Signal generation method and signal generation device

• US 9,236,923 B2
• Filed: 02/09/2015
• Issued: 01/12/2016
• Est. Priority Date: 12/10/2010
• Status: Active Grant

• Current Assignee: Sun Patent Trust
• Original Assignee: Panasonic Intellectual Property Corporation of America (Panasonic Holdings Corporation)
• Inventors: Murakami, Yutaka, Kimura, Tomohiro, Ouchi, Mikihiro
• Primary Examiner(s): Huynh, Dung B
• Application Number:
  US14/617,292
• Publication Number:
  US 20150155925A1
• Time in Patent Office: 337 Days
• Field of Search: None
• US Class Current: 1/1
• CPC Class Codes: G06F 11/10 Adding special bits or symbols to the coded information, e.g. parity check, casting out 9's or 11's
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/0456 Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
• CPC Class Codes: H04B 7/0482 Adaptive codebooks
• CPC Class Codes: H04B 7/0669 using different channel coding between antennas space-time coding H04L1/0618
• CPC Class Codes: H04B 7/0682 using phase diversity (e.g. phase sweeping)
• CPC Class Codes: H04B 7/0697 using spatial multiplexing
• CPC Class Codes: H04L 1/0058 Block-coded modulation
• CPC Class Codes: H04L 25/0224 using sounding signals
• CPC Class Codes: H04L 25/03898 codebook-based design selection of codebook or precoding matrix for MIMO diversity systems H04B7/0456
• CPC Class Codes: H04L 25/067 providing soft decisions, i.e. decisions together with an estimate of reliability H04L25/068 and H04L25/069 take precedence; sequence estimation techniques H04L25/03178
• CPC Class Codes: H04L 27/2627 Modulators
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04W 72/044 based on the type of the allocated resource

Abstract

A transmission method simultaneously transmitting a first modulated signal and a second modulated signal at a common frequency performs precoding on both signals using a fixed precoding matrix and regularly changes the phase of at least one of the signals, thereby improving received data signal quality for a reception device.

Claims

1. A transmission method comprising:

generating coded blocks made up of a plurality of bits by using a predetermined error correction block coding scheme;

generating, for each of a plurality of slots, a first transmission signal z1 and a second transmission signal z2 from the coded blocks; and

transmitting the first transmission signal z1 from a first antenna of a first base station at a first period at a first frequency, and the second transmission signal z2 from a second antenna of a second base station at the first period at the first frequency,

the transmission signal generation including;

generating, for each of the plurality of slots, a first modulated signal s1 and a second modulated signal s2 from each of the coded blocks;

with respect to the first modulated signal s1 and the second modulated signal s2, applying precoding expressed by a fixed matrix F, and

the matrix F being expressed as;

2. A transmission apparatus comprising:

an encoder that generates coded blocks made up of a plurality of bits by using a predetermined error correction block coding scheme;

a transmission signal generator that generates, for each of a plurality of slots, a first transmission signal z1 and a second transmission signal z2 from the coded blocks;

a first transmitter that transmits the first transmission signal z1 from a first antenna of a first base station at a first period at a first frequency; and

a second transmitter that transmits the second transmission signal z2 from a second antenna of a second base station at the first period at the first frequency,

the transmission signal generator including;

a modulated signal generator that generates, for each of the plurality of slots, a first modulated signal s1 and a second modulated signal s2 from each of the coded blocks;

a pre-coder that applies precoding expressed by a fixed matrix F with respect to the first modulated signal s1 and the second modulated signal s2; and

the matrix F being expressed as;

3. A reception method comprising:

acquiring a reception signal obtained by receiving a first transmission signal z1 transmitted from a first antenna of a first base station at a first period at a first frequency and a second transmission signal z2 transmitted from a second antenna of a second base station at the first period at the first frequency, the first transmission signal z1 and the second transmission signal z2 having been generated by a predetermined generation process; and

obtaining reception data by applying a demodulation process corresponding to the predetermined generation process to the reception signal,

the predetermined generation process

being a process to generate, for each of a plurality of slots, the first transmission signal z1 and the second transmission signal z2 from each of coded blocks having been generated by using a predetermined error correction block coding scheme and made up of a plurality of bits, and

including;

generating, for each of the plurality of slots, a first modulated signal s1 and a second modulated signal s2 from each of the coded blocks;

with respect to the first modulated signal s1 and the second modulated signal s2, applying precoding expressed by a fixed matrix F,

the matrix F being expressed as;

4. A reception apparatus comprising:

an acquirer that acquires a reception signal obtained by receiving a first transmission signal z1 transmitted from a first antenna of a first base station at a first period at a first frequency and a second transmission signal z2 transmitted from a second antenna of a second base station at the first period at the first frequency, the first transmission signal z1 and the second transmission signal z2 having been generated by a predetermined generation process; and

a demodulator that obtains reception data by applying a demodulation process corresponding to the predetermined generation process to the reception signal,

the predetermined generation process

being a process to generate, for each of a plurality of slots, the first transmission signal z1 and the second transmission signal z2 from each of coded blocks having been generated by using a predetermined error correction block coding scheme and made up of a plurality of bits, and

including;

generating, for each of the plurality of slots, a first modulated signal s1 and a second modulated signal s2 from each of the coded blocks;

with respect to the first modulated signal s1 and the second modulated signal s2, applying precoding expressed by a fixed matrix F,

the matrix F being expressed as;