IEEE-SA - Working Group



IEEE P802.15

Wireless Personal Area Networks

|Project |IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) |

|Title | |

|Date Submitted |[14 July, 2003] |

|Source |[Reed Fisher] |Voice: [1-770-271-0529] |

| |[Oki Electric Industry Co., Ltd.] |E-mail: [reedfisher@ ] |

| |[2514 E. Maddox Rd., Buford, GA 30519 USA.] | |

| | | |

| |[Hiroyo Ogawa] | |

| |[Communication Research Laboratory |Voice:[81-46-847-5070] |

| |Independent Administrative Institution |FAX[81-46-847-5079] |

| |] |E-Mail:[hogawa@crl.go,jp] |

| |[3-4 Hikarino-oka, Yokosuka, Kana-gawa, 239-09847 Japan.] | |

|Re: |[CFP presentation] |

|Abstract |[Millmeter-wave ad-hoc wireless system for the alternate PHY to IEEE802.15.3 MAC&PHY Standard for Alt PHY] |

|Purpose |[Proposal for the alternate PHY to IEEE802.15.3 MAC&PHY Standard] |

|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. |

Millimeter-Wave Ad-hoc Wireless System

1. System Features

• Utilization of unlicensed millimeter-wave band

- Restricted small and line of sight area but high speed data rate (～624Mbps)

- High coexistence with the existing microwave band wireless system

• Countermeasure in use of millimeter-wave band

Complete cancellation of phase noise and frequency-offset by self-heterodyne transmi-ssion and detection technique

2. Application Images

• Basic Ad-hoc system based on 802.15.3a applications

PNC organizes the communications among DEVs in the piconet .

Figure 2.1. Basic Ad-hoc system

• Ad-hoc information distribution system

The ad-hoc coverage area extension using P-P millimeter-wave link

Figure 2.2. Ad-hoc information distribution system

3. Base Band (BB) & IF processing

• Basic transmission rate is 156Mbps using DQPSK

• Configuration Schemes

Multi-channel structure

Transmission rate per channel is 156Mbps.

-Frequency division multiplex using low speed modulators (25Mbps)

-Number of channels is 4

-Transmission rate per channel is 25Mbps

(Total transmission rate is 624Mbps)

-Simultaneous transmission of divided frame

[pic]

Figure 3.1. Block diagram of Base band and IF processing

4. RF processing

• Transmission

Single RF carrier is used.

Available Transmission method:

-With Single Side band (SSB) : Basic proposal

-With Double Side band (DSB): Optional proposal

-Without Side band : Optional proposal

• Reception for Side band transmission

Complete cancellation of phase-noise and frequency -offset by the self –heterodyne detection (square-law detection)

[pic]

Figure 4.1. Block diagram of RF processing

5. PHY Frame Format

5.1. Single Channel Transmission

Figure 5.1.1. PHY frame format: Single Channel Structure

5.2. Multi-channel Structure

Figure 5.2.1. PHY frame format: Multi-channel Structure

6. Interference and Susceptibility

Interference coming from the other standard systems is negligibly small.

The interference attenuation by spurious strength and filter is expected between Millimeter-

wave band (802.15.3a) and Micro-wave band (other standard systems).

-Calculation for interference from other standard system

Table 6.1. Interference coming from the other standard systems

7. Coexistence

The interference impacted to microwave band systems, from this proposed systems, is

sufficiently smaller than the Rx sensitivity of the microwave sys-tem.

Therefore, coexistence is assured.

-Calculation of interference impacted to other standard system from this proposal system

Table 7.1. Interference impacted to the other standard systems

8. Payload Bit Rate and Data Throughput

8.1 Single channel

[pic]

Figure 8.1.1. Time length of PHY frame

Therefore, the Data Throughputs for Payload Bit Rates are given as following table.

Table 8.1.1. Data Throughput for each payload bit rate

[pic]

8.2 Multi channel

[pic]

Figure 8.2.1. Time length of PHY frame

Therefore, the Data Throughputs for Payload Bit Rates are given as following table.

Table 8.2.1. Data Throughput for each payload bit rate

[pic]

9. Simultaneously Operating Piconets

9.1 156Mbps (AWGN)

- Co-channel separation distance (dint) is about 44.6 m, from the following calculation.

- Each parameter is referred to link budget.

- Calculation is as follows.

- Tx antenna gain = Rx antenna gain = 20 dBi

[pic]

Figure 9.1.1. Co-channel interference level

9.2 624Mbps (AWGN)

- Co-channel separation distance (dint) is about 11.2 m, from the following calculation.

- Each parameter is referred to link budget.

- Calculation is as follows.

- Tx antenna gain = Rx antenna gain = 20 dBi

[pic]

Figure 9.2.1. Co-channel interference level

9.3 156Mbps (Channel model)

The Narrow band channel model (Raleigh channel model )is used as the channel model according to P802.15-02/490r1 which describes the channel model for the proposals using a narrow band channel in the 2.4 GHz,5GHz, 60GHz, or other unlicensed spectrum

- Co-channel separation distance (dint) is about 44.6 m, from the following calculation.

- Each parameter is referred to link budget.

- Calculation is as follows.

- Tx antenna gain = Rx antenna gain = 20 dBi

[pic]

Figure 9.3.1. Co-channel interference level

9.4 624Mbps (Channel model)

- Co-channel separation distance (dint) is about 11.2 m, from the following calculation.

- Each parameter is referred to link budget.

- Calculation is as follows.

- Tx antenna gain = Rx antenna gain = 20 dBi

[pic]

Figure 9.4.1. Co-channel interference level

10. Signal Acquisition

10.1 Miss detect probability of AWGN channel

- Miss detect probability (Pmd) is probability which causes bit error more than 2 bits.

- 1 bit error is permitted to detect unique word.

[pic]

[pic]

Figure 10.1.1. PER vs. Eb/No Characteristics

10.2 False alarm probability of AWGN channel

- False alarm probability (Pfa) is probability which detects unique word after PHY Header.

- Pfa = 9.91 x 10-3 (at 156 Mbps), 3.91 x 10-2 (at 624 Mbps)

- Calculation of Pfa is as follows

Pfa_1ch = 0.520 x 10395= 9.91 x 10-3

20 = unique word length

10395 = (length from PHY Header to FCS with including FEC per 1ch)

Pfa = 1 - (1 - Pfa_1th ch) (1 - Pfa_2nd ch) (1 - Pfa_3rd ch) (1 - Pfa_4th ch)

It is assumed that Pfa_1th ch = Pfa_2nd ch = Pfa_3rd ch= Pfa_4th ch

Pfa=1 - (1 - Pfa_1ch)4 = 1 –(1 – 9.91 x 10-3)4 = 1.02 x 10-2

4 = Number of channel

11. System Performance

11.1 Required Eb/N0 for PER 8 % in AWGN channel

- Error Correction : BCH(63,51)

- The Narrow band channel model (Raleigh channel model )is used as the channel model according to P802.15-02/490r1 which describes the channel model for the proposals using a narrow band channel in the 2.4 GHz,5GHz, 60GHz, or other unlicensed spectrum.

- Required Eb/N0 for PER 8 % as follows

[pic]

[pic]

Figure 11.1.1. PER vs. Eb/No Characteristics

11.2 PER vs. Distance characteristics of AWGN channel

- By using PER- Eb/N0 characteristics, PER-Distance characteristics are calculated.

- Parameters such as center frequency, propagation loss are referred to link budget.

- PER at d = 10 m is less than 10-5

[pic]

Figure 11.2.1. PER vs. Distance Characteristics

12. Sensitivity

Receiver Sensitivity of this system is given by following equation.

Receiver Sensitivity = Noise Power + Required Eb/N0 + Modulation Loss

+ Self-heterodyne Loss + Channel Multiplex Loss

Table 12.1. Receiver sensitivity for each transmission rate

[pic]

13. Link Budget

- Link budget is calculated for antenna gain 20 dBi case.

- Proposed min. Rx sensitivity level is as follows.

Rx sensitivity level = -60.3 dB (AWGN, 156 Mbps), -53.9 dB (AWGN, 624 Mbps),

-41.0 dB (Channel model, 156 Mbps), -33.0 (Channel model, 624 Mbps)

-From link budget, directional antenna is necessary for millimeter-wave band system.

Table 13.1. Link budget

[pic]

14. Regulatory Compliance

Table 14.1. Regulatory Compliance

[pic]

15. Scalability

1. 156 Mbps data rate is supported by single-channel.

2. When the desired rate is greater than 156 Mbps, it could be provided by changing number of channel.

3. When the desired rate is smaller than 156 Mbps, it could be provided by symbol repetition .

16 Prototype System

16.1 RF Circuits

16.2 Setup

16.3 Performance

16.3,1 Phase-Noise Performance

Almost no phase-noise performance degradation occurs by the millimeter-wave transmission

(a) Input IF signal

(b) Out put IF signal after self-heterodyne detection

16.3.2 Transmission Power Performance

Optimal condition (PLO=PUSB+PLSB) for DSB and total transmission power of 10dBm can be performed.

16.3,3 Receiver Linearity

Good linearity can be achieved for wide power range

16.4 Demonstration System

RF Unit of MT RF Unit of AP

SELF-Evaluation

General Solution Criteria

|CRITERIA |REF. |IMPORTANCE |PROPOSER RESPONSE |

| | |LEVEL | |

|Unit Manufacturing Complexity (UMC) |3.1 |B |0 |

|Signal Robustness |

|Interference And Susceptibility |3.2.2 |A |+ |

|Coexistence |3.2.3 |A |+ |

|Technical Feasibility | | | |

|Manufacturability |3.3.1 |A |+ |

|Time To Market |3.3.2 |A |0 |

| Regulatory Impact |3.3.3 |A |+ |

|Scalability (i.e. Payload Bit Rate/Data |3.4 |A |0 |

|Throughput, Channelization – physical or | | | |

|coded, Complexity, Range, Frequencies of | | | |

|Operation, Bandwidth of Operation, Power | | | |

|Consumption) | | | |

|Location Awareness |3.5 |C |- |

PHY Protocol Criteria

|CRITERIA |REF. |IMPORTANCE |PROPOSER RESPONSE |

| | |LEVEL | |

|Size And Form Factor |5.1 |B |0 |

|PHY-SAP Payload Bit Rate & Data Throughput |

|Payload Bit Rate |5.2.1 |A |+ |

|Packet Overhead |5.2.2 |A |+ |

|PHY-SAP Throughput |5.2.3 |A |+ |

|Simultaneously Operating Piconets |5.3 |A |0 |

|Signal Acquisition |5.4 |A |0 |

|System Performance |5.5 |A |+ |

|Link Budget |5.6 |A |+ |

|Sensitivity |5.7 |A |0 |

|Power Management Modes |5.8 |B |0 |

|Power Consumption |5.9 |A |0 |

|Antenna Practicality |5.10 |B |0 |

MAC Protocol Enhancement Criteria

|CRITERIA |REF. |IMPORTANCE |PROPOSER RESPONSE |

| | |LEVEL | |

|MAC Enhancements And Modifications |4.1. |C |0 |

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