Universal Edits Done Through out the Document

12/19/2007

David Case

Chair Taskgroup 700

Edits made to C 63.19 version 2a

This document only addresses edits added and does not address comments inserted into the document. Please review draft document for additional comments

Universal edits done through out the document

Changed reference of year from 2006 to 200x
Changed lower frequency from 675 MHz to 700 MHz

Specific Edits

Page 4: Last paragraph has been modified to read as follows:

Upon the approval of the ANSI C63.19-2006 version, a new issue was raised concerning a new frequency band. This band is the 700 MHz band that the FCC has now allocated for wireless services per Report and Order 06-107. As part of that rulemaking the Commission has tasked the C63 committee with addressing the HAC requirements for the 700 MHz band. The working group and ANSI ASC C63™ decided to open an amendment project to deal with these issues. The successful completion of that effort resulted in the publication of this version of the standard, ANSI C63.19-200x.

Page 6 under references added

Code of Federal Regulations Title 47 Part 27 (47CFR27) Miscellaneous Wireless Communication Services

Modified Table 4.2 on page 19 as shown below. A discussion on the test antennas need to take place for the antennas above 2 GHz .

In part we have new bands including

AWS 2310 –

802.11b/g/n 2400-2483.5MHz

802.11y 3650-3700 MHz

Public safety 4940- 4990 MHz

802.11a./n 5150-5350MHz

5470-5725MHz 5725-5850MHx

5470-5725MHzTable 4.2—Illustrative dipole calculated and measured values a[d1]

Dipole
(see
Annex D) / Baseband
frequencies
(MHz) / Frequency
(MHz) / E-field
calculated
values
(V/m) / E-field
measured
values
(V/m) / E-field
delta
(calculated
to
measured)
(V/m) & % / H-field
calculated
values (A/m) / H-field
measured
values
(A/m) / H-field
delta
(calculated
to
measured
A/m & %)
D.5.1 thick / 698-746 / 722
D5.1 thick / 746-792 / 769
D.5.1 thick / 790–850 / 835 / 187 / 0.476
D.5.1 thick / 806–821 / 813.5 / 190 / 0.481
D.5.1 thick / 896–901 / 898.5 / 185 / 0.477
D.5.1 thick / 1880–2000 / 1880 / 149 / 0.456
D.5.1 thick / 2310-2360 / 2315
D.5.1 thick / 2400-2483.5 / 2442
D.5.1 thick / 2500-2689 / TBD
D.5.1 thick / 3650-3700 / TBD
D.5.1 thick / 4940-4990 / 4963.5 (3)
D.5.1 thick / 5150-5250 / 5220
D.5.1 thick / 5250-5350 / 5320
D.5.1 thick / 5470-5725 / 5600
D.5.1 thick / 5725-5850 / 5785
D.5.1 planar / 722
D 5.1 planar / 769
D.5.1 planar / 813.5 / 224.6–236.4 / 0.5139–0.5226
D.5.1 planar / 835 / 214.9–232.2 / 0.4954–0.5164
D.5.1 planar / 898.5 / 213.2–220.9 / 0.5032–0.5005
D.5.1 planar / 1880 / 153.6–149.3 / 0.4478–0.4035
D.5.1 planar / 2310-2360 / 2315
D 5.1 planar / 2400-2483.5 / 2442
D.5.1 planar / 2500-2689 / TBD
D.5.1 planar / 3650-3700 / TBD
D.5.1 planar / 4940-4990 / 4963.5 (3)
D.5.1 planar / 5150-5250 / 5220
D.5.1 planar / 5250-5350 / 5320
D.5.1 planar / 5470-5725 / 5600
D.5.1 planar / 5725-5850 / 5785

Added Note 3 to table 4.2

NOTE 1—Numeric modeling results will vary based on several factors, including the size of the computational area, boundary conditions selected, grid resolution, accuracy of models for material properties, and other factors. Further, the results obtained by numeric modeling will vary from measured results based on many additional factors, including the degree to while the probe perturbs the field, the degree to which the probe averages the field strength over its dimensions, the linearity of the probe, the differences between the physical dipole and its modeled representation, and many other factors. Numeric computations provided to the committee showed significant variability between different results. Accordingly the values provided should be used judiciously and not interpreted to be absolutely correct. The calculated values provided for dipoles were developed using theoretical numerical computation.
NOTE 2—Delta % = 100 × (measured peak minus calculated) divided by calculated. Values within ± 25% are acceptable, of which 12% is deviation and 13% is measurement uncertainty. Values independently validated for the dipole actually used in the measurements should be used, when available.
NOTE 3—Based on 5MHz wide channel – 10, 15, 20 MHz may have some offset. 1MHz channel at 4943.5 also should be evaluated

aThe peak field mentioned in this table is sinusoidal peak. The values cannot be directly compared to the “desired quantity.”

5) Under section 5,1 Test Equipment modified the part on 2 dipoles and added 4 dipoles to cover the entire frequency range

1)4 resonant dipoles designed to radiate between 698 MHz and 950 MHz , one between 1.6 GHz and 3 GHz, one between 3GHz to 4.5GHz, and the last between 4.5GHz to 6GHz

4) Added comments to section 4.3.2.1.3 on dipole antennas – we need to address the issue of dipoles in this entire section

5) Added comment to section 5.2 on test signals we need to determine what test signal to use above 3GHz

6) Added tests for dipoles above 3Ghz to section 5.3

7) Added extended range to section 5.3 (10) under procedure

8) Added comment to 6.3.2.1 page 62 on addressing modulations - we need to discuss modulations for both 700 MHz as well as above 3GHz. Above 3GHz most will be some type of OFDM based modulations

9) Section 7.1 weighting factors – this is an open issue for 700 MHz and 3 to 6GHz.

Amended table B-2 on page 70 as follow – additional modifications may be needed

Test frequencies and associated channels
Channel
(at or near) / Frequency
(MHz)
Cellular 850
334 (CDMA) / 835
334 (TDMA) / 835
UARFCN 4175 (UMTS) / 835
189 (GSM) / 836
PCS 1900
660 (GSM) / 1880
600 (CDMA) / 1880
1001 (TDMA) / 1880
UARFCN 9400 (UMTS) / 1880
SMR 800
370 (iDEN) / 813.5
SMR 900
281 (iDEN) / 898.5
700 MHz
TBD / 722
2300 AWS
TBD / 2315
2400 802.11
TBD / 2442
2500 BWS
TBD / TBD
3650
TBD / TBD
4940
TBD / 4963.5
5150
TBD / 5220
5250
TBD / 5320
5470
TBD / 5600
5800
TBD / 5785

aFrequencies and channels in this table are based on FCC part 22 for cellular; FCC part 24 for PCS; and FCC part 90 for SMR (47 CFR 22, 47 CFR 24, CFR 27 and 47 CFR 90), FCC Part 15 .

Changes to table C1 on page 75

E-field calibrated value:
(49.54 dB V/m) / H-field calibrated value:
(0 dB A/m)
Frequency
(MHz) / Net power
(dBm) / Frequency
(MHz) / Net power
(dBm)
675 / 675
676.5 / 676.5
678 / 678
679.5 / 679.5
681 / 681
682.5 / 682.5
684 / 684
— / —
— / —
— / —
950 / 950

Need to review section

D.5.1.1 Dipoles for 675 MHz to 950 MHz

For the band from 675 MHz to 950 MHz, a thick dipole (RG-402U, 3.58 mm diameter) cut for resonance between approximately 880 MHz and 900[d2]MHz[d3] has a worst-case VSWR ≈ 1.6 in a 50 Ω system (PR ≤ 5.3%) without any matching section, i.e., only a balun. This is because the fractional bandwidth is relatively small. The resonant length for this dipole is 161.2 mm or approximately 161 mm. This causes the dipole to resonate at ≈ 890 MHz.

D.5.1.2 Dipoles for 1.6 to 3Ghz, 3 to 4.5GHz, and 4.5 to 6GHz

Dipoles for 1.6 GHz to 3 GHz, 3 to 4.5GHz, and 4.5 to 6GHz

WD bands range from 1.6 GHz to 6 GHz. This expanded frequency range can be covered by 3 dipoles, as described in this subclause[d4]. Because of the extended frequency range at least 3 dipoles will be needed[d5]

Additional changes to section D include changing the lower frequency to 698MHz and the upper band to 6GHz

Overall it appears that Annex D will need to be modified completely to address the 700 MHz band as well as the 3 to 6GHz band.

Additional work in section E as well on the test antennas will be needed

Will need to address the modulations in Annex G, most of the modulations above 3GHz will be OFDM based technology with bandwidths from 1 MHz to as high as 40MHz for 802.11n

I added a very basic description of it

A.1OFDM

Orthogonal Frequency-Division Multiplexing (OFDM) — essentially identical to Coded OFDM (COFDM) — is a digital multi-carrier modulation scheme, which uses a large number of closely-spaced orthogonalsub-carriers. Each sub-carrier is modulated with a conventional modulation scheme (such as quadrature amplitude modulation) at a low symbol rate, maintaining data rates similar to conventional single-carrier modulation schemes in the same bandwidth. In practice, OFDM signals are generated and detected using the Fast Fourier transform algorithm.

OFDM has developed into a popular scheme for widebanddigital communication, wireless as well as over copper wires.

The primary advantage of OFDM over single-carrier schemes is its ability to cope with severe channel conditions — for example, attenuation of high frequencies in a long copper wire, narrowband interference and frequency-selective fading due to multipath — without complex equalization filters. Channel equalization is simplified because OFDM may be viewed as using many slowly-modulated narrowband signals rather than one rapidly-modulated wideband signal. Low symbol rate makes the use of a guard interval between symbols affordable, making it possible to handle time-spreading and eliminate inter-symbol interference (ISI).

A.1.1Orthogonality

In OFDM, the sub-carrier frequencies are chosen so that the sub-carriers are orthogonal to each other, meaning that cross-talk between the sub-channels is eliminated and inter-carrier guard bands are not required. This greatly simplifies the design of both the transmitter and the receiver; unlike conventional FDM, a separate filter for each sub-channel is not required.

The orthogonality also allows high spectral efficiency, near the Nyquist rate. Almost the whole available frequency band can be utilized. OFDM generally has a nearly 'white' spectrum, giving it benign electromagnetic interference properties with respect to other co-channel users.

The orthogonality allows for efficient modulator and demodulator implementation using the FFT algorithm. Although the principles and some of the benefits have been known since the 1960s, OFDM is popular for wideband communications today by way of low-cost digital signal processing components that can efficiently calculate the FFT.

OFDM requires very accurate frequency synchronization between the receiver and the transmitter; with frequency deviation, the sub-carriers shall no longer be orthogonal, causing inter-carrier interference (ICI), i.e. cross-talk between the sub-carriers. Frequency offsets are typically caused by mismatched transmitter and receiver oscillators, or by Doppler shift due to movement. Whilst Doppler shift alone may be compensated for by the receiver, the situation is worsened when combined with multipath, as reflections will appear at various frequency offsets, which is much harder to correct. This effect typically worsens as speed increases, and is an important factor limiting the use of OFDM in high-speed vehicles. Several techniques for ICI suppression are suggested, but they may increase the receiver complexity

Section I, we may want to include measurement of broadband signals where the BW is greater then 5MHz

[d1]Will need to calculate the E-field and H-field values for this chart for 700 Mhz as well as 3 to 6GHz range

[d2]We need to determine if this is correct based on the frequency change – suggest change to say 820-850 Mhz

[d3]Need to change

[d4]Need to modify subclause

[d5]Additional discussion needs to be done on this subject as part of addressing this section