Base station for use in a CDMA communication system using an antenna array

• US 6,983,008 B2
• Filed: 02/06/2002
• Issued: 01/03/2006
• Est. Priority Date: 09/10/1999
• Status: Expired due to Term

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Mesecher, David K.
• Primary Examiner(s): Ghebretinsae, Temesghen
• Application Number:
  US10/068,718
• Publication Number:
  US 20020094016A1
• Time in Patent Office: 1,427 Days
• Field of Search: 375/130, 375/146, 375/295, 375/267, 375/347, 375/299, 375/141, 375/144, 370/335, 370/342
• US Class Current: 375/130
• CPC Class Codes: H04B 1/712 Weighting of fingers for combining, e.g. amplitude control or phase rotation using an inner loop
• CPC Class Codes: H04B 2201/70701 featuring pilot assisted reception
• CPC Class Codes: H04B 7/0613 using simultaneous transmission H04B7/0686 takes precedence
• CPC Class Codes: H04B 7/0615 of weighted versions of same signal
• CPC Class Codes: H04B 7/0619 using feedback from receiving side feedback signaling for adaptive modulation/coding H04L1/0001
• CPC Class Codes: H04B 7/0634 Antenna weights or vector/matrix coefficients
• CPC Class Codes: H04B 7/0678 using different spreading codes between antennas code allocation H04J13/16
• CPC Class Codes: H04B 7/0845 per branch equalization, e.g. by an FIR-filter or RAKE receiver per antenna branch rake receivers as such H04B1/7115
• CPC Class Codes: H04B 7/0854 using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
• CPC Class Codes: H04B 7/0857 using maximum ratio combining techniques, e.g. signal-to- interference ratio [SIR], received signal strenght indication [RSS]
• CPC Class Codes: H04B 7/0891 Space-time diversity rake receivers H04B1/7115; space-time decoding H04L1/0631
• CPC Class Codes: H04J 13/0003 Code application, i.e. aspects relating to how codes are applied to form multiplexed channels

Abstract

A base station has a plurality of transmitting antennas. From each transmitting antenna, a reference signal having a code uniquely associated with that antenna is transmitted. A data signal is transmitted such that different spread spectrum versions of the data signal are transmitted from each antenna. Each version has a different code for the respective transmitting antenna.

Claims

1. A base station having a plurality of transmitting antennas, the base station comprising:

means for transmitting from each transmitting antenna, a reference signal having a code uniquely associated with that antenna, wherein the transmitted reference signals are not delayed with respect to each other; and

means for transmitting a data signal such that different spread spectrum versions of the data signal are transmitted from each antenna, each data signal version having a different code for the respective transmitting antenna and the data signal versions are not transmission channel compensation processed; and

wherein the base station transmissions are in a time division duplex format and weights derived from received versions of the reference signals are used to weight received versions of the data signal versions prior to combining the weighted received data signal versions.

2. The base station of claim 1 wherein the means for transmitting a data signal transmits a plurality of data signals, such that spread spectrum versions of each data signal are transmitted from each antenna, each version having a different code for the respective transmitting antenna.

3. The base station of claim 2 wherein each version has a different code than the code for any of the versions of the plurality of data signals.

4. A base station comprising:

a plurality of transmitting antennas for transmitting a plurality of reference signals and data signal versions, each transmitting antenna operatively coupled to a reference signal generator and a mixer, wherein the transmitted reference signals are not delayed with respect to each other and the data signal versions are not transmission channel compensation processed;

a plurality of reference signal generators, each reference signal generator generating a code uniquely associated with its operatively coupled to antenna;

a data signal generator for producing a data signal; and

a plurality of mixers for producing the plurality of the data signal versions, each mixer for mixing the data signal with a different code to produce one of the versions for that mixer'"'"'s coupled to antenna; and

wherein the base stations transmissions are in a time division duplex format and weights derived from received versions of the reference signals are used to weight received versions of the data signal versions prior to combining the weighted received data signal versions.

5. The base station of claim 4 further comprising at least one additional data signal generator for producing at least one additional data signal;

for each at least one additional data signal generator, a plurality of mixers for producing a plurality of versions of that at least one additional data signal, each version having a different code for transmission over a respective transmitting antenna of the transmitting antennas.