Apparatus and Method for Transmitting and Receiving Packet Data Using Multiple Antennas in a Wireless Communication System

• US 20080192683A1
• Filed: 06/23/2005
• Published: 08/14/2008
• Est. Priority Date: 06/23/2004
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Kim, Dong-Hee, Kwon, Hwan-Joon, Kim, Dae-Gyun, Mun, Cheol, Han, Jin-Kyu, Kim, Youn-Sun, Chang, Jin-Weon
• Granted Patent: US 8,233,426 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04B 7/0417 Feedback systems
• CPC Class Codes: H04B 7/0452 Multi-user MIMO systems
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/0634 Antenna weights or vector/matrix coefficients
• CPC Class Codes: H04L 1/0003 by switching between different modulation schemes
• CPC Class Codes: H04L 1/0009 by adapting the channel coding H04L1/1812 takes precedence
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 25/0204 of multiple channels
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/006 Quality of the received signal, e.g. BER, SNR, water filling
• CPC Class Codes: H04L 5/0064 Rate requirement of the data, e.g. scalable bandwidth, data priority
• CPC Class Codes: H04W 52/262 taking into account adaptive modulation and coding [AMC] scheme AMC per se H04L1/0001

Abstract

An apparatus and method for transmitting and receiving packet data using multiple antennas in a wireless communication system is provided. In a wireless communication, system using multiple antennas, the apparatus and method can efficiently transmit and receive packet data according to channel conditions without a waste of transmission bandwidth.

Claims

1. An apparatus for transmitting packet data in a wireless communication system that receives channel status information between multiple transmission antennas and multiple reception antennas as feedback information, comprising:

a feedback signal receiver for receiving the feedback information being fed back from each of receivers;

a user classifier for classifying users having transmission data streams into groups using preferred basis transform information output from the feedback signal receiver;

a scheduling and demultiplexing block for receiving an output of the user classifier and the feedback information from the feedback signal receiver, selecting at least one of a group with a transmission priority and user data to be transmitted in the corresponding group according to the received information, and outputting the selected substream, adaptive modulation and coding (AMC) information for the selected substream, and power allocation information;

an AMC block for modulating and coding a substream output from the scheduling and demultiplexing block according to the AMC information;

a power allocator for allocating transmission power to the AMC-processed substream according to the power allocation information; and

a transmitter for transmitting the power-allocated substream through each of the transmission antennas.

2. The apparatus of claim 1, wherein the scheduling and demultiplexing block further outputs basis transform weight information for the selected substream;

the apparatus further comprises a basis transformer for applying the basis transform weight information to the power-allocated signal and transmitting substreams.

3. The apparatus of claim 2, further comprising:

a transmission antenna pilot signal generator for generating a pilot signal to be transmitted through each of the multiple transmission antennas; and

adders allocated to their associated antennas, for adding the per-transmission antenna pilot signal to the signal output from the basis transformer.

4. A reception apparatus for generating feedback information for channels between multiple transmission antennas and multiple reception antennas in a wireless communication system including the multiple transmission antennas, the system transmitting packet data through the multiple transmission antennas, each transmission antenna transmitting packet data without forming of a pilot signal, and receiving the packet data using the multiple reception antennas, the apparatus comprising:

pilot signal estimators, provided to each of the multiple reception antennas, for estimating pilot signals received from the multiple transmission antennas;

a channel matrix estimator for generating a channel estimation matrix from per-antenna channel-estimated information using signals received from the pilot signal estimators;

a basis transform equivalent channel generator for generating a basis transform equivalent channel matrix for packet data transmitted from a transmitter using the generated channel estimation matrix; and

a feedback signal decider for selecting an optimal basis transform equivalent channel from the basis transform equivalent channel generator, and generating feedback information for the selected basis transform equivalent channel.

5. The reception apparatus of claim 4, wherein the basis transform equivalent channel generator estimates an equivalent channel for all of basis transform matrixes in a basis transform matrix set.

6. The reception apparatus of claim 5, wherein if a matrix calculated from the channel matrix estimator is represented by {tilde over (H)} and a basis transform matrix E^(g) is used, the basis transform equivalent channel matrix {tilde over (H)}_g is calculated as {tilde over (H)}_g={tilde over (H)}E^(g).

7. A method for transmitting packet data in a wireless communication system that receives channel status information between multiple transmission antennas and multiple reception antennas as feedback information, comprising the steps of:

receiving a basis transform matrix and channel quality information (CQI) corresponding thereto, from all of terminals, and classifying users preferring the same basis into groups based on the feedback information;

selecting at least one of users desiring to transmit packet data taking into account a priority of the classified group and a priority of a user;

classifying the selected user data into substreams, and performing adaptive modulation and coding (AMC) on each of the substreams;

allocating power to the AMC-processed substreams; and

performing basis transform on each of the power-allocated substreams before transmission.

8. A reception method for generating feedback information for channels between multiple transmission antennas and multiple reception antennas in a wireless communication system including the multiple transmission antennas, the system transmitting packet data through the multiple transmission antennas, each transmission antenna transmitting packet data without forming of a pilot signal, and receiving the packet data using the multiple reception antennas, the method comprising the steps of:

estimating each of pilot signals received from the multiple transmission antennas in each of the multiple reception antennas;

generating a channel estimation matrix from a transmitter to the multiple reception antennas using pilot signals estimated for the multiple reception antennas;

generating basis transform equivalent channel matrix for packet data transmitted from the transmitter using the generated channel estimation matrix; and

selecting an optimal basis transform equivalent channel from the basis transform equivalent channel generator and generating feedback information for the selected basis transform equivalent channel.

9. The reception method of claim 8, wherein the step of generating a basis transform equivalent channel comprises the step of estimating an equivalent channel for all of basis transform matrixes in a basis transform matrix set.

10. The reception method of claim 9, wherein if the channel estimated matrix is represented by {tilde over (H)} and a basis transform matrix E^(g) is used, the basis transform equivalent channel matrix {tilde over (H)}_g is calculated as {tilde over (H)}_g={tilde over (H)}E^(g).