THE CENTER FOR COMMUNICATIONS AND SIGNAL PROCESSING RESEARCH and THE NORTH JERSEY CHAPTER OF THE IEEE COMMUNICATIONS SOCIETY present COMBINED DETECTION AND ESTIMATION IN WIRELESS COMMUNICATIONS* by STUART SCHWARTZ PRINCETON UNIVERSITY WHEN: Monday, May 6, 1996, 11:30 a.m. (refreshments at 11:15) WHERE: Room 202, Electrical and Computer Engineering Center New Jersey Institute of Technology ABSTRACT In an effort to overcome the impediments of fading, shadowing, and multiuser interference, and to increase user capacity in DS/CDMA wireless communication systems, a number of processing techniques have been proposed. These include both spatial (multiple antenna) and temporal processing. For the latter, the primary approaches have been multipath resolution, equalization, multiuser detection, and coding. The basic goal of all these approaches, in one way or another, is to eliminate or at least substantially attenuate multiuser interference and to coherently combine a particular user's received signals. To effectively exploit these techniques and achieve significant gains in user capacity, a variety of model parameters must be assumed known or estimated. These typically include user amplitudes, phase and delay, PN codes, and sensor phase offset (if multiple antennas are utilized). An alternative is to sequence the processing techniques in such a way as to make the receiver more robust, i.e., make the performance less sensitive to parameter mismatch. In this talk, we will review some of the estimation procedures developed for a multiuser communication environment and will present a number of combined joint estimation-detection procedures. We then introduce detector structures that have more robust performance. In particular, we discuss a new structure that consists of a decorrelator and multipath combiner. This detector turns out to be robust against the interfering user's parameter mismatches and power levels. In addition, the detector provides a set of sufficient statistics which lead to linear minimum variance unbiased estimates for the desired user's amplitudes, phase and sensor offset. Simulations are presented that illustrate the robustness of the detector in the face of parameter mismatch. *Joint work with Howard Huang, Lucent Technologies. BIOGRAPHY Stuart C. Schwartz received the B.S. and M.S. degrees from M.I.T. in 1961 and the Ph.D. from the University of Michigan in 1966. He is presently a professor of electrical engineering at Princeton University. He was chair of the department from 1985 to 1994, and served as associate dean of the School of Engineering from 1977 to 1980. He was a John S. Guggenheim Fellow during the academic year 1972-73. He has held visiting appointments at the Technion, Haifa, Israel (1972-73), Bell Telephone Laboratories, Crawford Hill (1980-81), Dartmouth and Berkeley (1989-90), and ETH, Zurich (1995). His principal research interests are in statistical communication theory and signal processing. PLEASE POST For more info. contact N. Ansari, (201) 596-3670, ang@faraday.njit.edu; or Z. Siveski, (201) 596-5710, zoran@hertz.njit.edu WWW: http://hertz.njit.edu/~ieeenj TRAVEL DIRECTIONS TO NEW JERSEY INSTITUTE OF TECHNOLOGY By Car GARDEN STATE PARKWAY (GSP): Take Exit 145 to Route 280 East, then follow Route 280 East directions. NEW JERSEY TURNPIKE: Take Exit 15W to Route 280 West, then follow 280 West directions. ROUTE 280 WEST: Take Exit 15 (Route 21, Newark) immediately after the William Stickel Memorial Bridge. At light at foot of ramp, make a soft left onto University Avenue. At fourth light, make a right on Central Avenue. Go through light at King Blvd. Make first left after light on Summit Street to arrive at the NJIT campus. ROUTE 280 EAST: Take Exit 14A, King Blvd. Make a right at the light at the foot of the ramp. Bear right through the first light, staying on King Blvd. Go two more lights and make a right on Central Avenue. Make first left on Summit Street to arrive at the NJIT campus. ROUTE 1 & 9 NORTH AND SOUTH: Take exit marked Newark, Route 21 (McCarter Highway). Cross bridge. At light at end of bridge, make quick left then quick right for Broad Street. (There are clear signs for Broad Street.) Go about 1 mile. Make a left on Court Street. Make right at third light on King Blvd. Make left at sixth light on Central Avenue. Make first left on Summit Street to arrive at the NJIT campus. ROUTE 78: Take Route 78 to the Garden State Parkway. Follow GSP directions. ROUTE 22: Take Route 22 to Route 21 North. Follow directions for Route 21 North. ROUTE 21 NORTH: Cross bridge. At light at end of bridge, make quick left then quick right for Broad Street. (There are clear signs for Broad Street.) Go about 1 mile. Make a left on Court Street. Make right at third light on King Blvd. Make left at sixth light on Central Avenue. Make first left on Summit Street to arrive at the NJIT campus. ROUTE 21 SOUTH: Make a right on Market Street. Bear right at fork. Make right at top of hill on King Blvd. At second light make a left on Central Avenue. Make first left on Summit Street to arrive at the NJIT campus. NEW YORK THRUWAY: Thruway to Exit 14A, Garden State Parkway. Follow GSP directions. GEORGE WASHINGTON BRIDGE: NJ Turnpike South to Exit 15W. Follow Route 280 West directions. LINCOLN TUNNEL: West on Route 3 to NJ Turnpike South to Exit 15W. Follow Route 280 West directions. Other Transportation Systems NEWARK INTERNATIONAL AIRPORT: Five miles from the NJIT campus. A minibus (Newark Airlink) or taxi service connects the airport with Penn Station in Newark. Bus, city subway, and taxi connections may be obtained at the station. NEWARK PENN STATION: Connections to the NJIT campus may be made by bus, city subway, or taxi. MORRIS & ESSEX BROAD STREET STATION: A five block walk to the NJIT campus via King Blvd. to Central Avenue. Taxi service is also available. NEWARK CITY SUBWAY: From Penn Station in Newark, take the Warren Street stop for the NJIT campus.