Multiplexing of real time services and non-real time services for OFDM systems

• US 7,664,193 B2
• Filed: 12/07/2005
• Issued: 02/16/2010
• Est. Priority Date: 03/22/2000
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Jalali, Ahmad, Wallace, Mark, Walton, Jay R.
• Primary Examiner(s): TSE, YOUNG TOI
• Application Number:
  US11/297,244
• Publication Number:
  US 20060088007A1
• Time in Patent Office: 1,532 Days
• Field of Search: 375/260, 375/261, 375/262, 375/265, 375/267, 375/299, 375/347, 455/65, 455/66.1, 455/132, 455/272
• US Class Current: 375/267
• CPC Class Codes: H04L 27/26 Systems using multi-frequency codes H04L27/32 takes precedence
• CPC Class Codes: H04L 5/023 Multiplexing of multicarrier modulation signals multicarrier modulation H04L27/2601

Abstract

For certain embodiments of the present disclosure, a method and apparatus for generating pilots in a wireless multiple-input multiple output (MIMO) communication system is provided. The method comprises obtaining at least one pilot symbol for each antenna of a plurality of antennas, obtaining an orthogonal sequence for each antenna in the plurality of antennas, and covering the at least one pilot symbol for each antenna with the orthogonal sequence to obtain a sequence of covered pilot symbols for each antenna to obtain at least one covered pilot symbols for each of the plurality of antennas.

Claims

1. A method for providing channel information in a wireless communication system, comprising:

processing a first set of signals received at a plurality of receiver antennas;

determining channel state information (CSI) indicative of channel conditions for the plurality of receiver antennas, the CSI comprising information indicative of an eigenvector matrix;

transmitting the CSI to a transmitter of the first set of signals received at the plurality of receiver antennas; and

performing a channel matched filter operation on a second set of signals received from the transmitter utilizing the eigenvector matrix.

2. A wireless device comprising:

a plurality of antennas; and

a processor coupled to the plurality of antennas, wherein the processor is configured to;

determine channel state information (CSI) indicative of channel conditions for a first set of signals received at the plurality of antennas, the CSI comprising information indicative of an eigenvector matrix;

transmit the CSI to a transmitter of the first set of signals received at the plurality of antenna; and

perform a channel matched filter operation on a second set of signals received from the transmitter utilizing the eigenvector matrix.

3. An apparatus for wireless communication, comprising:

means for processing a first set of signals received at a plurality of receiver antennas;

means for determining channel state information (CSI) indicative of channel conditions for the plurality of receiver antennas, the CSI comprising information indicative of an eigenvector matrix;

means for transmitting the CSI to a transmitter of the first set of signals received at the plurality of receiver antennas; and

means for performing a channel matched filter operation on a second set of signals received from the transmitter utilizing the eigenvector matrix.

4. An apparatus for wireless communication, comprising;

a plurality of transmit antennas; and

a processor operative to

transmit signals to a plurality of receive antennas at a receiver,

receive channel state information (CSI) from the receiver,

determine an eigenvector matrix from the CSI, and

precondition modulation symbols for transmission to the receiver from the plurality of transmit antennas utilizing the eigenvector matrix.