),但TCP.IP協(xié)議族允許它們互相進(jìn)行通信。這一點(diǎn)很讓人感到吃驚,因?yàn)樗淖饔靡堰h(yuǎn)遠(yuǎn)超出了起初的設(shè)想。T C P / I P起源于6 0年代末美國政府資助的一個(gè)分組交換網(wǎng)絡(luò)研究項(xiàng)目,到9 0年代已發(fā)展成為計(jì)算機(jī)之間最常應(yīng)用的組網(wǎng)形式。它是一個(gè)真正的開放系統(tǒng),因?yàn)閰f(xié)議族的定義及其多種實(shí)現(xiàn)可以不用花錢或花很少的錢就可以公開地得到。它成為被稱作“全球互聯(lián)網(wǎng)”或“因特網(wǎng)(Internet)”的基礎(chǔ),該廣域網(wǎng)(WA N)已包含超過1 0 0萬臺(tái)遍布世界各地的計(jì)算機(jī)。本章主要對(duì)T C P / I P協(xié)議族進(jìn)行概述,其目的是為本書其余章節(jié)提供充分的背景知識(shí)。 TCP.IP協(xié)議 縮略語 ACK (ACKnowledgment) TCP首部中的確認(rèn)標(biāo)志 API (Application Programming Interface) 應(yīng)用編程接口 ARP (Address Resolution Protocol) 地址解析協(xié)議 ARPANET(Defense Advanced Research Project Agency NETwork) (美國)國防部遠(yuǎn)景研究規(guī)劃局 AS (Autonomous System) 自治系統(tǒng) ASCII (American Standard Code for Information Interchange) 美國信息交換標(biāo)準(zhǔn)碼 ASN.1 (Abstract Syntax Notation One) 抽象語法記法1 BER (Basic Encoding Rule) 基本編碼規(guī)則 BGP (Border Gateway Protocol) 邊界網(wǎng)關(guān)協(xié)議 BIND (Berkeley Internet Name Domain) 伯克利I n t e r n e t域名 BOOTP (BOOTstrap Protocol) 引導(dǎo)程序協(xié)議 BPF (BSD Packet Filter) BSD 分組過濾器 CIDR (Classless InterDomain Routing) 無類型域間選路 CIX (Commercial Internet Exchange) 商業(yè)互聯(lián)網(wǎng)交換 CLNP (ConnectionLess Network Protocol) 無連接網(wǎng)絡(luò)協(xié)議 CRC (Cyclic Redundancy Check) 循環(huán)冗余檢驗(yàn) CSLIP (Compressed SLIP) 壓縮的S L I P CSMA (Carrier Sense Multiple Access) 載波偵聽多路存取 DCE (Data Circuit-terminating Equipment) 數(shù)據(jù)電路端接設(shè)備 DDN (Defense Data Network) 國防數(shù)據(jù)網(wǎng) DF (Don’t Fragment) IP首部中的不分片標(biāo)志 DHCP (Dynamic Host Configuration Protocol) 動(dòng)態(tài)主機(jī)配置協(xié)議 DLPI (Data Link Provider Interface) 數(shù)據(jù)鏈路提供者接口 DNS (Domain Name System) 域名系統(tǒng) DSAP (Destination Service Access Point) 目的服務(wù)訪問點(diǎn) DSLAM (DSL Access Multiplexer) 數(shù)字用戶線接入復(fù)用器 DSSS (Direct Sequence Spread Spectrum) 直接序列擴(kuò)頻 DTS (Distributed Time Service) 分布式時(shí)間服務(wù) DVMRP (Distance Vector Multicast Routing Protocol) 距離向量多播選路協(xié)議 EBONE (European IP BackbONE) 歐洲I P主干網(wǎng) EOL (End of Option List) 選項(xiàng)清單結(jié)束 EGP (External Gateway Protocol) 外部網(wǎng)關(guān)協(xié)議 EIA (Electronic Industries Association) 美國電子工業(yè)協(xié)會(huì) FCS (Frame Check Sequence) 幀檢驗(yàn)序列 FDDI (Fiber Distributed Data Interface) 光纖分布式數(shù)據(jù)接口 FIFO (First In, First Out) 先進(jìn)先出 FIN (FINish) TCP首部中的結(jié)束標(biāo)志 FQDN (Full Qualified Domain Name) 完全合格的域名 FTP (File Transfer Protocol) 文件傳送協(xié)議 HDLC (High-level Data Link Control) 高級(jí)數(shù)據(jù)鏈路控制 HELLO 選路協(xié)議 IAB (Internet Architecture Board) Internet體系結(jié)構(gòu)委員會(huì) IANA (Internet Assigned Numbers Authority) Internet號(hào)分配機(jī)構(gòu) ICMP (Internet Control Message Protocol) Internet控制報(bào)文協(xié)議 IDRP (InterDomain Routing Protocol) 域間選路協(xié)議 IEEE (Institute of Electrical and Electronics Engineering) (美國)電氣與電子工程師協(xié)會(huì) IEN (Internet Experiment Notes) 互聯(lián)網(wǎng)試驗(yàn)注釋 IESG (Internet Engineering Steering Group) Internet工程指導(dǎo)小組 IETF (Internet Engineering Task Force) Internet工程專門小組 IGMP (Internet Group Management Protocol) Internet組管理協(xié)議 IGP (Interior Gateway Protocol) 內(nèi)部網(wǎng)關(guān)協(xié)議 IMAP (Internet Message Access Protocol) Internet報(bào)文存取協(xié)議 IP (Internet Protocol) 網(wǎng)際協(xié)議 I RTF (Internet Research Task Force) Internet研究專門小組 IS-IS (Intermediate System to Intermediate System Protocol) 中間系統(tǒng)到中間系統(tǒng)協(xié)議 ISN (Initial Sequence Number) 初始序號(hào) ISO (International Organization for Standardization) 國際標(biāo)準(zhǔn)化組織 ISOC (Internet SOCiety) Internet協(xié)會(huì) LAN (Local Area Network) 局域網(wǎng) LBX (Low Bandwidth X) 低帶寬X LCP (Link Control Protocol) 鏈路控制協(xié)議 LFN (Long Fat Net) 長(zhǎng)肥網(wǎng)絡(luò) LIFO (Last In, First Out) 后進(jìn)先出 LLC (Logical Link Control) 邏輯鏈路控制 LSRR (Loose Source and Record Route) 寬松的源站及記錄路由 MBONE (Multicast Backbone On the InterNEt) Internet上的多播主干網(wǎng) MIB (Management Information Base) 管理信息庫 MILNET (MILitary NETwork) 軍用網(wǎng) MIME (Multipurpose Internet Mail Extensions) 通用I n t e r n e t郵件擴(kuò)充 MSL (Maximum Segment Lifetime) 報(bào)文段最大生存時(shí)間 MSS (Maximum Segment Size) 最大報(bào)文段長(zhǎng)度 M TA (Message Transfer Agent) 報(bào)文傳送代理 MTU (Maximum Transmission Unit) 最大傳輸單元 NCP (Network Control Protocol) 網(wǎng)絡(luò)控制協(xié)議 NFS (Network File System) 網(wǎng)絡(luò)文件系統(tǒng) NIC (Network Information Center) 網(wǎng)絡(luò)信息中心 NIT (Network Interface Tap) 網(wǎng)絡(luò)接口栓(S u n公司的一個(gè)程序) NNTP (Network News Transfer Protocol) 網(wǎng)絡(luò)新聞傳送協(xié)議 NOAO (National Optical Astronomy Observatories) 國家光學(xué)天文臺(tái) NOP (No Operation) 無操作 NSFNET (National Science Foundation NETwork) 國家科學(xué)基金網(wǎng)絡(luò) NSI (NASA Science Internet) (美國)國家宇航局I n t e r n e t NTP (Network Time Protocol) 網(wǎng)絡(luò)時(shí)間協(xié)議 NVT (Network Virtual Terminal) 網(wǎng)絡(luò)虛擬終端 OSF (Open Software Foudation) 開放軟件基金 OSI (Open Systems Interconnection) 開放系統(tǒng)互連 OSPF (Open Shortest Path First) 開放最短通路優(yōu)先 PAWS (Protection Against Wrapped Sequence number) 防止回繞的序號(hào) PDU (Protocol Data Unit) 協(xié)議數(shù)據(jù)單元 POSIX (Portable Operating System Interface) 可移植操作系統(tǒng)接口 PPP (Point-to-Point Protocol) 點(diǎn)對(duì)點(diǎn)協(xié)議 PSH (PuSH) TCP首部中的急迫標(biāo)志 RARP (Reverse Address Resolution Protocol) 逆地址解析協(xié)議 RFC (Request For Comments) Internet的文檔,其中的少部分成為標(biāo)準(zhǔn)文檔 RIP (Routing Information Protocol) 路由信息協(xié)議 RPC (Remote Procedure Call) 遠(yuǎn)程過程調(diào)用 RR (Resource Record) 資源記錄 RST (ReSeT) TCP首部中的復(fù)位標(biāo)志 RTO (Retransmission Time Out) 重傳超時(shí) RTT (Round-Trip Time) 往返時(shí)間 SACK (Selective ACKnowledgment) 有選擇的確認(rèn) SLIP (Serial Line Internet Protocol) 串行線路I n t e r n e t協(xié)議 SMI (Structure of Management Information) 管理信息結(jié)構(gòu) SMTP (Simple Mail Transfer Protocol) 簡(jiǎn)單郵件傳送協(xié)議 SNMP (Simple Network Management Protocol) 簡(jiǎn)單網(wǎng)絡(luò)管理協(xié)議 SSAP (Source Service Access Point) 源服務(wù)訪問點(diǎn) SSRR (Strict Source and Record Route) 嚴(yán)格的源站及記錄路由 SWS (Silly Window Syndrome) 糊涂窗口綜合癥 SYN (SYNchronous) TCP首部中的同步序號(hào)標(biāo)志 TCP (Transmission Control Protocol) 傳輸控制協(xié)議 TFTP (Trivial File Transfer Protocol) 簡(jiǎn)單文件傳送協(xié)議 TLI (Transport Layer Interface) 運(yùn)輸層接口 TTL (Ti m e - To-Live) 生存時(shí)間或壽命 TUBA (TCP and UDP with Bigger Addresses) 具有更長(zhǎng)地址的T C P和U D P Telnet 遠(yuǎn)程終端協(xié)議 UA (User Agent) 用戶代理 UDP (User Datagram Protocol) 用戶數(shù)據(jù)報(bào)協(xié)議 URG (URGent) TCP首部中的緊急指針標(biāo)志 UTC (Coordinated Universal Time) 協(xié)調(diào)的統(tǒng)一時(shí)間 UUCP (Unix-to-Unix CoPy) Unix到U n i x的復(fù)制 WAN (Wide Area Network) 廣域網(wǎng) WWW (World Wide Web) 萬維網(wǎng) XDR (eXternal Data Representation) 外部數(shù)據(jù)表示 XID (transaction ID) 事務(wù)標(biāo)識(shí)符 XTI (X/Open Transport Layer Interface) X/ O p e n運(yùn)輸層接口
上傳時(shí)間: 2013-11-13
上傳用戶:tdyoung
We simulate uncoded BER of BPSK modulated data as a function of SNR -in an AWGN channel -in a Rayleigh fading channel -in an AWGN channel when direct sequence spreading is used and compare results to the theoretical ones. We assume coherent receiver and perfect synchronization.
標(biāo)簽: modulated simulate function channel
上傳時(shí)間: 2014-01-11
上傳用戶:1109003457
SPREAD SPECTRUM MODULATION TECHNIQUES -spread spectrum - those modulation methods that are producing a signal whose spectrum is more wider than of the data signal, the occupied frequency band being independent by the signal of data band. -The signals with spread spectrum of direct sequence type BPSK (BPSK-DS-SS) -The signals with spread spectrum of direct sequence type QPSK – DS–SS - Frequency hopping spread spectrum signals (FH-SS)
標(biāo)簽: MODULATION TECHNIQUES modulation SPECTRUM
上傳時(shí)間: 2017-06-05
上傳用戶:lht618
In 揚(yáng)erformance of multi-carrier DS CDMA Systems?we apply a multi-carrier signaling technique to a direct-sequence CDMA system, where a data sequence multiplied by a spreading sequence modulates multiple carriers, rather than a single carrier. The receiver provides a correlator for each carrier, and the outputs of the correlators are combined with a maximal-ratio combiner. This type of signaling has the desirable properties of exhibiting a narrowband interference suppression effect, along with robustness to fading, without requiring the use of either an explicit RAKE structure or an interference suppression filter.
標(biāo)簽: multi-carrier erformance signaling technique
上傳時(shí)間: 2017-07-31
上傳用戶:宋桃子
解讀 5G 八大關(guān)鍵技術(shù) 【摘要】5G 不是一次革命,5G 是 4G 的延續(xù),我相信 5G 在核心網(wǎng)部分不會(huì)有太 大的變動(dòng),5G 的關(guān)鍵技術(shù)集中在無線部分。 在進(jìn)入主題之前,我覺得首先應(yīng)該弄清楚一個(gè)問題:為什么需要 5G?不是因 為通信工程師們突然想改變世界,而炮制了一個(gè) 5G。是因?yàn)橄扔辛诵枨螅庞辛?5G。什么需求? 未來的網(wǎng)絡(luò)將會(huì)面對(duì):1000 倍的數(shù)據(jù)容量增長(zhǎng),10 到 100 倍的無線設(shè)備連接, 10 到 100 倍的用戶速率需求,10 倍長(zhǎng)的電池續(xù)航時(shí)間需求等等。坦白的講,4G 網(wǎng)絡(luò)無法滿足這些需求,所以 5G 就必須登場(chǎng)。 但是,5G 不是一次革命。5G 是 4G 的延續(xù),我相信 5G 在核心網(wǎng)部分不會(huì)有 太大的變動(dòng),5G 的關(guān)鍵技術(shù)集中在無線部分。雖然 5G 最終將采用何種技術(shù),目前 還沒有定論。不過,綜合各大高端論壇討論的焦點(diǎn),我今天收集了 8 大關(guān)鍵技術(shù)。 當(dāng)然,應(yīng)該遠(yuǎn)不止這些。 1.非正交多址接入技術(shù) (Non-Orthogonal Multiple Access,NOMA) 我們知道 3G 采用直接序列碼分多址(Direct Sequence CDMA ,DS-CDMA) 技術(shù),手機(jī)接收端使用 Rake 接收器,由于其非正交特性,就得使用快速功率控制 (Fast transmission power control ,TPC)來解決手機(jī)和小區(qū)之間的遠(yuǎn)-近問題。 而 4G 網(wǎng)絡(luò)則采用正交頻分多址(
標(biāo)簽: 5G
上傳時(shí)間: 2022-02-25
上傳用戶:20125101110
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