MIMO-MC-CDMA ࠪࠬ࠹ࡓߦ߅ߌࠆ╓ภᄙ㊀ൻߦࠃࠆㆡᔕવㅍ೙ᓮᣇᑼ

(1)

An Adaptive Transmission Control Scheme with Multi-code Multiplexing in MIMO-MC-CDMA System

Hirokazu SADAMATSU^*, Hisato IWAI^* and Hideichi SASAOKA^*

(Received July 13, 2009)

MC-CDMA system and MIMO system have been attracting attention as broadband wireless transmission system. This paper deals with new adaptive transmission control of MC-CDMA in MIMO system. This paper proposes the multi-code multiplexing control to achieve the high quality and high throughput transmission. In the proposed system, the link quality estimation based on pseudo error is employed to estimate the bit error rate (BER) accurately over frequency-selective fading channel. The pseudo error method is effective to estimate the BER which depends on not only the noise but also the inter-code interference. The simulation result shows that the proposed system is useful for high quality and high throughput transmission.

-G[YQTFUMIMO㧘MC-CDMA㧘adaptive transmission control, multi-code Multiplexing㧘pseudo bit error

ࠠ࡯ࡢ࡯࠼MIMOࠪࠬ࠹ࡓ㧘MC-CDMA㧘ㆡᔕવㅍ೙ᓮ㧘╓ภᄙ㊀ൻ㧘ᡆૃࡆ࠶࠻⺋ࠅ

MIMO-MC-CDMA ࠪࠬ࠹ࡓߦ߅ߌࠆ╓ภᄙ㊀ൻߦࠃࠆㆡᔕવㅍ೙ᓮᣇᑼ

ቯ᧻ ብ๺㧘ጤ੗ ⺈ੱ㧘╣ጟ ⑲৻

߹߃߇߈

๟ᵄᢙ᦭ല೑↪߆ߟᄢኈ㊂વㅍࠍน⢻ߣߔࠆᣇ ᑼߣߒߡ MIMO(Multi-Input Multi-Output)ࠪࠬ࠹ࡓ ߇ᵈ⋡ߐࠇߡ޿ࠆ ^1-3)㧚MIMO ࠪࠬ࠹ࡓߪ㧘ㅍฃା

ࠕࡦ࠹࠽ࠍⶄᢙᧄ૶↪ߔࠆߎߣߦࠃࠅ㧘๟ᵄᢙᏪၞ

ࠍᐢߍࠆߎߣߥߊ㜞ㅦㅢାࠍታ⃻ߔࠆߎߣ߇ߢ߈ ࠆ㧚MIMOࠪࠬ࠹ࡓߩ࿕᦭ࡕ࡯࠼વㅍߢߪ㧘ࡈࠚ࡯

ࠫࡦࠣⅣႺߦ઻߁વ៝〝ߩ⁁ᴫߦࠃߞߡ࿕᦭୯ߩ ᄢ߈ߐߦ߫ࠄߟ߈߇↢ߓࠆ㧚ߘߩߚ߼㧘࿕᦭୯߇ዊ ߐ޿ࡄࠬߢߪฃାାภ߇ዊߐߊߥࠅ㧘ㅢାຠ⾰߇ഠ ൻߔࠆ㧚․ߦᦨዊ࿕᦭ࡄࠬߦ߅޿ߡߪഠൻ߇ᄢ߈޿㧚 ߘߩߚ߼㧘ᣢሽᛛⴚߣߒߡࠃߊ૶↪ߐࠇߡ޿ࠆㆡ

ᔕᄌ⺞ᣇᑼ߇ᔅߕߒ߽ല₸⊛ߥવㅍߣߪ⸒޿ಾࠇ ߥ޿㧚ߘߎߢᧄⓂߢߪᦨዊ࿕᦭ࡄࠬߦ߅޿ߡ߽ല₸

⊛ߥવㅍࠍน⢻ߣߔࠆߎߣࠍ⋡⊛ߣߒߡ㧘ߎߩ MIMO ࠪࠬ࠹ࡓߦ MC-CDMA (Multi Carrier-Code Division Multiple Access) ᣇᑼ^4-5)ࠍ⚵ߺวࠊߖߚㅢ

ାᣇᑼࠍኻ⽎ߣߔࠆ㧚MC-CDMA ᣇᑼߪ㧘CDMA ᣇ ᑼ ߣ OFDM (Orthogonal Frequency Division

Multiple) ᣇᑼࠍⲢวߒߚᣇᑼߢ㧘ᖱႎߏߣߦ࿕᦭

ߩ╓ภ♽೉ࠍដߌวࠊߖࠆߎߣߦࠃࠅ࠳ࠗࡃ࡯ࠪ

࠴ലᨐ߇ᓧࠄࠇࠆߣ޿߁․ᓽࠍ᦭ߒߡ߅ࠅ㧘ㄭᐕ㧘

ᰴ਎ઍߩ࠮࡞࡜⒖േㅢାࠪࠬ࠹ࡓߩή✢વㅍᣇᑼ ߣߒߡᵈ⋡ߐࠇߡ޿ࠆ㧚

* Department of Electronics, Doshisha University, Kyotanabe, Kyoto, 610-0321, Japan Telephone: +81-774-65-6355, Fax: +81-774-65-6801, E-mail: hsasaoka@mail.doshisha.ac.jp

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߹ߚ㧘ᓥ᧪ߢߪㆡᔕ⊛ߥવㅍㅦᐲ೙ᓮߣߒߡㆡᔕ ᄌ⺞߇↪޿ࠄࠇࠆ߇㧘MC-CDMAᣇᑼߦ߅޿ߡߪ╓

ภᄙ㊀ᢙࠍㆡᔕ⊛ߦ೙ᓮߔࠆㆡᔕવㅍ೙ᓮ߇ታ⃻

ߢ߈ࠆ㧚ߎߎߢ㧘વ៝〝⁁ᴫߦᔕߓߚㆡᔕવㅍ೙ᓮ ࠍⴕ߁㓙ߦߪ㧘⍍ᤨSNR(Signal to Noise Ratio㧦ㅍା

ାภ㔚ജኻฃାାภ㔚ജᲧ)ߥߤߦࠃࠅવ៝〝ⅣႺ ࠍផቯߒ㧘ߘߩផቯߒߚ୯ߦᔕߓߡㆡᔕવㅍ೙ᓮࠍ ⴕ߁⁶⁾㧚ߒ߆ߒ㧘ߎߩᚻᴺߢߪ㧘๟ᵄᢙㆬᛯᕈࡈࠚ

࡯ࠫࡦࠣⅣႺਅߢߩ MC-CDMA ᣇᑼߩ႐ว㧘᜛ᢔ

╓ภ㑆ߦ⊒↢ߔࠆ⋧੕ᐓᷤߩᓇ㗀ࠍฃߌㅢାຠ⾰

߇ᄢ߈ߊഠൻߔࠆߎߣ߇޽ࠆ㧚ߎߩߚ߼㧘⍍ᤨSNR ߩផቯߦട߃ߡㆃᑧ㊂ࠍᱜ⏕ߦផቯߔࠆᔅⷐ߇޽

ࠆࠅ㧘ߘߩታ⃻ߩߚ߼ⶄ㔀ߥಣℂ߇ᔅⷐߣߥࠆ㧚

৻ᣇ㧘ㅢାຠ⾰ߩഠൻⷐ࿃߇ᄙߊ޽ࠆ႐ว㧘ᡆૃ

ࡆ࠶࠻⺋ࠅࠍ↪޿ߚ࿁✢ຠ⾰ផቯᴺߩ᦭ലᕈ߇⍮

ࠄࠇߡ޿ࠆ^7-11)㧚ߎߩផቯᴺߪ㧘㔀㖸ߩᓇ㗀ߩઁ㧘 ᐓᷤ߿ߘߩઁߩᓇ㗀ࠍోߡ⠨ᘦߒߚ߽ߩߢ㧘ฃାା

ภߦኻߒߡੱὑ⊛ߦାภࠍഠൻߐߖ㧘ߘߩഠൻାภ ߆ࠄ⺋ࠅࠍ⊒↢ߐߖࠆ߽ߩߢ޽ࠆ㧚

ߘߎߢᧄⓂߢߪ㧘╓ภᄙ㊀ൻߦࠃࠆㆡᔕવㅍ೙ᓮ ߦᡆૃࡆ࠶࠻⺋ࠅߦࠃࠆ࿁✢ຠ⾰ផቯࠍ↪޿ࠆᣇ ᴺࠍឭ᩺ߔࠆ㧚ߎࠇߦࠃࠅ㧘ㆃᑧ㊂ࠍᱜ⏕ߦᬌ಴ߔ ࠆߎߣߥߊㅢାຠ⾰ࠍផቯߒ㧘ߘࠇߦࠃࠅㆡಾߥᄙ

㊀ᢙࠍㆬᛯߔࠆߎߣ㧘ㅢାຠ⾰ߩ⛽ᜬ߅ࠃ߮ࠬ࡞࡯

ࡊ࠶࠻ะ਄ߔࠆߎߣ߇ᦼᓙߐࠇࠆ㧚 ឭ᩺ᣇᑼߩ᦭

ലᕈࠍ⏕⹺ߔࠆߚ߼㧘⸘▚ᯏࠪࡒࡘ࡟࡯࡚ࠪࡦߦࠃ ࠅ․ᕈࠍ⹏ଔߒߚ㧚

/+/1/%%&/# ࠪࠬ࠹ࡓ /+/1 ࠪࠬ࠹ࡓ

MIMOࠪࠬ࠹ࡓߣߪ㧘ㅍା஥࡮ฃା஥෺ᣇߦⶄᢙ ߩࠕࡦ࠹࠽ࠍ↪޿ߡ㧘ฦޘߩࠕࡦ࠹࠽߆ࠄ⁛┙ߥା

ภࠍห৻๟ᵄᢙߢવㅍߔࠆࠪࠬ࠹ࡓߢ޽ࠆ㧚ߎࠇߦ ࠃࠅ๟ᵄᢙ೑↪ല₸ࠍ㜞߼ߟߟ㧘ㅍାࠕࡦ࠹࠽ᢙಽ ߦ⋧ᒰߔࠆવㅍ㊂ߩჇടࠍᓧࠆߎߣ߇น⢻ߣߥࠆ㧚

Fig.1 ߦㅍฃାࠕࡦ࠹࠽ᢙࠍߘࠇߙࠇ2ᧄߣߒߚ႐

วߩ MIMO ࠪࠬ࠹ࡓࠍ␜ߔ㧚ߒ߆ߒ㧘ห৻๟ᵄᢙ ߢⶄᢙߩାภࠍㅍାߔࠆߣ㧘Fig.1 ߦ␜ߔࠃ߁ߦฃ

ା஥ߢߪⶄᢙߩାภ߇ᐓᷤߒ޽߁ߚ߼㧘ାภߩಽ㔌 ಣℂ߇ᔅⷐߣߥࠆ㧚ߎߩାภಽ㔌ಣℂߣߒߡએਅߦ

␜ߔ2ㅢࠅߩ႐วߦᄢ೎ߐࠇࠆ㧚

I. વ៝〝ⅣႺߩᖱႎࠍฃା஥ߩߺᣢ⍮ߢ޽ࠆ㧚 II. વ៝〝ⅣႺߩᖱႎࠍㅍା஥࡮ฃା஥෺ᣇߢᣢ⍮

ߢ޽ࠆ㧚

ᧄⓂߢߪ㧘IIߩ႐วߢ޽ࠆવ៝〝ⅣႺߩᖱႎࠍㅍ

ା஥࡮ฃା஥෺ᣇߢᣢ⍮ߣߔࠆାภಽ㔌ಣℂᚻᴺߩ 1ߟߢ޽ࠆ࿕᦭ࡕ࡯࠼વㅍᴺࠍኻ⽎ߣߔࠆ㧚࿕᦭ࡕ

࡯࠼વㅍᴺߣߪ㧘વ៝〝ⅣႺߩᖱႎࠍㅍା஥࡮ฃା

஥෺ᣇߢᣢ⍮ߣߒߡ޿ࠆߚ߼㧘޽ࠄ߆ߓ߼ផቯߒߚ વ៝〝ⅣႺࠍ․⇣୯ಽ⸃ߔࠆ㧚ߘߩ․⇣୯ಽ⸃ߩ◲

නߥᑼࠍᑼ(1)ߦ␜ߔ㧚

਄ᑼߦ߅޿ߡ㧘਄ઃᷝሼHߪⶄ⚛౒ᓎォ⟎㧘Ȝiߪߘ ࠇߙࠇߩࡄࠬߦ߅ߌࠆ࿕᦭୯ߢ޽ࠆ㧚ᑼ(1)ߩ B ⴕ

೉ߩ౒ᓎⶄ⚛ォ⟎ⴕ೉ࠍㅍା࠙ࠚࠗ࠻㧘Aⴕ೉ߩ౒

ᓎⶄ⚛ォ⟎ⴕ೉ࠍฃା࠙ࠚࠗ࠻ߣߒߡਸ਼▚ߔࠆߎ ߣߦࠃࠅ㧘࠴ࡖࡀ࡞㑆ᐓᷤࠍ㒰෰ߔࠆߎߣ߇น⢻ߣ ߥࠅ㧘ฃାାภߪᰴᑼߣߥࠆ㧚

»¼

« º

¬

»ª

¼

« º

¬

» ª

¼

« º

¬ ª

2 1 2 1 2

1

0 0

Tx Tx Rx

Rx

O O

ᑼ(2)߆ࠄฃାାภߪㅍାାภߦ࿕᦭୯ߩ୯߇ਸ਼▚

ߐࠇߡ޿ࠆߎߣ߆ࠄ㧘ฃାାภߪ࿕᦭୯ߩ୯ߦଐሽ ߔࠆ㧚

Tx1

Tx2

Rx1

Rx2

Z11

Z12

Z21

Z22

»¼

« º

¬

»ª

¼

« º

¬

» ª

¼

« º

¬ ª

2 1 22 21

12 11 2

1

Tx Tx Z Z

Z Z Rx

Rx

Fig.1. MIMO system.

(1)

(2)

H

B B

B B A

A A A Z Z

Z

Z »

¼

« º

¬ ª

» »

¼ º

« «

¬

» ª

¼

« º

¬ { ª

» ¼

« º

¬ ª

22 21

12 11 2 1 22 21

12 11 22 21

12 11

0

O

(3)

/%%&/# ᣇᑼ

MC-CDMAᣇᑼߪ㧘๟ᵄᢙ᦭ല೑↪ࠍน⢻ߣߔࠆ

OFDMᣇᑼߣᄙరធ⛯ᣇᑼࠍน⢻ߣߔࠆCDMAᣇ ᑼࠍⲢวߒߚᣇᑼߢ޽ࠆ㧚ߎߎߢ㧘OFDMᣇᑼ߇⁜

Ꮺၞߥࠨࡉࠠࡖ࡝ࠕߢ࠺࡯࠲ࠍવㅍߔࠆߩߦኻߒ

ߡ㧘MC-CDMAߢߪ࠺࡯࠲ߦ╓ภ♽೉ࠍដߌวࠊߖ

ోࠨࡉࠠࡖ࡝ࠕߦ᜛ᢔߔࠆ㧚ߎߩ⚿ᨐ㧘MC-CDMA ߢߪ㧘OFDMߩో๟ᵄᢙᏪၞ㧔ᐢᏪၞ㧕ࠍ↪޿ࠆߎ ߣߦߥࠆ㧚MC-CDMAᣇᑼߩ․ᓽߪ㧘ㅍା࠺࡯࠲ࠍ

ోࠨࡉࠠࡖ࡝ࠕߦ᜛ᢔߒߡવㅍߔࠆߚ߼㧘๟ᵄᢙㆬ

ᛯᕈࡈࠚ࡯ࠫࡦࠣߦࠃࠆ৻ㇱߩࠨࡉࠠࡖ࡝ࠕߩഠ ൻߩᓇ㗀ࠍฃߌ㔍ߊߥࠆ㧚ߎߩߎߣߪ㧘๟ᵄᢙ࠳ࠗ

ࡃ࡯ࠪ࠴ലᨐ߇ᓧࠄࠇࠆߎߣࠍᗧ๧ߔࠆ㧚

ᧄⓂߢߪ㧘න৻ዪߩାภߦ᜛ᢔ╓ภߩᄙ㊀ᢙࠍᄌ ൻߐߖࠆ╓ภಽഀᄙ㊀ᣇᑼ(CDM㧦Code Division Multiplexing)ߦߟ޿ߡᬌ⸛ࠍⴕ߁㧚

ㅢାຠ⾰ផቯᴺ

ㅢାຠ⾰ផቯᴺߣߒߡࠃߊ↪޿ࠄࠇࠆ߽ߩߪ⍍

ᤨ SNRߦࠃࠆᣇᴺߢ޽ࠆ㧚ߎߩᚻᴺߢߪ㧘ฃା஥

ߢߩାภ㔚ജߣ㔀㖸㔚ജߣߩᲧࠍ᳞߼ࠆߎߣߢࡆ

࠶࠻⺋ࠅ₸ߥߤߩㅢାຠ⾰ផቯ߇น⢻ߣߥࠆ㧚․ߦ

࿕᦭ࡕ࡯࠼વㅍᴺߦࠃࠆ MIMO ࠪࠬ࠹ࡓߢߪ㧘ฃ

ାାภᒝᐲ߇࿕᦭୯ߩᄌേߩᓇ㗀ࠍฃߌࠆߚ߼㧘ߘ ߩᓇ㗀߽฽߼ߚផቯ߇น⢻ߣߥࠆ⍍ᤨ SNRࠍ↪޿

ߚㅢାຠ⾰ផቯᴺߪ᦭ലߢ޽ࠆ㧚

ߒ߆ߒ㧘ᄌ⺞ᣇᑼߣߒߡ MC-CDMA ᣇᑼࠍ↪޿

ߚ႐ว㧘๟ᵄᢙㆬᛯᕈࡈࠚ࡯ࠫࡦࠣⅣႺਅߢߪ

MC-CDMAᣇᑼ․᦭ߩ╓ภ㑆ᐓᷤ߇↢ߓࠆ㧚ߘߩߚ

߼㧘ߎߩ╓ภ㑆ᐓᷤߦࠃࠆᓇ㗀߽฽߼ߚㅢାຠ⾰ផ ቯࠍⴕ߁ᔅⷐ߇޽ࠆ㧚ߒ߆ߒ㧘⍍ᤨ SNRࠍ↪޿ߚ ㅢାຠ⾰ផቯᴺߢߪ╓ภ㑆ᐓᷤࠍ฽ࠎߛផቯࠍߔ ࠆߎߣ߇㕖Ᏹߦ࿎㔍ߢ޽ࠆ㧚

ߘߎߢ㧘ᧄⓂߢߪߎߩ╓ภ㑆ᐓᷤࠍ฽ࠎߛផቯᴺ ߣߒߡᡆૃࡆ࠶࠻⺋ࠅ₸ࠍ↪޿ߚㅢାຠ⾰ផቯᴺ ࠍឭ᩺ߔࠆ㧚ᡆૃࡆ࠶࠻⺋ࠅߣߪ㧘ฃା஥ߢੱὑ⊛

ߦାภࠍഠൻߐߖࠆߎߣߦࠃࠅᓧࠄࠇࠆࡆ࠶࠻⺋

ࠅߩߎߣߢ޽ࠅ㧘ߎࠇߪታ㓙ߩࡆ࠶࠻⺋ࠅߣߪ⇣ߥ ࠆ㧚ߎߩᚻᴺߪ㧘

z ฃାାภࠍഠൻߐߖߚ߽ߩࠍᲧセߔࠆߚ߼㧘ㅍ

ାାภ߇ᣢ⍮ߢ޽ࠆᔅⷐ߇ߥ޿㧘

z ৻⥸⊛ߦታ㓙ߩࡆ࠶࠻⺋ࠅ₸ࠃࠅᡆૃࡆ࠶࠻

⺋ࠅ₸ߩᣇ߇㜞ߊߥࠆߚ߼㧘ዋߥ޿ࠨࡦࡊ࡞ᢙ ߢ♖ᐲ⦟޿ࡆ࠶࠻⺋ࠅ₸ࠍផቯߔࠆߎߣ߇ߢ ߈ࠆ㧘

z ᡆૃࡆ࠶࠻⺋ࠅ߆ࠄታ㓙ߩࡆ࠶࠻⺋ࠅࠍ⋥ធ ផቯߔࠆߚ߼㧘ࡈࠚ࡯ࠫࡦࠣએᄖߩᐓᷤାภߥ ߤߩഠൻⷐ࿃ࠍ฽߼ߚ✚ว⊛ߥࡆ࠶࠻⺋ࠅࠍ ផቯߔࠆߎߣ߇ߢ߈ࠆ㧘

ߣ޿߁․ᓽࠍᜬߟ㧚

ߎߩᡆૃࡆ࠶࠻⺋ࠅࠍ⊒↢ߐߖࠆᚻᴺߣߒߡߪ㧘 Ԙ૏⋧࿁ォࠍട߃ࠆ㧘ԙ㔀㖸ࠍઃടߔࠆ㧘Ԛାภࠍ ᱡ߹ߖࠆ㧘ԛࠨࡦࡊ࡝ࡦࠣὐࠍߕࠄߔ㧘Ԝ್ቯߒ߈

޿୯ࠍࠝࡈ࠮࠶࠻ߐߖࠆ㧘ߥߤߩ᭽ޘߥᣇᴺ߇⠨߃ ࠄࠇࠆ㧚

ᧄⓂߦ߅ߌࠆᡆૃࡆ࠶࠻⺋ࠅߩᬌ಴ᴺࠍFig.2ߦ

␜ߔ㧚ᧄⓂߢߪᡆૃࡆ࠶࠻⺋ࠅ₸ࠍផቯߔࠆ㓙㧘ㅍ

ାାภߪᧂ⍮ߣߔࠆ㧚Fig.2 ߦ߅޿ߡ㧘ฃାߒߚା

ภߦኻߒഠൻಣℂ (Distortion) ࠍᣉߔ㧚ߎߩߣ߈㧘 ฃାߒߚାภࠍห᭽ߩഠൻᚻᴺߢ 2 ࡄ࠲࡯ࡦߩಣ ℂࠍⴕ߁㧚ߎߩࠃ߁ߦഠൻߒߚାภࠍᓳ⺞ߒ㧘ᓧࠄ ࠇߚ2ߟߩࡆ࠶࠻♽೉ࠍᲧセߔࠆߣ㧘ࡆ࠶࠻ߩਇ৻

⥌߇⊒↢ߔࠆ㧚ࡆ࠶࠻ਇ৻⥌߇ᡆૃࡆ࠶࠻⺋ࠅߣߥ ࠆ㧚ߎߩ⊒↢ߒߚᡆૃࡆ࠶࠻⺋ࠅࠃࠅ㧘ᡆૃࡆ࠶࠻

⺋ࠅ₸(PBER㧦Pseudo Bit Error Rate)ࠍ᷹ቯߔࠆߎߣ ߇ߢ߈ࠆ㧚

Transmit data

Distortion

Compare

PBER

Received data

Compare BER

<Transmitter>

<Propagation>

<Receiver>

Fig.2. Measurement method of pseudo bit error rate.

(4)

৻ᣇ㧘ฃାାภࠍഠൻߐߖߥ޿ߢ㧘ᓳ⺞࠺࡯࠲ߣ ㅍା࠺࡯࠲ࠍᲧセߒߡᓧࠄࠇࠆ߽ߩ߇㧘ታ㓙ߩࡆ࠶

࠻⺋ࠅߢ޽ࠅ㧘ߎࠇ߇⌀ߩࡆ࠶࠻⺋ࠅ₸(BER㧦Bit

Error Rate)ߣߥࠆ㧚ታ㓙ߩⅣႺߢߪ㧘ᣢ⍮ߩࡆ࠶࠻

ࠍㅍାߒߥ޿߆߉ࠅ㧘ߎߩ⌀ߩࡆ࠶࠻⺋ࠅ₸ߩ᷹ቯ ߪਇน⢻ߢ޽ࠆ㧚

ᧄⓂߢߪឭ᩺ᣇᑼߩᕈ⢻⹏ଔߩၮḰߣߒߡ↪޿

ࠆ㧚ߒ߆ߒ㧘޽ࠄ߆ߓ߼ᡆૃࡆ࠶࠻⺋ࠅ₸ߣ⌀ߩࡆ

࠶࠻⺋ࠅ₸ߩ㑐ଥࠍ᳞߼࠹࡯ࡉ࡞ࠍ૞ᚑߔࠆߎߣ ߦࠃࠅ㧘ᡆૃࡆ࠶࠻⺋ࠅ₸߆ࠄ⌀ߩࡆ࠶࠻⺋ࠅ₸ࠍ ផቯߔࠆߎߣ߇น⢻ߣߥࠆ㧚

࿕᦭ࡕ࡯࠼વㅍᴺߩ໧㗴ὐߣߘߩ⸃᳿╷

࿕᦭ࡕ࡯࠼વㅍᴺߩ໧㗴ὐ

࿕᦭ࡕ࡯࠼વㅍᴺߢߪ㧘ㅍା஥࡮ฃା஥෺ᣇߢવ

៝〝․ᕈࠍᣢ⍮ߣߒߡ޿ࠆߚ߼㧘޽ࠄ߆ߓ߼․⇣୯ ಽ⸃ࠍⴕ޿㧘ㅍା஥ߢㅍା࠙ࠚࠗ࠻㧘ฃା஥ߢฃା

࠙ࠚࠗ࠻ࠍਸ਼▚ߔࠆߎߣߢ⋥੤ൻࠍⴕ޿㧘࠴ࡖࡀ࡞

㑆ᐓᷤࠍ㒰෰ߔࠆߎߣ߇น⢻ߢ޽ࠆ㧚ߒ߆ߒ㧘ฃା

ାภߩᝄ᏷ߪ࿕᦭୯ߩ୯ߦଐሽߒߡ޿ࠆߚ߼㧘࿕᦭

୯ߩ୯߇ዊߐߊߥࠆߣ㧘ᝄ᏷ߪዊߐߊߥࠅ⚿ᨐߣߒ ߡㅢାຠ⾰߇ഠൻߒߡߒ߹߁㧚৻଀ߣߒߡFig.3ߦ ㅍฃାࠕࡦ࠹࠽ߘࠇߙࠇ2ᧄߣߒߚ႐วߩ㧘╙1࿕

᦭୯ߣ╙2࿕᦭୯ߩ࿕᦭୯ߩᐔᣇᩮߩಽᏓࠍ␜ߔ㧚

Fig.3ߦ␜ߔࠃ߁ߦ㧘╙1࿕᦭୯ߩ୯ߪ1એ਄ߣ

ߥࠆ⏕₸߇㕖Ᏹߦ㜞޿㧚ߘߩߚ߼㧘ㅢାຠ⾰ߦࠃߞ ߡߪ㧘ᄙ୯ᄌ⺞ࠍⴕ޿1࠺࡯࠲޽ߚࠅߩࡆ࠶࠻ᢙࠍ Ⴧടߐߖࠆߎߣߢવㅍኈ㊂ࠍჇടߐߖࠆߎߣ߇ᦼ ᓙߢ߈ࠆ㧚৻ᣇ㧘╙2࿕᦭୯ߪ1એਅߣߥࠆ⏕₸߇ 㕖Ᏹߦ㜞޿ߚ߼㧘ฃାାภߩᝄ᏷ߪㅍାାภߩᝄ᏷

ࠃࠅዊߐ޿⁁ᘒߢᓳ⺞ߔࠆน⢻ᕈ߇㜞ߊߥࠆ㧚․ߦ㧘

๟ᵄᢙㆬᛯᕈࡈࠚ࡯ࠫࡦࠣⅣႺਅߢߪ㧘ࠨࡉࠠࡖ࡝

ࠕߦࠃࠅ࿕᦭୯ߦ߫ࠄߟ߈߇↢ߓࠆߚ߼㧘࿕᦭୯ߩ ୯߇ዊߐ޿ࠨࡉࠠࡖ࡝ࠕߢߪฃାାภߩᝄ᏷߇㕖 Ᏹߦዊߐߊߥࠆน⢻ᕈ߇޽ࠅ㧘⚿ᨐߣߒߡㅢାຠ⾰

߇ഠൻߒߡߒ߹߁㧚ߎߩߎߣ߆ࠄ㧘ᓥ᧪ߩવㅍ೙ᓮ ᣇᑼߢ޽ࠆㆡᔕᄌ⺞߇ᔅߕߒ߽ㆡಾߥᣇᑼߣߪ⸒

޿ಾࠇߥ޿㧚

߹ ߚ 㧘⍍ ᤨ SNR ࠍ ↪ ޿ߚ ㅢ ାຠ ⾰ផ ቯ ᴺ ࠍ

MC-CDMAᣇᑼߦㆡ↪ߒߚ႐ว㧘๟ᵄᢙㆬᛯᕈࡈࠚ

࡯ࠫࡦࠣਅߢߪ MC-CDMA ᣇᑼ․᦭ߩ╓ภ㑆ᐓᷤ

ࠍ฽ࠎߛផቯ߇㕖Ᏹߦ࿎㔍ߣߥࠆ㧚

ᡆૃࡆ࠶࠻⺋ࠅ₸ផቯᴺ

೨▵ߩ໧㗴ὐࠍ⸃᳿ߔࠆᚻᴺߩ৻ߟߣߒߡ㧘ᡆૃ

ࡆ࠶࠻⺋ࠅ₸ߦၮߠߊ MC-CDMA ߩ╓ภᄙ㊀ൻߦ ࠃࠆㆡᔕવㅍ೙ᓮ߇޽ࠆ㧚ᡆૃࡆ࠶࠻⺋ࠅ₸ߩផቯ ᴺߪ㧘ࡈࠚ࡯ࠫࡦࠣߦࠃࠆഠൻߩઁ㧘ᐓᷤߥߤߦࠃ ࠆഠൻߥߤฦ⒳ߩഠൻⷐ࿃߽฽ࠎߛ႐วߦኻߒߡ

߽ᱜ⏕ߥផቯ߇น⢻ߢ޽ࠆ㧚ߎߩߚ߼㧘๟ᵄᢙㆬᛯ ᕈࡈࠚ࡯ࠫࡦࠣਅߢߩ MC-CDMA ᣇᑼߩ․ᕈ⹏ଔ ߦ㕖Ᏹߦ᦭ലߢ޽ࠆ㧚

ᡆૃࡆ࠶࠻⺋ࠅࠍ⊒↢ߐߖࠆᚻᴺߪ2.3▵ߢ߽⺑

᣿ߒߚࠃ߁ߦ᭽ޘߥᚻᴺ߇޽ࠆ㧚ᧄⓂߢߪ㧘ᄌ⺞ᣇ

ᑼߣߒߡ MC-CDMA ᣇᑼࠍ↪޿ࠆߚ߼㧘♖ᐲ⦟ߊ

ᡆૃࡆ࠶࠻⺋ࠅࠍ⊒↢ߐߖࠆߚ߼ߦߪ㧘ㅒ᜛ᢔᓟߦ ഠൻಣℂࠍട߃ࠆᔅⷐ߇޽ࠆ㧚߹ߚ㧘ᧄⓂߢߪ QPSK(Quadrature Phase Shift Keying)ᄌ⺞ߢᬌ⸛ࠍ ⴕ߁ߚ߼㧘૏⋧ᚑಽࠍ฽ࠎߛഠൻಣℂ߇ᔅⷐߣߥࠆ㧚 ߎࠇࠄߩߎߣ߆ࠄ㧘ᡆૃࡆ࠶࠻⺋ࠅࠍ⊒↢ߐߖࠆᚻ ᴺߣߒߡ㧘૏⋧࿁ォࠍ↪޿ߚഠൻᚻᴺࠍขࠅ޽ߍࠆ㧚

Fig.4 ߦ૏⋧࿁ォࠍ↪޿ߚᡆૃࡆ࠶࠻⺋ࠅ⊒↢ᚻ

ᴺࠍ␜ߔ㧚ห࿑(a)ߪฃାାภ㧘ห࿑(b)ߪᡆૃࡆ࠶

࠻⺋ࠅߣ್ቯߐࠇࠆ㗔ၞࠍ␜ߒߡ޿ࠆ㧚ߎߩࡆ࠶࠻

⺋ࠅ⊒↢ᴺߢߪ㧘ߪߓ߼ߦฃାାภࠍㅒ᜛ᢔಣℂߒ㧘 ߘߩᓟ㧘૏⋧࿁ォࠍട߃ߡାภഠൻߐߖࠆ㧚ߎߩ૏

⋧࿁ォߪ㧘್ቯゲࠍ࿁ォߐߖࠆߎߣߣห╬ߢ޽ࠆ㧚 ห࿑(b)ߦ␜ߔࠃ߁ߦ Phase shift(1)ߢ್ቯゲࠍ㧙ș°

Fig.3. Distribution of square root of eigen value.

(5)

࿁ォߐߖߚ߽ߩࠍᓳ⺞ߔࠆ৻ᣇߢ㧘Phase shift(2)ߢ

್ቯゲࠍș°࿁ォߐߖߚ߽ߩࠍᓳ⺞ߔࠆ㧚

ߎࠇࠄࠃࠅᓧࠄࠇߚࡆ࠶࠻♽೉ࠍᲧセߒ㧘ਇ৻⥌

ࡆ࠶࠻ࠍᡆૃࡆ࠶࠻⺋ࠅߣߔࠆ㧚ห࿑(b)ߩ଀ߢߪ㧘㤥ὐߢ␜ߐࠇߚࡆ࠶࠻߇ᡆૃࡆ࠶࠻⺋ࠅߣߥࠆ㧚

ឭ᩺ᣇᑼߩ․ᕈ⹏ଔ ࠪࡒࡘ࡟࡯࡚ࠪࡦࠪࠬ࠹ࡓࡕ࠺࡞

ឭ᩺ᣇᑼߩᕈ⢻ࠍቯ㊂⊛ߦ⹏ଔߔࠆߚ߼ߦ⸘▚

ᯏࠪࡒࡘ࡟࡯࡚ࠪࡦࠍⴕߞߚ㧚ࠪࡒࡘ࡟࡯࡚ࠪࡦࠪ

ࠬ࠹ࡓߩో૕᭴ᚑࠍ Fig.5(a)ߦ㧘ࡑ࡞࠴ࠠࡖ࡝ࠕߩ MIMO ߩㅍฃାㇱߩ᭴ᚑࠍห(b)ߦ␜ߔ㧚߹ߚ㧘ࠪ

ࡒࡘ࡟࡯࡚ࠪࡦ⻉రࠍTable 1ߦ␜ߔ㧚

Fig.5(a)ߦ␜ߔࠃ߁ߦ࠺࡯࠲ฃାዪߢߪ㧘ߘߩㅍ

ା♽ߦ߅޿ߡ࿁✢ຠ⾰⹜㛎ߩߚ߼ߦ࠺࡯࠲ߩ⊒↢㧘

ᄌ⺞㧘MC-CDMA ㅍା㧘MIMO ㅍାߥߤߩಣℂࠍ

ࠍⴕߞߡ㧘࠺࡯࠲ฃାዪߦ㔚ᵄࠍㅍାߔࠆ㧚࠺࡯࠲

ㅍାዪߢߪ㧘ߘߩฃା♽ߦ߅޿ߡ MIMO ฃା㧘

MC-CDMAฃାߩಣℂࠍⴕߞߚᓟ㧘࿁✢ຠ⾰ផቯࠍ

ⴕ߁㧚ߎߩ࿁✢ຠ⾰ផቯߢߪ㧘࠺࡯࠲ฃାዪߩㅍା

࠺࡯࠲ࠍᧂ⍮ߣߒ㧘ᡆૃࡆ࠶࠻⺋ࠅ₸߆ࠄ⌀ߩࡆ࠶

࠻⺋ࠅ₸ࠍផቯߒߡ޿ࠆ㧚ߎߩ⌀ߩࡆ࠶࠻⺋ࠅ₸߇ 10^-3એਅߣߥࠆᄙ㊀ᢙࠍ▚಴ߒ㧘╓ภᄙ㊀ൻߦࠃࠆ ㆡᔕવㅍ೙ᓮࠍⴕ߁㧚ߥ߅㧘ᄙ㊀ᢙߪ1㨪32ߣߒ㧘

᧦ઙࠍḩߚߐߥ޿႐ว㧘ㅍାOFFࠍㆬᛯߔࠆ㧚

࠺࡯࠲ㅍାዪߩㅍା♽ߢߪ㧘ᄙ㊀ᢙߦᔕߓߡㅍା

࠺࡯࠲ࠍ↢ᚑߒ㧘ᄌ⺞㧘MC-CDMA ㅍା㧘MIMO ㅍାߩಣℂࠍⴕߞߡ㧘࠺࡯࠲ฃାዪߦะߌߡ㔚ᵄࠍ ㅍାߔࠆ㧚ߎߎߢ㧘ㅍା㔚ജߪᄙ㊀ᢙߦࠃࠄߕ৻ቯ

ߦ ⸳ ቯ ߔ ࠆ 㧚 ࠺ ࡯ ࠲ ฃ ା ዪ ߩ ฃ ା ♽ ߢ ߪ 㧘

MIMO-MC-CDMA ߩฃାಣℂࠍⴕߞߚᓟ㧘․ᕈ⹏

ଔࠍⴕ߁㧚․ᕈ⹏ଔߦߪ㧘ࡆ࠶࠻⺋ࠅ₸㧘ࡈ࡟࡯ࡓ

⺋ࠅ₸㧘ࠬ࡞࡯ࡊ࠶࠻ߥߤࠍ↪޿ࠆ㧚߹ߚ㧘Fig.5 (b) ߦ␜ߔࠃ߁ߦ㧘વㅍ࠴ࡖࡀ࡞ߏߣ㧘ࠨࡉࠠࡖ࡝ࠕߏ ߣߩㅍା㊀ߺߠߌ㧘ฃା㊀ߺߠߌࠍⴕߞߡ޿ࠆ㧚

Data Receiving Station

Receiver Side Transmitter Side Data Transmitting Station

Receiver Side Transmitter Side

MIMO

MIMO MC-CDMA

MC-CDMA Modulation

Link Quality Estimation

Test Data

Demo.

MIMO

MIMO MC-CDMA

MC-CDMA Modulation

Data

Multiplexing Control

Performance Estimation

(a) Configuration of multi-carrier MIMO system

IFFT GI Insert IFFT

Transmit Weighting Transmit Weighting

IFFT GI

Insert

Antenna #1

Ante nna #2 Subcarrier Signal

Input

RF Signal Output

Channel #1 Channe l #2

GI Insert Transmit

Weighting Re ceive Weighting

FFT GI

Remove

Ante nna #1 Antenna #2 Subcarrier Signal

Output

RF Signal input

Channel #1 Channel #2

(b) Transmitter and receiver configuration Fig.5. System configurations.

Table 1. Simulation parameters.

Modulation QPSK

MC-CDMA 64 subcarrier, 48 symbol packet, 100 k symbol/sec transmission rate MIMO 2x2 antenna, multi-carrier MIMO,

Eigen-mode transmission,

Propagation Quasi-static fading in packet duration, Non-coherent fading between packet, Delay time=1 sample, DUR=0,3,6,12 [dB], Fig.4. Generation of pseudo error.

(a) Received data (b) Area of pseudo error Phase shift(2)

(ǰq) Phase shift(1)

(㧙ǰq)

(6)

$'4 ኻ 2$'4 ߩ㑐ଥ

ᡆૃࡆ࠶࠻⺋ࠅ⊒↢ߩ૏⋧࿁ォ㊂

ࠪࡒࡘ࡟࡯࡚ࠪࡦߦࠃࠅ㧘ᡆૃࡆ࠶࠻⺋ࠅߩ⊒↢

ߦㆡᒰߥ૏⋧࿁ォ㊂ߩᬌ⸛ࠍAWGN(Additive White Gaussian Noise)ⅣႺਅߢⴕߞߚ㧚Fig.6ߦ૏⋧࿁ォ㊂ ߣߒߡฃା஥ߢǸ/18㧘Ǹ/12㧘Ǹ/10㧘Ǹ/9㧘Ǹ/6ߩ

૏⋧࿁ォࠍട߃ߚ႐วߩ MC-CDMA ߩᡆૃࡆ࠶࠻

⺋ࠅ₸ߣ⌀ߩࡆ࠶࠻⺋ࠅ₸ߩ․ᕈࠍ␜ߔ㧚ోߡߩ૏

⋧࿁ォ㊂ߦ߅޿ߡMC-CDMAߩᄙ㊀ᢙߪ32ߢᬌ⸛

ࠍⴕߞߚ㧚

૏⋧࿁ォ㊂Ǹ/6ߪ㧘ᡆૃࡆ࠶࠻⺋ࠅ₸ߦᄢ߈ߥᄌ ൻ߇ߥߊផቯߩᗵᐲ߇ᖡߊߥࠆߚ߼㧘ㆡಾߥ೙ᓮ߇ ߢ߈ߥ޿ߣ੍ᗐߐࠇࠆ㧚߹ߚ㧘૏⋧࿁ォ㊂Ǹ/18ߪ㧘

⌀ߩࡆ࠶࠻⺋ࠅ₸߇ૐ޿㗔ၞࠍផቯߔࠆߚ߼㧘ᄙߊ ߩࡆ࠶࠻ࠍવㅍߔࠆᔅⷐ߇޽ࠅ㧘ല₸⊛ߦផቯߔࠆ ߚ߼ߦߪㆡಾߢߪߥ޿㧚ߘߩߚ߼㧘ᧄⓂߢߪ㧘ㅢା

ߦᔅⷐߥࡆ࠶࠻⺋ࠅ₸ߩ਄㒢ࠍ⠨ᘦߒ㧘ೋᦼᬌ⸛ߣ ߒߡ૏⋧࿁ォ㊂ࠍǸ/10ߣߒߚ㧚

૏⋧࿁ォ㊂ߦ߅ߌࠆฦᄙ㊀ᢙߩ․ᕈ ߎߩ▵ߢߪ㧘ߘߩ૏⋧࿁ォ㊂ߦ߅ߌࠆฦᄙ㊀ᢙߩ BER ኻ PBER ․ᕈࠍ⸘▚ᯏࠪࡒࡘ࡟࡯࡚ࠪࡦߦࠃ ࠅᬌ⸛ߒߚ㧚

Fig.7 ߦ AWGN ߩㆃᑧ DUR(Desire to Undesired Ratio㧦⋥ធᵄኻㆃᑧᵄ㔚ജᲧ)㧦6[dB]㧘ㆃᑧࠨࡦࡊ

࡞ᢙ㧦1ࠨࡦࡊ࡞ߦ߅ߌࠆฦᄙ㊀ᢙߩBERኻPBER

․ᕈࠍ␜ߔ㧚ห࿑(a)ߪฦᄙ㊀ᢙߦኻᔕߒߚBERኻ PBER․ᕈ㧘ห࿑(b)ߪPBERߩᄙ㊀ᢙࠍ32ߣ࿕ቯ

ߒ㧘BERߩᄙ㊀ᢙߪᄌᢙߣߒߚ႐วߩBERኻPBER

․ᕈߢ޽ࠆ㧚ߎߎߢ㧘ㆃᑧ DUR=6[dB]ߣߪ㧘ㆃᑧ ᵄߩ㔚ജߪ⋥ធᵄߩ㔚ജߩ1/2ߢ޽ࠆ㧚ห࿑(a)߆ࠄ㧘 ᡆૃࡆ࠶࠻⺋ࠅ₸ࠍ᷹ቯߒ㧘MC-CDMAߩᡆૃࡆ࠶

࠻⺋ࠅ₸ߣ⌀ߩࡆ࠶࠻⺋ࠅ₸ߩ․ᕈࠍ࠹࡯ࡉ࡞ߣ ߒߡෳᾖߔࠆߎߣߦࠃࠅ㧘ฦᄙ㊀ᢙߦ߅ߌࠆ⌀ߩࡆ

࠶࠻⺋ࠅ₸ࠍផቯߔࠆߎߣ߇ߢ߈ࠆ㧚ห࿑(b)ߦ߅޿

ߡ㧘ㅢାຠ⾰ផቯߩᄙ㊀ᢙࠍ 32 ߣߒ㧘ฃା஥ߢ PBER=410^-3ߣ᷹ቯߐࠇߚ႐ว㧘PBER=410^-3ߩ

૏⟎ߦ⌕⋡ߔࠆߣ㧘BER=110^-3એਅߣߥࠆᄙ㊀ᢙ ߪ24ߢ޽ࠆߎߣ߇ࠊ߆ࠆ㧚

$'4 ኻ 2$'4 ߩ &74 ଐሽᕈ

Fig.8 ߦᡆૃࡆ࠶࠻⺋ࠅ₸ࠍ᷹ቯߔࠆߚ߼ߩᄙ㊀

ᢙࠍ32ߣ࿕ቯߒ㧘ㆃᑧᵄ߇ሽ࿷ߒߥ޿AWGNⅣႺ

䎔䎓^䎐䎗䎔䎓^䎐䎖䎔䎓^䎐䎕

䎔䎓^䎐䎖䎔䎓^䎐䎕

䎥䎨䎵

䎳䎥䎨䎵

䎃

䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎔䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎗䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎛䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎔䎙䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎕䎓䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎕䎗䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎖䎕

(b) Average BER versus PBER

Fig.7. Average BER versus PBER. (DUR : 6[dB])

䎔䎓^䎐䎛䎔䎓^䎐䎙䎔䎓^䎐䎗䎔䎓^䎐䎕䎔䎓^䎓

䎔䎓^䎐䎘䎔䎓^䎐䎗䎔䎓^䎐䎖䎔䎓^䎐䎕䎔䎓^䎐䎔䎔䎓^䎓

䎥䎨䎵

䎳䎥䎨䎵

䎃

䎃䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎔

䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎕䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎗䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎛䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎔䎙䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎖䎕

(a) Average BER versus PBER

䎔䎓^䎐䎙䎔䎓^䎐䎗䎔䎓^䎐䎕䎔䎓^䎓

䎔䎓^䎐䎗䎔䎓^䎐䎖䎔䎓^䎐䎕䎔䎓^䎐䎔䎔䎓^䎓

䎥䎨䎵

䎳䎥䎨䎵

䎃

䕨䎒䎔䎛䕨䎒䎔䎕䕨䎒䎔䎓䕨䎒䎜䕨䎒䎙

Fig.6. Average BER versus PBER over AWGN.

(7)

߅ࠃ߮ㆃᑧᵄ߇ሽ࿷ߔࠆAWGNⅣႺߦ߅ߌࠆBER ኻPBERߩ․ᕈࠍ␜ߔ㧚ߎߎߢ㧘ㆃᑧᵄ߇ሽ࿷ߔࠆ AWGNⅣႺߩㆃᑧDURߪઍ⴫⊛ߥ୯ߣߒߡ0[dB]

߅ࠃ߮6[dB]ߣߒߚ㧚

ห࿑ࠃࠅ㧘ᄙ㊀ᢙࠍ࿕ቯߒߚ႐ว㧘ㆃᑧᵄߩሽ࿷

߅ࠃ߮ㆃᑧDURߩᄢ߈ߐߦଐሽߔࠆߎߣߥߊ㧘৻

ቯߩ․ᕈࠍ⛽ᜬߒߡ޿ࠆߎߣ߇ࠊ߆ࠆ㧚ߎࠇߪ㧘ฃ

ାᯏߦ߅޿ߡഠൻಣℂࠍⴕߞߚ㓙㧘ㆃᑧᵄߩᓇ㗀߇ AWGNߦ߅ߌࠆᓇ㗀ߣ߶߷ห╬ߣߥߞߡ޿ࠆߚ߼㧘 ߘࠇߙࠇߩ․ᕈ߇ߕࠇߡ޿ࠆߛߌߢ޽ࠅ㧘৻ቯߩ․

ᕈࠍ଻ߞߡ޿ࠆߣ⠨߃ࠄࠇࠆ㧚

ឭ᩺ᣇᑼߩ᦭ലᕈ

ឭ᩺ᣇᑼߩ᦭ലᕈࠍ⹏ଔߔࠆߚ߼㧘ࡈࠚ࡯ࠫࡦࠣ

ⅣႺਅߢߩવㅍ․ᕈ㧔ࡈ࡟࡯ࡓ⺋ࠅ₸㧘ࠬ࡞࡯ࡊ࠶

࠻ߥߤ㧕ࠍ⸘▚ᯏࠪࡒࡘ࡟࡯࡚ࠪࡦߢ᳞߼ߚ㧚ߥ߅㧘

ࠪࡒࡘ࡟࡯࡚ࠪࡦߦᒰߚߞߡߪ㧘ㆃᑧDUR㧦6[dB]㧘 ㆃᑧࠨࡦࡊ࡞ᢙ㧦1ࠨࡦࡊ࡞ߦ߅ߌࠆBERኻPBER

․ᕈࠍ࠹࡯ࡉ࡞ߣߒߡ૶↪ߒߚ㧚

ࡈ࡜࠶࠻ࡈࠚ࡯ࠫࡦࠣⅣႺਅߩવㅍ․ᕈ ࡈ࡜࠶࠻ࡈࠚ࡯ࠫࡦࠣⅣႺਅߦ߅ߌࠆવㅍ․ᕈ ࠍFig.9ߦ␜ߔ㧚ห࿑(a)ߪFER(Frame Error Ratio:ࡈ

࡟࡯ࡓ⺋ࠅ₸)․ᕈ㧘ห࿑(b)ߦࠬ࡞࡯ࡊ࠶࠻․ᕈࠍ

␜ߔ㧚߹ߚ㧘ὐ✢ߪㅍା OFF ࠍㆡ↪ߒߥ޿႐ว㧘 ታ✢ߪㅍାOFFࠍㆡ↪ߒߚ႐วߩ․ᕈߢ޽ࠆ㧚

ห࿑(a)ࠃࠅ㧘ㅍାOFFࠍㆡ↪ߔࠆߎߣߢFER߇ ᡷༀߐࠇࠆߎߣ߇ಽ߆ࠆ㧚 ৻ᣇ㧘ห࿑(b)ࠃࠅ㧘ㅍ

ା OFF ࠍㆡ↪ߒߚ႐วߣㆡ↪ߒߡ߽㧘ࠬ࡞࡯ࡊ࠶

࠻․ᕈߦᄢ߈ߥᄌൻߪߥ޿㧚ߎࠇߪ㧘ㅍା OFF ೙ ᓮࠍㆡ↪ߒㅍା OFF ߣߥࠆ⁁ᴫਅߢߪ㧘ࡈ࡟࡯ࡓ

⺋ࠅ߇⊒↢ߔࠆߎߣ߇ᄙߊ㧘ㅍା OFF ࠍㆡ↪ߒߥ ߊߡ߽ߘߩࡄࠤ࠶࠻߇ᑄ᫈ߐࠇࠆߚ߼ߢ޽ࠆ㧚

߹ߚ㧘ᐔဋSNR ߇ᄢ߈ߊߥࠆߦߟࠇࠬ࡞࡯ࡊ࠶

࠻߇Ⴧടߒߡ޿ࠆ㧚ߎࠇߪ㧘╙2࿕᦭ࡄࠬߩࠬ࡞࡯

ࡊ࠶࠻ߩჇടߦࠃࠆ߽ߩߢ޽ࠆ㧘ߥ߅㧘╙1࿕᦭ࡄ

ࠬߩᄙ㊀ᢙߪోߡߩᐔဋSNRߢ߶߷32ࠍ⛽ᜬߒߡ

޿ࠆ㧚

ㆬᛯᕈࡈࠚ࡯ࠫࡦࠣⅣႺਅߩવㅍ․ᕈ ᰴߦ๟ᵄᢙㆬᛯᕈࡈࠚ࡯ࠫࡦࠣⅣႺਅߦ߅ߌࠆ વㅍ․ᕈࠍFig.10ߦ␜ߔ㧚ㆃᑧDUR㧦6[dB]㧘ㆃᑧ ࠨࡦࡊ࡞ᢙ㧦1ࠨࡦࡊ࡞ߣߒߚ㧚ߎߎߢ㧘ὐ✢ߪㅍ

ାOFFࠍㆡ↪ߒߥ޿႐ว㧘ታ✢ߪㅍାOFFࠍㆡ↪

ߒߚ႐วߩࠪࡒࡘ࡟࡯࡚ࠪࡦ⚿ᨐߢ޽ࠆ㧚ห࿑(a)

䎔䎓^䎐䎙䎔䎓^䎐䎗䎔䎓^䎐䎕䎔䎓^䎓

䎔䎓^䎐䎙䎔䎓^䎐䎘䎔䎓^䎐䎗䎔䎓^䎐䎖䎔䎓^䎐䎕䎔䎓^䎐䎔䎔䎓^䎓

䎥䎨䎵

䎳䎥䎨䎵

䎃

䏚䎒䏒䎃䏇䏈䏏䏄䏜䏚䏄䏙䏈䏚䎃䏇䏈䏏䏄䏜䏚䏄䏙䏈䎋䎧䎸䎵䎝䎓䎾䏇䎥䏀䎌䏚䎃䏇䏈䏏䏄䏜䏚䏄䏙䏈䎋䎧䎸䎵䎝䎙䎾䏇䎥䏀䎌

Fig.8. Comparison of average BER versus PBER.

(with and without delay)

Fig.9. Transmission characteristics in flat fading.

䎓䎘䎔䎓䎔䎘䎕䎓䎕䎘䎖䎓

䎓䎘䎔䎓䎔䎘䎕䎓䎕䎘

䎤䏙䏈䏕䏄䏊䏈䎃䎶䎱䎵䎃䎾䏇䎥䏀

䎷䏋䏕䏒䏘䏊䏋䏓䏘䏗䎃䎾䎰䏅䏓䏖䏀

䎃

䏚䎒䏒䎃䏗䏕䏄䏑䏖䏐䏌䏗䎃䏒䏉䏉䏚䎃䏗䏕䏄䏑䏖䏐䏌䏗䎃䏒䏉䏉

(b) Throughput characteristic

䎩䎨䎵

䎃

(a) FER characteristic

(8)

ߦBER(Bit Error Ratio:ࡆ࠶࠻⺋ࠅ₸)․ᕈ㧘ห࿑(b) ߦFER․ᕈ㧘ห࿑(c)ߦࠬ࡞࡯ࡊ࠶࠻․ᕈ㧘ห࿑(d) ߦㅍାOFF ࠍㆡ↪ߒߚ႐วߩ╙2࿕᦭ࡄࠬߦ߅ߌ ࠆᄙ㊀ᢙߩ⊒↢⏕₸ࠍ␜ߔ㧚ห࿑(a)ࠃࠅ㧘ㅍାOFF ࠍⴕ߁ߎߣߢోߡߩᐔဋ SNRߦ߅޿ߡࡆ࠶࠻⺋ࠅ

₸ࠍ10^-3એਅߦ೙ᓮߢ߈ߡ޿ࠆߎߣ߇ࠊ߆ࠆ㧚߹ߚ㧘 ߘࠇߦࠃࠅ FER ․ᕈࠍᡷༀߔࠆߎߣ߇ߢ߈ߡ޿ࠆ (ห࿑(b)ෳᾖ)㧚

৻ᣇ㧘ห࿑(d) ࠃࠅ㧘ࠬ࡞࡯ࡊ࠶࠻․ᕈߪ㧘ㅍା

OFFߣㅍାOFFߩ႐วߢᄌൻ߇ߥ޿ߎߣ߆ࠄ㧘ㅍ

ା OFF ߩኻ⽎ߣߥࠆࡈ࡟࡯ࡓߪ㧘ࡈ࡟࡯ࡓ⺋ࠅߦ ࠃࠅࡄࠤ࠶࠻߇⎕᫈ߐࠇߡ޿ࠆߎߣ߇ࠊ߆ࠆ㧚߹ߚ㧘 ᐔဋ SNRߩჇടߦኻߔࠆࠬ࡞࡯ࡊ࠶࠻ߩჇടߪ㧘

╙ 2 ࿕᦭ࡄࠬߩࠬ࡞࡯ࡊ࠶࠻ߩჇടߦࠃࠆ߽ߩߢ

޽ࠆ㧚ߘߩ╙2ࡄࠬߩᄙ㊀ᢙߩ⊒↢⏕₸ࠍห࿑(d)

ߦ␜ߒߡ޿ࠆ㧚ห࿑߆ࠄᐔဋSNR ߇Ⴧടߔࠆߣ㧘 ᄙ㊀ᢙߩ⊒↢ഀว߇Ⴧടߔࠆߣߣ߽ߦㅍା OFF ߩ

ഀว߇ᷫዋߒߡ޿ࠆ㧚ߒ߆ߒ㧘ᐔဋ SNR:30[dB]ߦ ߅޿ߡ߽╙2࿕᦭ࡄࠬߦ߅ߌࠆㅍାOFFߩഀวߪ 45%⒟ᐲ޽ࠆ㧚ߎࠇߪᡆૃࡆ࠶࠻⺋ࠅߩ᷹ቯߦ߅ߌ ࠆᄙ㊀ᢙߩ⸳ቯ߇32ߢ޽ࠆߚ߼㧘╓ภ㑆ᐓᷤߦࠃ ࠅታ㓙ߩᄙ㊀ᢙߦ⸳ቯߐࠇߚ႐วߦᲧߴߡ⌀ߩࡆ

࠶࠻⺋ࠅ₸ࠍㆊᄢ⹏ଔߔࠆߚ߼ߢ޽ࠆ㧚ߥ߅㧘ㆊᄢ

⹏ଔߪ㧘ㅢାຠ⾰ࠍ⏕ታߦ⛽ᜬߔࠆⷰὐ߆ࠄ᦭ലߣ

߽⸒߃ࠆ㧚

વㅍ․ᕈߩ &74 ଐሽᕈ

ߎߎߢߪ㧘ᧄⓂߢ૶↪ߒߡ޿ࠆ࠹࡯ࡉ࡞ߩㆃᑧ DUR ߦኻߔࠆଐሽᕈࠍᬌ⸛ߔࠆ㧚ㆃᑧ DUR㧦 0,3,6,12[dB]ߦ߅ߌࠆવㅍ․ᕈࠍFig.11ߦ␜ߔ㧚ห࿑

䎃

䎃䏚䎒䏒䎃䏗䏕䏄䏑䏖䏐䏌䏗䎃䏒䏉䏉䏚䎃䏗䏕䏄䏑䏖䏐䏌䏗䎃䏒䏉䏉

(c) Throughput characteristic

(d) Distribution of number of multicode of second eigenpath (DUR:6[dB])

䎩䎨䎵

䎃

(b) FER characteristic

䎥䎨䎵

䎃

(a) BER characteristic

䎓䎕䎗䎙䎛䎔䎓䎔䎕䎔䎗䎔䎙䎔䎛䎕䎓䎕䎕䎕䎗䎕䎙䎕䎛䎖䎓䎓

䎕䎓䎗䎓䎙䎓䎛䎓䎔䎓䎓

䎳䏕䏒䏅䏄䏅䏌䏏䏗䏌䏜䎃䎾䎈䏀

䎃

䏗䏕䏄䏑䏖䏐䏌䏗䎃䏒䏉䏉䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎔䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎕䱊䎖䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎗䱊䎚䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎛䱊䎔䎘䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎔䎙䱊䎖䎔䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎖䎕

Fig.10. Transmission characteristic in frequency-selective fading.

(9)

䎓䎘䎔䎓䎔䎘䎕䎓䎕䎘䎖䎓䎓

䎘䎔䎓䎔䎘䎕䎓䎕䎘

䎃

䎧䎸䎵䎝䎓䎾䏇䎥䏀䎧䎸䎵䎝䎖䎾䏇䎥䏀䎧䎸䎵䎝䎙䎾䏇䎥䏀䎧䎸䎵䎝䎔䎕䎾䏇䎥䏀

(a)ߪFER․ᕈ㧘ห࿑(b)ߪࠬ࡞࡯ࡊ࠶࠻․ᕈ㧘ห࿑

(c)ߪ㧘 DUR: 12[dB]ߦ߅ߌࠆ╙2࿕᦭ࡄࠬߩ⊒↢ഀ

วߢ޽ࠆ㧚

ห࿑(a)ࠃࠅ㧘ㆃᑧDURࠍᄌൻߐߖߡ߽FER․ᕈ

ߦᄢ߈ߥᄌൻߪߥ޿㧚ߎߩߎߣ߆ࠄ㧘╓ภᄙ㊀ൻߦ ࠃࠆㆡᔕવㅍ೙ᓮ߇ㆡಾߢ޽ࠆߎߣ߇ࠊ߆ࠆ㧚

৻ᣇ㧘ห࿑(b)ࠃࠅࠬ࡞࡯ࡊ࠶࠻․ᕈߪㆃᑧ DUR ߇ᄢ߈ߊߥࠆ㧘ߔߥࠊߜㆃᑧᵄߩᓇ㗀߇ዊߐߊߥࠆ

䎩䎨䎵

䎃

䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎔䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎗䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎛䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎔䎘䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎔䎙䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎔䎚䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎕䎗䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎖䎕

䏗䏋䏕䏒䏘䏊䏋䏓䏘䏗䎃䎾䎰䏅䏓䏖䏀

䎃

䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎔䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎗䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎛䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎔䎘䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎔䎙䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎔䎚䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎕䎗䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎖䎕

䎔䎓䎕䎓䎖䎓䎗䎓䎘䎓䎙䎓䎚䎓䎛䎓䎜䎓䎔䎓䎓

䎳䏕䏒䏅䏄䏅䏌䏏䏗䏜䎃䎾䎈䏀

䎃

䏗䏕䏄䏑䏖䏐䏌䏗䎃䏒䏉䏉䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎔䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎕䱊䎖䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎗䱊䎚䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎛䱊䎔䎘䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎔䎙䱊䎖䎔䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎖䎕

(c) Distribution of number of multicode of second eigenpath (Number of codes:16) Fig.12. Transmission characteristics in frequency-

selective fading when number of multiplexing is varied.

䎕䎓䎗䎓䎙䎓䎛䎓䎔䎓䎓

䎳䏕䏒䏅䏄䏅䏌䏏䏌䏗䏜䎃䎾䎈䏀

䎃

䎃䏗䏕䏄䏑䏖䏐䏌䏗䎃䏒䏉䏉䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎔䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎕䱊䎖䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎗䱊䎚䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎛䱊䎔䎘䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎔䎙䱊䎖䎔䎰䏘䏏䏗䏌䏓䏏䏈䏛䏌䏑䏊䎃䎖䎕

(c) Distribution of number of multicode of second eigenpath (DUR:12[dB])

Fig.11. Transmission characteristics in frequency- selective fading when DUR is varied.

䎩䎨䎵

䎃

䎃䎧䎸䎵䎝䎓䎾䏇䎥䏀䎧䎸䎵䎝䎖䎾䏇䎥䏀䎧䎸䎵䎝䎙䎾䏇䎥䏀䎧䎸䎵䎝䎔䎕䎾䏇䎥䏀

(10)

ߦᓥ޿ࠬ࡞࡯ࡊ࠶࠻ߪะ਄ߒߡ޿ࠆ㧚ߎࠇߪ㧘╙2

࿕᦭ࡄࠬߩჇടߦࠃࠆ߽ߩߢ޽ࠆ㧚

ㅢାຠ⾰ផቯߦ߅ߌࠆᄙ㊀ᢙߩᬌ⸛

ᡆૃ⺋ࠅ₸ߩ᷹ቯߩߚ߼ߩᄙ㊀ᢙߩ⸳ቯࠍ32ߣ ߒߡ㧘╓ภᄙ㊀ൻߦࠃࠆㆡᔕવㅍ೙ᓮࠍⴕߞߚ႐ว㧘 ㆃᑧDUR㧦6[dB]ߦ߅޿ߡ╙2࿕᦭ࡄࠬߩㅍାOFF ߇⚂45%ߩഀวߢ⊒↢ߔࠆߎߣ߇ࠊ߆ߞߚ㧚ߎߩ▵

ߢߪ㧘Fig.12ߦࠃࠅᡆૃ⺋ࠅ₸ߩ᷹ቯߩߚ߼ߩᄙ㊀

ᢙߩ⸳ቯߩᦨㆡൻߦ㑐ߒߡᬌ⸛ࠍⴕ߁㧚

ห࿑(a)ࠃࠅᄙ㊀ᢙ߇16એ਄ߦߥࠆߣ㧘╓ภᄙ㊀ ൻߦࠃࠆㆡᔕવㅍ೙ᓮᓟߩࡈ࡟࡯ࡓ⺋ࠅ₸ߦᄢ߈ ߥᄌൻ߇ߥ޿㧚ߎࠇߪ㧘ᡆૃ⺋ࠅ₸ߩ᷹ቯߩߚ߼ߩ ᄙ㊀ᢙߩ⸳ቯࠍ16એ਄ߣߔࠆߣ㧘⌀ߩ⺋ࠅ₸ࠍᄢ

᏷ߦㆊዊ⹏ଔߔࠆෂ㒾ᕈ߇ᷫዋߔࠆߚ߼ߢ޽ࠆ㧚

߹ߚ㧘ห࿑(b)ࠃࠅ㧘ᄙ㊀ᢙߩ⸳ቯࠍᄙߊߔࠆߣ㧘 ᐔဋࠬ࡞࡯ࡊ࠶࠻ߪᷫዋߔࠆ㧚ߎࠇߪ㧘ᄙ㊀ᢙߩ⸳

ቯࠍᄢ߈ߊߔࠆߣ㧘⌀ߩ⺋ࠅ₸․ᕈࠍࠃࠅㆊᄢ⹏ଔ ߔࠆߚ߼ㅍା OFF ߩഀว߇㜞ߊߥࠅ㧘ߘߩ⚿ᨐ㧘 ᐔဋࠬ࡞࡯ࡊ࠶࠻ߪૐਅߔࠆߚ߼ߢ޽ࠆ㧚

એ਄ߩ⚿ᨐ߆ࠄ㧘╓ภൻߦࠃࠆㆡᔕવㅍ೙ᓮᓟߩ ㅢାຠ⾰߇ᄢ߈ߊᄌൻߒߥ޿▸࿐ߢ㧘ࠬ࡞࡯ࡊ࠶࠻

߇ᦨᄢߣߥࠆ߽ߩࠍㆬᛯߔࠆߣ㧘ᡆૃࡆ࠶࠻⺋ࠅߩ

᷹ቯߩߚ߼ߩᄙ㊀ᢙߩ⸳ቯߪ16ߣߥࠆ㧚ߎߩ႐ว ߩ╙ 2 ࿕᦭ࡄࠬߦ߅ߌࠆᄙ㊀ᢙߩ⊒↢⏕₸ࠍห࿑

(c)ߦ␜ߔ㧚⇼ૃ⺋ࠅ₸ߩ᷹ቯߩߚ߼ߩᄙ㊀ᢙߩ⸳ቯ ࠍ 32 ߣߒߚ႐ว㧘ᐔဋ SNR:30[dB]ߦ߅ߌࠆㅍା

OFFߩഀวߪ⚂45%(Fig.10(d)ෳᾖ)ሽ࿷ߔࠆߩߦኻ ߒ㧘ᄙ㊀ᢙߩ⸳ቯࠍ16ߣߒߚ႐ว㧘ᐔဋSNR:30[dB]

ߦ߅ߌࠆㅍାOFFߩഀวߪ⚂30%߹ߢૐਅߒߡ޿

ࠆ㧚ߎߩߣ߈㧘ㅍାOFFߩഀวߪ⚂30%⒟ᐲߣߥ ࠅ㧘ࠬ࡞࡯ࡊ࠶࠻ߪᄙ㊀ᢙ32ߣᲧセߒᦨᄢ1.5Mbps ᡷༀߔࠆߎߣ߇น⢻ߢ޽ࠆ㧚ߘߩߚ߼㧘ᧄ⎇ⓥߦ߅

ߌࠆMIMO-MC-CDMAᣇᑼߦ߅޿ߡ㧘૏⋧࿁ォࠍ

↪޿ߚᡆૃࡆ࠶࠻⺋ࠅ₸ផቯᴺࠍ↪޿ߚㅢାຠ⾰

ផቯᴺߢߪ㧘ㅢାຠ⾰ࠍផቯߔࠆᄙ㊀ᢙߪ16߇ᦨ ㆡߢ޽ࠆߎߣ߇ࠊ߆ࠆ㧚

߹ߣ߼

ᧄⓂߢߪ㧘MIMO-MC-CDMA ᣇᑼߦ߅ߌࠆߩᡆ

ૃࡆ࠶࠻⺋ࠅ₸ߦၮߠߊ╓ภᄙ㊀ൻߦࠃࠆㆡᔕવ ㅍ೙ᓮᣇᑼࠍឭ᩺ߒ㧘ߘߩ᦭ലᕈࠍ⸘▚ᯏࠪࡒࡘ࡟

࡯࡚ࠪࡦߦࠃࠅᬌ⸛ߒߚ㧚

ࠪࡒࡘ࡟࡯࡚ࠪࡦߩ⚿ᨐ㧘ᡆૃࡆ࠶࠻⺋ࠅ₸ࠍ↪

޿ߚឭ᩺ᣇᑼࠍ↪޿ࠆߎߣߢㅢାຠ⾰ߩᡷༀ߇น

⢻ߥߎߣ߇ࠊ߆ߞߚ㧚⇼ૃࡆ࠶࠻⺋ࠅ₸ߩ᷹ቯߩߚ

߼ߩᄙ㊀ᢙߩ⸳ቯࠍᦨᄢᄙ㊀ᢙ32ߣ࿕ቯߒߚ႐ว㧘 ㆃᑧDURߦଐሽߔࠆߎߣߥߊ╓ภᄙ㊀ᢙߩㆡᔕ೙

ᓮ߇น⢻ߥߎߣ㧘ㆃᑧᵄߩᓇ㗀߇ዊߐߊߥࠆߦᓥ޿

ࠬ࡞࡯ࡊ࠶࠻ߩะ਄߇น⢻ߥߎߣ߇ಽ߆ߞߚ㧚ߒ߆ ߒ㧘ᄙ㊀ᢙࠍ32ߣ࿕ቯߒߚ႐ว㧘๟ᵄᢙㆬᛯᕈࡈ ࠚ࡯ࠫࡦࠣⅣႺਅߢߪ㧘⌀ߩࡆ࠶࠻⺋ࠅ₸ࠍㆊᄢ⹏

ଔߔࠆߚ߼㧘ㅍାOFFߩഀว߇⚂45%⒟ᐲ⊒↢ߒ㧘 ᐔဋࠬ࡞࡯ࡊ࠶࠻߇ૐਅߔࠆߎߣ߇ࠊ߆ߞߚ㧚߹ߚ㧘 ㅢାຠ⾰ߩ⛽ᜬߣࠬ࡞࡯ࡊ࠶࠻ߩะ਄ߣࠍਔ┙ߐ ߖࠆᄙ㊀ᢙࠍᬌ⸛ߒߚ⚿ᨐ㧘ᄙ㊀ᢙߪ16߇⦟޿ߎ ߣ߇ಽ߆ߞߚ㧚

੹ᓟߩ⺖㗴ߣߒߡߪ㧘ㅍା OFF ߩഀวࠍᷫዋߐ ߖࠆᛛⴚߩឭ᩺߅ࠃ߮ࠬ࡞࡯ࡊ࠶࠻ߩߐࠄߥࠆะ

਄ࠍ⠨ᘦߒㆡᔕᄌ⺞߽฽߼ߚᬌ⸛ࠍⴕ߁ᔅⷐ߇޽

ࠆ㧚߹ߚ㧘ᖱႎࡈࠖ࡯࠼ࡃ࠶ࠢࠍⴕ߁ߎߣߢߐࠄߦ ല₸ࠃߊવㅍߢ߈ࠆߣ⠨߃ࠄࠇࠆ㧚

ෳ⠨ᢥ₂

1) ໊ᴛᅢ↵, "MIMO વ៝࠴ࡖࡀ࡞ࡕ࠺࡝ࡦࠣ," ାቇ

⺰(B), Vol.J86-B, No.9, pp.1706-1720 (2003).

2) ᄢ㏹ᱞ㓶, ⷏᧛ኼᒾ, ዊᎹᕶቁ, "MIMO࠴ࡖࡀ࡞ߦ ߅ߌࠆⓨ㑆ಽഀᄙ㊀ᣇᑼߣߘߩၮᧄ․ᕈ," ାቇ⺰

(B), Vol.J87-B No.9, pp.1162-1173 (2004).

3) ᔒ᧛㓉৻㇢, ᄢ㊁ജ, ␹ᨋ෹๺, ╣ἑᎯ, "࠴ࡖࡀ࡞

ⴕ೉ߩ⋧㑐ⴕ೉ߩᦨዊ࿕᦭୯ࠍᄢ߈ߊߔࠆࠃ߁ߦ ㅍା૏⋧೙ᓮࠍⴕ߁E-SDM/OFDMࠪࠬ࠹ࡓ," ାቇ ᛛႎ, RCS2004-44, pp.115-120 (2004).

4) S. Hara and R. Prasad, "Overview of multicarrier CDMA," IEEE Communications Magazine, Vol.35, No.12, pp.126-133 (1997).

5) ᧻ᧄᷤ, ⪭ว⑲᮸, "OFDMᄌ⺞ᣇᑼߩᔕ↪," ࠻࡝ࠤ

࠶ࡊࠬ (2001).

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6) ศ↰᥍ੱ, ೨ේᢥ᣿, 㜞⇌ᢥ㓶, "OFDMવㅍߦ߅ߌ ࠆ㜞ㅦࡈࠚ࡯ࠫࡦࠣᄌേ⵬ఘߦ㑐ߔࠆ৻ᬌ⸛," ା ቇᛛႎ, AP2001-119, pp.47-52 (2001).

7) E. A. Newcombe and S. Pasupathy, "Error rate monitoring for digital communication," Proceedings of IEEE, Vol.70, No.8, pp.805-828 (1982).

8) I. M. Kosic, "Pseudo error rate of a PSK system with hardware imperfections, noise and cochannel interference," IEE Proceedings, Vol.136, Pt.I, No.5, pp.333-338 (1989).

9) ဈᧄ೰ᙗ, ቟୚స᣿, "DSRCࠪࠬ࠹ࡓߦ߅ߌࠆᡆૃ

⺋ࠅᬌ಴ᴺࠍ↪޿ߚㆡᔕᄌ⺞ߩᕈ⢻⹏ଔ," ାቇ✚

ᄢ, A-17-6 (2003).

10) ጤ੗⺈ੱ, ᷰㆻ⾆ᔒ, 㜞੗ାੱ, ╣ጟ⑲৻, "ᡆૃࡆ

࠶࠻⺋ࠅߦၮߠߊࡆ࠶࠻⺋ࠅ₸ߩផቯᴺ," ାቇᛛ ႎ, AP2006-15, pp.35-40 (2006).

11) ᷰㆻ⾆ᔒ, ጤ੗⺈ੱ, ╣ጟ⑲৻, "ᡆૃ⺋ࠅߦࠃࠆ࿁

✢ຠ⾰ផቯᴺࠍ↪޿ߚOFDMㆡᔕᄌ⺞ᣇᑼ," หᔒ

␠ᄢቇℂᎿቇ⎇ⓥႎ๔, 47, 149-159(2006).