Transmission device, transmission method, reception device, reception method, and program

• US 10,554,318 B2
• Filed: 08/26/2016
• Issued: 02/04/2020
• Est. Priority Date: 09/10/2015
• Status: Active Grant

• Current Assignee: Sony Semiconductor Solutions Corporation (Sony Group Corp.)
• Original Assignee: Sony Semiconductor Solutions Corporation (Sony Group Corp.)
• Inventors: Shinagawa, Masashi, Noda, Makoto
• Primary Examiner(s): Smarth, Gerald A
• Application Number:
  US15/753,981
• Publication Number:
  US 20180241490A1
• Time in Patent Office: 1,257 Days
• CPC Class Codes: H04J 3/06 Synchronising arrangements for television systems H04N5/04; bit-synchronisation H04L7/00
• CPC Class Codes: H04L 25/0202 Channel estimation
• CPC Class Codes: H04L 25/0226 sounding signals per se
• CPC Class Codes: H04L 27/18 Phase-modulated carrier systems, i.e. using phase-shift keying H04L27/32 takes precedence
• CPC Class Codes: H04L 7/0058 detection of error based on equalizer tap values
• CPC Class Codes: H04L 7/042 Detectors therefor, e.g. correlators, state machines digital correlators in general G06F17/15

Abstract

A present technology relates to a transmission device, a transmission method, a reception device, a reception method, and a program that can improve reception performance of a frame to which a preamble is added. A transmission device of one aspect of the present technology generates a preamble including a sequence [d d . . . d −d] having iteration of a sequence d that is one of sequences a and b that are Golay complementary sequences, followed by an inverted sequence of the sequence d, and including a signal sequence in which a maximum value of an absolute value of a side lobe level of cross correlation between a sequence [d d −d] and a sequence [d −d] is 25 or less. The generated preamble is added to data to be transmitted in units of frames. The present technology can be applied to a device that transmits and receives data via a wireless transmission path.

Claims

1. A computer program product embodied on a non-transitory computer-readable data storage device in a manner that the computer program product is executable by a transmission device, the computer program product comprising:

computer code for electronically generating, by a generation unit, a preamble including a sequence [a a . . . a −

a] having iteration of a sequence d that is one of sequences a and b that are Golay complementary sequences, followed by an inverted sequence of the sequence d, and including a signal sequence in which a maximum value of an absolute value of a side lobe level of cross correlation between a sequence [a a −

a] and a sequence [a −

a] is 25 or less; and

computer code for electronically transmitting, by a transmission unit, data to be transmitted in units of frames to which the preamble is added.

2. The computer program product according to claim 1, wherein

the generation unit generates the preamble including the sequence d in which the maximum value of an absolute value of a side lobe level becomes minimum.

3. The computer program product according to claim 1, wherein

the generation unit generates the preamble including the sequence d in which a code-word digital sum (CDS) is 0 and the CDS after π

/2-shift BPSK modulation is 0.

4. The computer program product according to claim 1, wherein

a bit length of the sequence d is 128.

5. The computer program product according to claim 1, wherein

the sequence d is a sequence obtained by applying [−

1, −

1, −

1, +1, +1, −

1, −

1] as a weight vector and [8, 4, 16, 2, 32, 1, 64] as a delay vector to a generation expression.

6. A computer program product embodied on a non-transitory computer-readable data storage device in a manner that the computer program product is executable by a transmission device, the computer program product comprising:

computer code for electronically generating, by a generation unit, a preamble including a combination of sequences a and b that are Golay complementary sequences and sequences −

a and −

b that are inverted sequences of the sequences a and b, and

including, in a channel estimation sequence, a signal sequence of any of

a first basic sequence [a b a −

b a b −

a b],

a second basic sequence [a b −

a b a b a −

b],

a third basic sequence [a −

b a b a −

b −

a −

b],

a fourth basic sequence [a −

b −

a −

b a −

b a b],

inverted sequences of the first to fourth basic sequences,

reverse sequences of the first to fourth basic sequences, and

reverse sequences of the inverted sequences of the first to fourth basic sequences; and

computer code for electronically transmitting, by a transmission unit, data to be transmitted in units of frames to which the preamble is added.

7. The computer program product according to claim 6, wherein

the generation unit generates the preamble including, in the channel estimation sequence, a signal sequence of any of

[−

a b a b a −

b a b −

a b a b] that is a first sequence including the first basic sequence,

[a −

b a b −

a b a b a −

b a b] that is a second sequence including the second basic sequence,

[−

a −

b a −

b a b a −

b −

a −

b a −

b] that is a third sequence including the third basic sequence,

[a b a −

b −

a −

b a −

b a b a −

b] that is a fourth sequence including the fourth basic sequence,

inverted sequences of the first to fourth sequences,

reverse sequences of the first to fourth sequences, and

reverse sequences of the inverted sequences of the first to fourth sequences.

8. The computer program product according to claim 6, wherein

the generation unit generates the preamble including the sequences a and b in which a code-word digital sum (CDS) is 0 and the CDS after π

/2-shift BPSK modulation is 0.

9. The computer program product according to claim 6, wherein

bit lengths of the sequences a and b are 128.

10. A computer program product embodied on a non-transitory computer-readable data storage device in a manner that the computer program product is executable by a reception device, the computer program product comprising:

computer code for electronically receiving by, a reception unit, a transmission signal of data in units of frames to which a preamble is added, the preamble including a sequence [a a . . . a −

a] having iteration of a sequence d that is one of sequences a and b that are Golay complementary sequences, followed by an inverted sequence of the sequence d, and including a signal sequence in which a maximum value of an absolute value of a side lobe level of cross correlation between a sequence [a a −

a] and a sequence [a −

a] is 25 or less;

computer code for electronically applying, by a demodulation unit, demodulation processing to a received signal; and

computer code for electronically obtaining, by a synchronization unit, cross correlation between a received signal sequence obtained by the demodulation processing and the sequence [a −

a], and perform frame synchronization on the basis of threshold detection or maximum value detection of a cross correlation value.

11. A reception device comprising:

computer code for electronically receiving, by a reception unit, a transmission signal of data in units of frames to which a preamble is added, the preamble including a combination of sequences a and b that are Golay complementary sequences and sequences −

a and −

b that are inverted sequences of the sequences a and b, and

including, in a channel estimation sequence, a signal sequence of any of

a first basic sequence [a b a −

b a b −

a b],

a second basic sequence [a b −

a b a b a −

b],

a third basic sequence [a −

b a b a −

b −

a −

b],

a fourth basic sequence [a −

b −

a −

b a −

b a b],

inverted sequences of the first to fourth basic sequences,

reverse sequences of the first to fourth basic sequences, and

reverse sequences of the inverted sequences of the first to fourth basic sequences;

computer code for electronically applying, by a demodulation unit, demodulation processing to a received signal;

computer code for electronically performing, by a synchronization unit frame synchronization on the basis of a received signal sequence obtained by the demodulation processing; and

computer code for electronically obtaining, by an equalization unit first cross correlation between the received signal sequence and first four sequences of the signal sequences included in the channel estimation sequence, obtain second cross correlation between the received signal sequence and last four sequences of the signal sequences, and perform channel estimation on the basis of the first cross correlation and the second cross correlation.