Wireless transceiver and wireless transmitting/receiving method and program thereof

• US 8,090,039 B2
• Filed: 02/18/2004
• Issued: 01/03/2012
• Est. Priority Date: 02/18/2003
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Fujii, Masaaki
• Primary Examiner(s): Tran, Khanh C
• Assistant Examiner(s): Hughes, Eboni
• Application Number:
  US10/544,349
• Publication Number:
  US 20060251149A1
• Time in Patent Office: 2,876 Days
• Field of Search: 375/143, 375/146, 375/148, 375/229, 375/267, 375/295, 370/204, 370/210, 370/320, 370/334, 370/335, 370/343, 370/431, 455/562.1
• US Class Current: 375/267
• CPC Class Codes: H04B 1/7097 Interference-related aspects
• CPC Class Codes: H04B 2201/709709 Methods of preventing interference
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04B 7/0678 using different spreading codes between antennas code allocation H04J13/16
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04L 1/0041 Arrangements at the transmitter end
• CPC Class Codes: H04L 1/0056 Systems characterized by the type of code used H04L1/08 takes precedence
• CPC Class Codes: H04L 1/0618 Space-time coding
• CPC Class Codes: H04L 5/026 using code division

Abstract

The present invention is provided with a wireless transceiver and wireless transmitting/receiving method and program thereof capable of improving the robustness against Doppler frequency by containing transmit diversity signals in one spreading region. In the present invention, the transmitter encodes the transmit signals using a space-time matrix and transmits the encoded space-time signals after being spread with different spreading codes, and the receiver de-spreads the received spread signals, in unit of time slot, with the spreading codes corresponding to the respective time slots and then decodes the de-spread signals using the space-time matrix.

Claims

1. A wireless transmitter, comprising:

an encoder to encode transmitting signals using a space-time code matrix and to output space-time code outputs, each of the space-time code outputs including space-time code signals;

spreaders to respectively spread space-time code signals of each of the space-time code outputs by using a plurality of different spreading codes, the space-time code signals being different based on an encoding operation of the encoder, wherein the space-time code signals of each of the space-time code outputs are spread into a same spreading region in time and frequency domains in order that the spread space-time code signals are stacked on the same spreading region;

multiplexers to respectively generate a multiplexed spread space-time code signal by multiplexing the spread space-time code signals of the same spreading region; and

a transmitter to simultaneously transmit multiplexed spread space-time code signals output from the multiplexers through different antennas;

wherein the space-time code signals include a first space-time code signal and a second space-time code signal, the first and second space-time code signals correspond to first and second time slots, respectively, and each of the spreaders spreads the first and second space-time code signals into the same spreading region using the spreading codes at the first and second time slots.

2. The wireless transmitter as set forth in claim 1, wherein each of the spreaders spreads the space-time code signals of the time slots at which the space-time encoding outputs are different, in a time domain using the different spreading codes.

3. The wireless transmitter as set forth in claim 1, wherein each of the spreaders spreads the space-time code signals of the time slots at which the space-time encoding outputs are different, in time and frequency domains using the different spreading codes.

4. A wireless receiver, comprising:

a receiver to receive simultaneously multiplexed spread space-time code signals that have been spread into different spreading regions, wherein each of the multiplexed spread space-time code signals is generated by multiplexing spread space-time signals of a same spreading region, the spread space-time code signals are spread using different spreading codes and are spread into the same spreading region in order that the spread space-time code signals are stacked on the same spreading region;

a de-spreader to de-spread the spread space-time code signals received by the receiver at predetermined time slots using the spreading codes corresponding thereto; and

a decoder to decode the de-spread space-time code signals from the de-spreader using the space-time code matrix;

wherein the space-time code signals include a first space-time code signal and a second space-time code signal, the first and second space-time code signals correspond to first and second time slots, respectively, and the de-spreader de-spreads the first and second space-time code signals of the same spreading region using one of the spreading codes at the first and second time slots.

5. A wireless receiver, comprising:

receiving means for simultaneously receiving multiplexed spread space-time code signals that have been spread into different spreading regions in a time domain, wherein each of the multiplexed spread space-time code signals is generated by multiplexing spread space-time code signals of a same spreading region, the spread space-time code signals are spread using different spreading codes and are spread into the same spreading region in order that the spread space-time code signals are stacked on the same spreading region;

de-spreading means for de-spreading the spread space-time code signals received by the receiving means at predetermined time slots in the time domain using the spreading codes corresponding thereto; and

decoding means for decoding the de-spread space-time code signals from the de-spreading means using the space-time code matrix;

wherein the space-time code signals include a first space-time code signal and a second space-time code signal, the first and second space-time code signals correspond to first and second time slots, respectively, and each of the de-spreading means de-spreads the first and second space-time code signals of the same spreading region using the spreading codes at the first and second time slots.

6. A wireless receiver, comprising:

receiving means for simultaneously receiving multiplexed spread space-time code signals that have been spread into different spreading regions in time and frequency domains, wherein each of the multiplexed spread space-time code signals is generated by multiplexing spread space-time code signals of a same spreading region, the spread space-time code signals are spread using different spreading codes and are spread into the same spreading region in order that the spread space-time code signals are stacked on the same spreading region;

de-spreading means for de-spreading the spread space-time code signals received by the receiving means at predetermined time slots in the time domain using the spreading codes corresponding thereto;

decoding means for decoding the de-spread space-time code signals from the de-spreading means using the space-time code matrix; and

combining means for combining the decoded signals from the decoding means in the frequency domain;

wherein the space-time code signals include a first space-time code signal and a second space-time code signal, the first and second space-time code signals correspond to first and second time slots, respectively, and the first and second space-time code signals of the same spreading region are de-spread using the spreading codes at the first and second time slots.

7. A transmitting method, comprising:

encoding transmission signals using a space-time code matrix and outputting space-time code outputs, each of the space-time code outputs including space-time code signals;

spreading space time code signals of each of the space-time code outputs by using a plurality of different spreading codes, the space-time code signals being different based on an encoding operation of the encoder, wherein the space-time code signals of each of the space-time code outputs are spread into a same spreading region in time and frequency domains in order that the spread space-time code signals are stacked on the same spreading region;

multiplexing the spread space-time code signals of the same spreading region to generate multiplexed spread space-time code signals corresponding to the space-time code outputs; and

simultaneously transmitting the multiplexed spread space-time code signals through different antennas;

wherein the space-time code signals include a first space-time code signal and a second space-time code signal, the first and second space-time code signals correspond to first and second time slots, respectively, and the first and second space-time code signals are spread into the same spreading region using the spreading codes at the first and second time slots.

8. A receiving method, comprising:

simultaneously receiving multiplexed spread space-time code signals that have been spread into spreading regions, wherein each of the multiplexed spread space-time code signals is generated by multiplexing spread space-time code signals of a same spreading region, the spread space-time code signals are spread using different spreading codes and are spread into the same spreading region in order that the spread space-time code signals are stacked on the same spreading region;

de-spreading the received spread space-time code signals at predetermined time slots using the spreading codes corresponding thereto; and

decoding the de-spread space-time code signals using the space-time code matrix;

wherein the space-time code signals include a first space-time code signal and a second space-time code signal, the first and second space-time code signals correspond to first and second time slots, respectively, and the first and second space-time code signals of the same region are de-spread using the spreading codes at the first and second time slots.

9. A non-transitory computer readable medium encoding a transmitter program, when executed by a computer, to perform processes comprising:

encoding transmission signals using a space-time code matrix and outputting space-time code outputs, each of the space-time code outputs including space-time code signals;

spreading space-time code signals of each of the space-time code outputs by using a plurality of different spreading codes, the space-time code signals being different based on an encoding operation of the encoder, wherein the space-time code signals of each of the space-time code outputs are spread into a same spreading region in time and frequency domains in order that the spread space-time code signals are stacked on the same spreading region;

multiplexing the spread space-time code signals of the same spreading region to generate multiplexed spread space-time code signals corresponding to the space-time code outputs; and

simultaneously transmitting the multiplexed spread space-time code signals through different antennas;

wherein the space-time code signals include a first space-time code signal and a second space-time code signal, the first and second space-time code signals correspond to first and second time slots, respectively, and the first and second space-time code signals are spread into the same spreading region using the spreading codes at the first and second time slots.

10. A non-transitory computer readable medium encoding a receiver program, when executed by a computer, to perform processes comprising:

simultaneously receiving multiplexed spread space-time code signals that have been spread into different spreading regions, wherein each of the multiplexed spread space-time code signals is generated by multiplexing spread space-time code signals of a same spreading region, the spread space-time code signals are spread using different spreading codes and are spread into the same spreading region in order that the spread space-time code signals are stacked on the same spreading region;

de-spreading the received spread space-time code signals at predetermined time slots using the spreading codes corresponding thereto; and

decoding the de-spread space-time code signals using the space-time code matrix; and

wherein the space-time code signals include a first space-time code signal and a second space-time code signal, the first and second space-time code signals correspond to first and second time slots, respectively, and the first and second space-time code signals of the same region are de-spread using the spreading codes at the first and second time slots.