Code division multiple access transmission antenna weighting

• US 9,219,522 B2
• Filed: 10/11/2010
• Issued: 12/22/2015
• Est. Priority Date: 09/10/1999
• Status: Expired due to Fees

• Current Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Original Assignee: Interdigital Technology Corporation (InterDigital, Inc.)
• Inventors: Mesecher, David K.
• Primary Examiner(s): Bocure, Tesfaldet
• Application Number:
  US12/901,616
• Publication Number:
  US 20110026496A1
• Time in Patent Office: 1,898 Days
• Field of Search: 375/130, 375/140, 375/141, 375/144, 375145-148, 375/267.M, 375/299, 375/295, 375/316, 375/346, 375/347, 375/267, 370/335, 370/342, 370/441, 455/39, 455/73, 455/91, 455/101, 455132-135, 455/136, 455/137
• US Class Current: 1/1
• 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 code division multiple access communication system has a base station with a plurality of transmitting antennas. From each transmitting antenna of the base station, a pilot signal is transmitted having a different chip sequence than the other transmitting antenna. At a user equipment, the transmitted pilot signals are received from each transmitting antenna. A weight adjustment is derived in response to the received transmitted pilot signals. The user equipment transmits the weight adjustment to the base station. The transmitted weight adjustment is received from the user equipment. A data signal is processed to produce a plurality of versions of the data signal. At least a portion of each processed data signal has a different chip sequence than the other processed data signal version. At least one processed data signal version is weighted by a weight value adjusted in response to the received transmitted weight adjustment. From each transmitting antenna, a different one of the data signal versions is transmitted and the transmitted data signal versions are received at the user equipment.

Claims

1. A receiving device comprising:

circuitry configured to receive a signal including pilot bits transmitted by a plurality of antennas;

wherein the received signal includes a single user data that was combined with different sequences producing a quality of combined data sequences;

wherein antenna-specific weights for the plurality of antennas are applied to each of the combined data sequences and the antenna specific weights are applied to pilot bits added with the combined data sequences;

wherein the received signal includes the pilot bits for each of the plurality of antennas; and

wherein the pilot bits for each antenna have a different sequence for that antenna;

the circuitry is further configured to derive preferred weights for the received signal based on the pilot bits for each antenna;

the circuitry is further configured to recover data for the single user from each of the different sequences; and

the circuitry is further configured to combine data from the recovered data for the single user from each of the different sequences.

2. A method for use by a receiving device, the method comprising:

receiving, by the receiving device, a signal including pilot bits transmitted by a plurality of antennas;

wherein the received signal includes data for a single user that was combined with different sequences producing a plurality of combined data sequences;

wherein antenna-specific weights for the plurality of antennas are applied to each of the combined data sequences and the antenna specific weights are applied to pilot bits added with the combined data sequences;

wherein the received signal includes the pilot bits for each of the plurality of antennas; and

wherein the pilot bits for each antenna have a different sequence for that antenna;

deriving, by the receiving device, preferred weights for the received signal based on the pilot bits for each antenna;

recovering, by the receiving device, data for the single user from each of the combined data sequences; and

combining, by the receiving device, data from the recovered data for the single user from each of the different sequences.

3. A transmitting device comprising:

circuitry is configured to generate data for a single user for transmission to a receiving device;

the circuitry is further configured to combine the data for the single user with different sequences to produce a plurality of combined data sequences;

wherein antenna-specific weights for the plurality of antennas are applied to each of the combined data sequences and the antenna specific weights are applied to pilot bits added with the combined data sequences;

the circuitry is further configured to produce pilot bits for each antenna of the plurality of antennas;

wherein the pilot bits for each antenna have a different sequence for that antenna to permit the receiving device to derive weights for that antenna; and

the plurality of antennas configured to transmit the combined data sequences and the produced pilot bits using the plurality of antennas to the receiving device.