lecture.2.pdf

Broadband Communication Networks Assoc.Prof.Dr.ibrahim khider September 2021  Lecture 2 Background on Wireless Channels and Digital Broadband Enablers  Wireless Channel The wireless channel is affected by th following issues Pathloss Shadowing...

Broadband Communication Networks Assoc.Prof.Dr.ibrahim khider September 2021  Lecture 2 Background on Wireless Channels and Digital Broadband Enablers  Wireless Channel The wireless channel is affected by th following issues Pathloss Shadowing Fading – Flat or frequency selective – slow or fast Wireless Channel Pathloss Wireless Channel Pathloss Wireless Channel Pathloss Wireless Channel Pathloss  Wireless Channel Shadowing and Fading  Wireless Channel Flat Fading Channels  Wireless Channel Frequency-Selective Fading Channels  Wireless Channel Frequency-Selective Fading Channels Information Theoretic Aspects Shannon limit A Review of Digital Modulation Schemes  A Review of Digital Modulation Schemes Digital modulation is ideally suited to a multitude of communications applications, including both cable and wireless systems. Applications include the following: relatively low-speed voice-band datacommunications modems, such as found in most personal computers high-speed data transmission systems, such as broadband digital subscriber lines (DSL) digital microwave and satellite communications systems cellular networks  Multiple Access Techniques Frequency-Division Multiple Access  Multiple Access Techniques Frequency-Division Multiple Access  Multiple Access Techniques Time Division Multiple Access (TDMA  Multiple Access Techniques Time Division Multiple Access (TDMA  Multiple Access Techniques Time Division Multiple Access (TDMA  Multiple Access Techniques Code Division Multiple Access (CDMA)  Multiple Access Techniques Code Division Multiple Access (CDMA