Signal generation method and signal generation device

• US 8,989,137 B2
• Filed: 09/16/2014
• Issued: 03/24/2015
• 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): Moore, Ian N
• Assistant Examiner(s): Huynh, Dung B
• Application Number:
  US14/487,696
• Publication Number:
  US 20150003555A1
• Time in Patent Office: 189 Days
• Field of Search: None
• US Class Current: 370/330
• 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 a coded block 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 block; and

transmitting the first transmission signal z1 and the second transmission signal z2 respectively from a first antenna and a second antenna at the same time at the same 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 the coded block;

with respect to the first modulated signal s1 and the second modulated signal s2, applying precoding expressed by a fixed matrix F and performing a phase change while regularly varying a scheme of phase change for each of the plurality of slots,

the matrix F being expressed as;

2. A transmission apparatus comprising:

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

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

a transmitting unit transmitting the first transmission signal z1 and the second transmission signal z2 respectively from a first antenna and a second antenna at the same time at the same frequency,

the transmission signal generating unit including;

a modulated signal generating unit generating a first modulated signal s1 and a second modulated signal s2 from the coded block;

a precoding unit applying precoding expressed by a fixed matrix F; and

a phase changing unit performing a phase change while regularly varying a scheme of phase change for each of the plurality of slots,

the precoding and the phase change being performed with respect to the first modulated signal s1 and the second modulated signal s2,

the matrix F being expressed as;

3. A reception method comprising:

acquiring a reception signal obtained by receiving a first transmission signal z1 and a second transmission signal z2 respectively transmitted from a first antenna and a second antenna at the same time at the same 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 a coded block 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 the coded block;

with respect to the first modulated signal s1 and the second modulated signal s2, applying precoding expressed by a fixed matrix F and performing a phase change while regularly varying a scheme of phase change for each of the plurality of slots,

the matrix F being expressed as;

4. A reception apparatus comprising:

an acquiring unit acquiring a reception signal obtained by receiving a first transmission signal z1 and a second transmission signal z2 respectively transmitted from a first antenna and a second antenna at the same time at the same frequency, the first transmission signal z1 and the second transmission signal z2 having been generated by a predetermined generation process; and

a demodulating unit 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 a coded block 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 the coded block;

with respect to the first modulated signal s1 and the second modulated signal s2, applying precoding expressed by a fixed matrix F and performing a phase change while regularly varying a scheme of phase change for each of the plurality of slots,

the matrix F being expressed as;