Frequency-division multiplexing transceiver apparatus, wave-number-division multiplexing transceiver apparatus and method thereof

• US 7,873,096 B2
• Filed: 11/11/2009
• Issued: 01/18/2011
• Est. Priority Date: 03/15/2006
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Kawasaki, Toshio
• Primary Examiner(s): Odom; Curtis B
• Application Number:
  US12/616,238
• Publication Number:
  US 20100103984A1
• Time in Patent Office: 433 Days
• Field of Search: 375/135, 375/146, 370203-211
• US Class Current: 375/146
• CPC Class Codes: H04B 1/707 using direct sequence modulation
• CPC Class Codes: H04J 13/0048 Walsh
• CPC Class Codes: H04L 27/2607 Cyclic extensions
• CPC Class Codes: H04L 27/2626 Arrangements specific to the transmitter only
• CPC Class Codes: H04L 5/0003 Two-dimensional division time-code division H04J11/00, H04J13/00; for time-space division H04B7/0413, H04B7/0697
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0037 Inter-user or inter-terminal allocation
• CPC Class Codes: H04L 5/0044 allocation of payload

Abstract

A frequency-division multiplexing transmission apparatus for transmitting data in a frequency spectrum specific to both symbol and mobile station, is disclosed. The apparatus encodes transmission data, modulates the encoded data, compresses the time domains of each symbol of the modulated transmission-symbol sequence, repeats the symbols a specified number of times, rearranges each of the symbols of the obtained repetitive-symbol sequence so that they have the same arrangement as the transmission-symbol sequence, generates each phase that changes at a speed specific to each symbol of the transmission-symbol sequence, performs phase rotation specific to the symbols for each symbol of the rearranged repetitive-symbol sequence, generates phase that changes at a speed specific to a mobile station, performs phase rotation specific to the mobile station for the symbol sequence for which the phase rotation was performed, and transmits the phase-rotated symbol sequence.

Claims

1. A wave-number-division multiplexing transmission apparatus that transmits data in a wave-number spectrum specific to both symbol and mobile station, and comprising:

an encoder for encoding transmission data;

a data-modulation unit for modulating output data from said encoder;

a time-domain compression and repetition unit for compressing the time domains of each symbol of the transmission-symbol sequence that is output from said modulation unit, and repeating the symbols a specified number of times;

a symbol-rearrangement unit for rearranging each of the symbols of the obtained repetitive-symbol sequence so that they have the same arrangement as said transmission-symbol sequence;

a spreading-code-generation unit for generating a specified wave number code that makes up a Walsh code as a spreading code for each symbol of said repetitive-symbol sequence;

a spreading unit for multiplying each symbol of said repetitive-symbol sequence with said spreading code to spread the symbols; and

a transmission unit for transmitting the output from said spreading unit.

2. The wave-number-division multiplexing transmission apparatus of claim 1 wherein;

said spreading-code-generation unit generates a different wave-number code that makes up a Walsh code for each mobile station as said spreading code.

3. A wave-number-division multiplexing receiving apparatus of claim 1, comprising:

a receiving unit for receiving signals transmitted from said transmission apparatus;

an orthogonal-demodulation unit for demodulating each of the symbols of said repetitive-symbol sequence from the received signal;

a timing-detection unit for detecting frame-symbol timing of the received symbol sequence;

a Walsh WFT processing unit for selecting the received symbol sequence at the timing detected by the timing-detection unit, and performing Walsh WFT conversion of the received symbol sequence to convert it to a wave number spectrum;

a combiner for combining the wave-number spectra specific to the symbol of the transmission-symbol sequence and the mobile station for each mobile station and symbol; and

a decoder for decoding the data from the combined signals of each symbol.

4. A wave-number-division multiplexing transmission method for transmitting data in a wave-number spectrum specific to both symbol and mobile station, and comprising:

a first step of encoding transmission data, and modulating the encoded data;

a second step of compressing the time domains of each symbol of the modulated transmission-symbol sequence, and repeating the symbols a specified number of times;

a third step of rearranging each of the symbols of the obtained repetitive-symbol sequence so that they have the same arrangement as said transmission-symbol sequence;

a fourth step of generating a specified wave number code that makes up a Walsh code as a spreading code for each symbol of said repetitive-symbol sequence, and multiplying each symbol of said repetitive-symbol sequence with said spreading code to spread the symbols; and

a fifth step of transmitting said spread output.

5. The wave-number-division multiplexing transmission method of claim 4, wherein;

a different wave-number code that makes up a Walsh code for each mobile station as said spreading code is generated.

6. A wave-number-division multiplexing receiving method of claim 4, comprising:

a sixth step of receiving signals transmitted from said transmission apparatus, and demodulating each of the symbols of said repetitive-symbol sequence from the received signal;

a seventh step of detecting frame-symbol timing of the received symbol sequence, selecting the received symbol sequence at the detected timing, and performing Walsh WFT conversion of the received symbol sequence to convert it to a wave-number spectrum;

an eighth step of combining the wave-number spectra specific to the symbol of the transmission-symbol sequence and the mobile station for each mobile station and symbol; and

a ninth step of decoding the data from the combined signals of each symbol.