UCBC UCSC Broadband Communications (UCBC) Research Group Hamid R. Sadjadpour April 2004 Space-Time Signal Processing for Wireless Ad-hoc Networks.

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Presentation transcript:

UCBC UCSC Broadband Communications (UCBC) Research Group Hamid R. Sadjadpour April 2004 Space-Time Signal Processing for Wireless Ad-hoc Networks

UCBC Wireless (Ad-hoc) Networks: Challenges Group of nodes communicate with the base station or each other over a common wireless channel. Interference is one of the limiting factors in such environment. Fading is another limiting factor for reliable communications. Future wireless applications require high throughput for such networks.

UCBC Wireless (Ad-hoc) Networks: Challenges

UCBC Wireless (Ad-hoc) Networks: Solutions The use of multiple antennas at both transmitter and receiver. Foschini & Gans (98), Teletar (99): Multiple Tx/Rx antennas can increase capacity of wireless channels significantly. Space-time signal processing is the solution to achieve high data rates. Many practical communication devices can not carry multiple antennas or at least the same number of antennas as base station.

UCBC Talk summary Part I: Packet transmission in wireless ad-hoc networks. Part II: Space-time processing for uplink of wireless communications systems. Part III: Future research in space-time signal processing for mobile wireless networks.

UCBC Packet Transmission in Wireless Networks Gupta & Kumar (2000): Capacity per source- destination of fixed ad-hoc wireless networks goes to zero! Grossglauser & Tse (2002): Capacity per source- destination of mobile ad-hoc wireless networks goes to a constant using multiuser diversity. Problem: Infinite delay even with finite number of nodes in the network. Cumulative density delay function with uniform distribution of nodes

UCBC Packet Transmission in Wireless Networks

UCBC Packet Transmission in Wireless Networks

UCBC Packet Transmission in Wireless Networks

UCBC Packet Transmission in Wireless Networks

UCBC Packet Transmission in Wireless Networks

UCBC Packet Transmission in Wireless Networks

UCBC Packet Transmission in Wireless Networks

UCBC Packet Transmission in Wireless Networks

UCBC Packet Transmission in Wireless Networks

UCBC Packet Transmission in Wireless Networks

UCBC STC in Wireless Networks: Challenges To achieve high data rates we need multiple antennas at both ends. Many mobile units are not capable of carrying multiple antennas. In some cases, they only have a single transmit antenna. Is there any solution when there is a single transmit antenna? Cooperation diversity. Can we do it without the need for multiple transmit antennas or using cooperation diversity? Yes!!

UCBC STC in Wireless Networks Tx1 Tx2 Rx1 Rx2

UCBC STC in Wireless Networks Space-time Convolutional codes for 4 states, Rayleigh fading channel

UCBC STC in Wireless Networks Space-time Convolutional codes for 16 states, Rayleigh fading channel

UCBC STC in Wireless Networks STC for 4 states, Rician fading channel, k=0 dB

UCBC STC in Wireless Networks STC for 16 states, Rician fading channel, k=0 dB

UCBC STC in Wireless Networks STC for 4 states, Rician fading channel, k=6 dB

UCBC STC in Wireless Networks STC for 16 states, Rician fading channel, k=6 dB

UCBC STC in Wireless Networks

UCBC Current Activities at UCBC ML decoding of linear block code for application to Turbo block codes. Adaptive coding and modulation for OFDM systems. Coding and Signal processing for fiber optic channels (PMD compensation). Tradeoff studies between capacity and delay in various networks.