IEEE 802'15 subject

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Project IEEE P802.15 Working Group for Wireless
Personal Area Networks (WPANs) Submission Title
Low-Cost Millimeter-Wave Self-Heterodyne
Technique and Its Application Date Submitted
November 11, 2003 Source Yozo Shoji, Kiyoshi
Hamaguchi, and Hiroyo Ogawa Company
Communications Research Laboratory, Incorporated
Administrative Agency Address 3-4,
Hikarino-Oka, Yokosuka, Kanagawa, 234-0051,
Japan Voice81.46.847.5075, FAX
81.46.847.5079, E-Mail y-shoji_at_crl.go.jp
Abstract Description of new technology to
reduce the creation cost of millimeter-wave
systems. Purpose Contribution to mmWIG at
November 2003 meeting Notice This document has
been prepared to assist the IEEE P802.15. It is
offered as a basis for discussion and is not
binding on the contributing individual(s) or
organization(s). The material in this document is
subject to change in form and content after
further study. The contributor(s) reserve(s) the
right to add, amend or withdraw material
contained herein. Release The contributor
acknowledges and accepts that this contribution
becomes the property of IEEE and may be made
publicly available by P802.15.
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Low-Cost Millimeter-Wave Self-Heterodyne
Technique and Its Application
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Main Issues for Millimeter-Wave Systems
Development

• Creation of small inexpensive millimeter-wave
  devices
• Creation of stable millimeter-wave oscillator to
  achieve frequency stability of signal
  transmission
• Conventional solution
• Use of phase-locked-loop oscillator configuration
• Use of primitive modulation format such as ASK
  (Amplitude-shift-keying) or FSK
  (Frequency-shift-keying)
• Overcoming the problems of the necessity for Line
  of Sight (LoS) paths

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Our cost-effective solution for each Issue

• Creation of small inexpensive millimeter-wave
  devices
• Creation of stable millimeter-wave oscillator to
  achieve frequency stability of signal
  transmission
• Overcoming the problems of the necessity for LoS
  paths

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Principle of Millimeter-Wave Self-Heterodyne
Technique

• Transmission of Local Oscillator (LO) along with
  RF modulation signals and down-conversion of
  received RF signals by square-law detection
• Frequency offset and phase noise are completely
  cancelled out
• Low-cost LO is available at Tx. and no LO is
  required at Rx.

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Demonstration system Transmitter and receiver
developed for video signal transmission system
Local-oscillator, mixer, amplifiers, BPF, and
antenna included
Square-law detector, amplifiers, and BPF included
110 mm
62 mm
Receiver
Transmitter (face and back)
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Phase noise Cancellation Effect
1. IF input signal/carrier characteristics
2. IF output signal/carrier characteristics
Comparison of phase-noise power
No phase noise degradation after mmW transmission
!!
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An Example Simple mmW Application- mmW Video
Transmission System -

• Re-broadcasting of all the video channels
• Point-to-Multipoint (P-MP) system structure with
  a broad-beam transmitter

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A Problem and Solution to the Interception by
Blockage of LoS path

• Millimeter-wave link requires LoS path
• Signal interception by Blockage of Line-of-Sight
  path

• Installing two millimeter-wave receivers (antenna
  diversity reception)
• Reduced probability that the communication link
  is disconnected

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Combining Antenna Diversity based on
Millimeter-Wave Self-Heterodyne Technique
IF out1
MMW
Modulator
Self-Heterodyne Receiver 1
Power Combiner
Demodulator
Transmitter for Self-Heterodyne
IF out2
Self-Heterodyne Receiver 2

• Easy in-phase signal combining by using
  self-heterodyne technique (Up/Down-conversion
  process never affects frequency of IF output from
  each receiver)

Using several self-heterodyning receivers enables
combining diversity reception in a simple and
low-cost manner
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Conclusion

• Millimeter-wave Self-heterodyne technique is
  introduced
• Self-heterodyne technique is a key technology for
  reducing the mmW system cost and for solving the
  problem of blockage of LoS path
• Millimeter-wave Self-heterodyne technique is a
  promising PHY for mmW system