Wireless mobile station receiver structure with smart antenna

• US 6,137,785 A
• Filed: 03/17/1998
• Issued: 10/24/2000
• Est. Priority Date: 03/17/1998
• Status: Expired due to Term

• Current Assignee: New Jersey Institute of Technology
• Original Assignee: New Jersey Institute of Technology
• Inventors: Bar-Ness, Yeheskel
• Primary Examiner(s): VU, HUY DUY
• Application Number:
  US09/042,948
• Time in Patent Office: 952 Days
• Field of Search: 375/346, 375/347, 375/348, 375/349, 455/67.3, 455/67.1, 455/63, 455/524, 455/525, 455/501, 455/517, 455/575, 455/132, 370/252, 370/241, 370/334, 370/328, 370/342, 370/343, 370/345, 370/310
• US Class Current: 370/328
• CPC Class Codes: H01Q 1/241 used in mobile communications, e.g. GSM H01Q1/247, H01Q1/248 take precedence
• CPC Class Codes: H01Q 3/2611 Means for null steering; Adaptive interference nulling
• CPC Class Codes: H04B 7/0891 Space-time diversity rake receivers H04B1/7115; space-time decoding H04L1/0631

Abstract

This invention relates to a system and method utilizing a receiver architecture with a set of at least two antennae followed by a Rake demodulator at a mobile station for interference cancellation and diversity combining. Such a structure can work well only when the channel vector of desired signal is correctly estimated. The present invention makes use of the identifying spreading codes (as in IS-95 for example) to provide an adaptive channel vector estimate, to thereby cancel cochannel interference and improve the system capacity.

Claims

1. An apparatus for reducing neighboring base station interference in a wireless mobile station which receives a signal transmitted from a home base station, said apparatus comprising:

(a) at least two antennas;

(b) a means for correction that continually corrects a channel vector model of the received signal by utilizing an antenna hybrid device and a pilot signal received from the home base station in order to process the output signal of each antenna;

(c) an interference cancellation means for using the corrected channel vector model to adaptively control cancellation weights;

(d) a despreading means for despreading a signal obtained from the output of the antenna hybrid device;

(e) an accumulator means for accumulating the output of the despreading means over one symbol interval; and

,

(f) a respreading means to respread the accumulator results to yield a reference signal.

2. The apparatus of claim 1 wherein said correction means further comprises a control signal generating means for generating a control signal using said reference signal.

3. The apparatus of claim 2 wherein said cancellation means comprises a complex weight controller using said control signal to update said cancellation weights.

4. The apparatus of claim 3 wherein said correction means comprises a means for utilizing a spread code transmitted in a IS-95 CDMA signaling system.

5. The apparatus of claim 3 wherein the received signal is a BPSK signal.

6. The apparatus of claim 3 wherein the received signal is a QPSK signal.

7. The apparatus of claim 3 wherein the received signal is a Time Domain Multiple Access (TDMA) signal.

8. The apparatus of claim 3 wherein the received signal is a Frequency Domain Multiple Access (FDMA) signal.

9. The apparatus of claim 3 wherein the interference cancellation means comprises a means for utilizing spatial information.

10. The apparatus of claim 3 wherein the interference cancellation means comprises a means for utilizing polarization information.

11. An apparatus for reducing neighboring base station interference in a wireless mobile station receiving a signal transmitted from a home base station, said apparatus comprising:

(a) at least two antennas;

(b) means for using a pilot signal received from the home base station and an antenna hybrid device to continually correct a channel vector model of the received signal; and

,

(c) an interference cancellation means for using the corrected channel vector model to adaptively control cancellation weights.