ECMA UWB Background
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Transcript of ECMA UWB Background
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Ecma/GA/2005/038
High Rate - Ultra Wide Band (UWB)Background
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Promise of a UWB PhysicalLayer
Data rates: Scalable data rates from 55 Mb/s to 480 Mb/s.
110 Mb/s at 10 meters in realistic multi-path environments. 200 Mb/s at greater than 4 meters in realistic multi-path environments. 480 Mb/s at 2 meters in realistic multi-path environments.
Low cost solutions.
Low power PHY solutions:
Integrated CMOS solution Single chip solutions Small formfactors.
Coexistence with current and future devices.
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Overview of Multi-band OFDM
Central Idea #1: Divide the spectrum into bands that are 528 MHz wide.
Advantages: Transmitter and receiver process smaller bandwidth signals. Instantaneous processing BW = 528 MHz.
f 3432MHz3960MHz
4488MHz
5016MHz
5544MHz
6072MHz
6600MHz
7128MHz
7656MHz
8184MHz
8712MHz
9240MHz
9768MHz
Band#1
Band#2
Band#3
Band#4
Band#5
Band#6
Band#7
Band#8
Band#9
Band#10
Band#11
Band#12
Band#13
10296MHz
Band#14
Band Group #1 Band Group #2 Band Group #3 Band Group #4 Band Group #5
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Exploiting the Band Plan
Exploit range of band groups to separate applications:
Longer Range Apps
Use BG #1 and #2
f 3432MHz3960MHz
4488MHz
5016MHz
5544MHz
6072MHz
Band#1
Band#2
Band#3
Band#4
Band#5
Band#6
Band Group #1 Band Group #2
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Exploiting the Band Plan
Exploit range of band groups to separate applications:
f 3432MHz3960MHz
4488MHz
5016MHz
5544MHz
6072MHz
6600MHz
7128MHz
7656MHz
8184MHz
8712MHz
9240MHz
9768MHz
Band#7
Band#8
Band#9
Band#10
Band#11
Band#12
10296MHz
Band Group #3 Band Group #4
` Shorter Range Apps
Use BG #3 and #4
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Overview of Multi-band OFDM
Central Idea #2: Interleave OFDM symbols across all bands.
Advantages: Exploits frequency diversity. Provide robustness against multi-path / interference. Same transmit power as if the entire band is used.
TimeFreq (MHz)
3168
3696
4752
4224
Band # 1
Band # 2
Band # 3
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Transmitter Architecture
Block Diagram:
Architecture is similar to that of a conventional/proven OFDM system.
Major Differences:
1. Time-Frequency kernel specifies the frequency for next OFDM symbol.
2. Constellation size is limited to QPSK (limits size of IFFT/FFT, DAC/ADC).3. For rates less than 80 Mb/s, the input to the IFFT is conjugate symmetric.
Need to only implement the I portion of TX analog chain. As a result, only half the analog die size of a full I/Q transmitter is needed.
4. Zero-padded prefix instead of cyclic prefix.
Scrambler InputData FEC Interleaver Mapper IFFT DAC
exp( j 2 f c t )
Time-FrequencyKernel
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Conclusions
Inherent robustness to multi-path in all expected environments.
Excellent robustness to U-NII and other generic narrowband interference.
Ability to comply with worldwide regulations: Channels and tones can be turned on/off dynamically to comply with changing
regulations. Can arbitrarily shape spectrum because the tones resolution is ~4 MHz.
Example: Radio-astronomy bands in Japan. Only need to zero out a few tones in order to protect these services.
Channel #1 Typical OFDM waveform Channel #1 Waveform with Japaneseradioastronomical bands protected.
3260 -3267 MHz3332-3339 MHz3345.8 -3352.5 MHz
-f
-f
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Rue du Rhne 114CH-1204 GenevaT: +41 22 849 6000F: +41 22 849 6001
www.ecma-international.org
