Signal processing apparatus and method in multi-input/multi-output communications systems

• US 20050220211A1
• Filed: 03/31/2005
• Published: 10/06/2005
• Est. Priority Date: 04/02/2004
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Shim, Dong-Hee, Kim, Bong-Hoe, Seo, Dong-Yeon
• Granted Patent: US 7,848,442 B2
• Time in Patent Office: Days
• US Class Current: 375/267
• 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 1/0025 Transmission of mode-switching indication
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0071 Use of interleaving interleaving per se H03M13/27
• CPC Class Codes: H04L 1/06 using space diversity

Abstract

A signal processing apparatus in a multi-input/multi-output (MIMO) communication system includes a transmitting end in which a code rate is differently set and a respectively different modulation method is performed at each antenna in consideration of a channel situation of each transmission antenna, coded bits are separately interleaved, and then collectively interleaved to transmit data, and a receiving end in which received data is collectively deinterleaved and then decoded and deinterleaved separately according to each reception antenna, and a channel situation of each signal received from multiple transmission antennas is estimated and fed back to the transmitting end. A different coding rates and modulation method are used at each transmission antenna and the spatial interleaving is performed to obtain a diversity gain in a space domain, and thus, the communication quality can be enhanced.

Claims

1. A signal receiver in an MIMO communication system, wherein data separately received through each reception antenna is decoded and deinterleaved differently according to each reception antenna, and then again deinterleaved collectively (spatially).

2. The signal receiver of claim 1 includes a unit for estimating a channel situation transmitted from a plurality of transmission antennas and feeding it back to a transmitting end.

3. The signal receiver of claim 1, wherein the received data has been undergone an interleaving step separately performed by each transmission antenna and an interleaving step collectively performed on the entire multiple transmission antennas.

4. The signal receiver of claim I further includes a unit for estimating a channel through a pilot signal received separately from each transmission antenna.

5. A signal transmission method in a multi-input/multi-output (MIMO) communication system, comprising:

coding and interleaving each demultiplexed data;

collectively (spatially) interleaving the coded and interleaved multiple data again; and

modulating each data, spreading and scrambling the modulated data, and then transmitting it through multiple transmission antennas.

6. The method of claim 5, wherein the data is coded at a different rate and modulated differently for each transmission antenna in consideration of a channel situation of each transmission antenna.

7. A signal reception method in a multi-input/multi-output (MIMO) communication system, comprising:

receiving data through multiple reception antennas, dispreading and descrambling it, and then, demodulating and estimating the despread and descrambled data;

collectively (spatially) deinterleaving the data; and

separately decoding and deinterleaving the data.

8. The method of claim 7, further comprising:

transmitting one index of a table, which includes each size of signal blocks transmittable at each transmission antenna, modulation methods and coding rates which has been determined and agreed with a transmitting end, as a feedback signal by using an SINR (Signal to Interference Noise Ratio) of the data estimated at each reception antenna.

9. A signal processing method in a multi-input/multi-output (MIMO) communication system, comprising:

interleaving coded bits to be transmitted through each transmission antenna;

interleaving the coded bits entirely again;

modulating the coded bits, spreading and scrambling the modulated data, and then transmitting the data through multiple transmission antennas;

receiving the data through multiple reception antennas, dispreading and descrambling the data, and the demodulating and estimating it;

collectively (spatially) deinterleaving the data received through each reception antenna; and

decoding and deinterleaving the data for each reception antenna.