Information Technology Information Technology Centre Centre Centre Europe Europe Europe Information Technology Information Technology Centre Europe Telecommunications Laboratory Telecommunications Laboratory Telecommunications Laboratory Telecommunications Laboratory UWB Non-Coher UWB Non- Coherent High Data ent High Data UWB Non-Coher UWB Non- Coherent High Data ent High Data Rates Transceiver Rates Transceiver Rates Transceiver Rates Transceiver Architecture and Implementation Architecture and Implementation Architecture and Implementation Architecture and Implementation RF studies: J. B. Doré, S. Mallégol Signal processing: S. Paquelet, L. M. Aubert, B. Uguen (mallegol@tcl.ite.mee.com)
General Purpose General Purpose General Purpose General Purpose "How to transmit hundreds of megabit with impulse radio?" "How to transmit hundreds of megabit with impulse radio?" � Principles Principles � • Impulse radio based solution duplicated on multiple sub-bands • Asynchronous treatments � energetic detector instead of correlations � Performance study Performance study � • 600 Mbit/s @ 3 meters, 150 Mbit/s @ 10 meters • matches IEEE 802.15.3a requirements � Implementation sketches Implementation sketches � • Use existing analog devices Mitsubishi Electric Proprietary - IWCT’05 – June 2005 - Slide 1
Presentation progress Presentation progress Presentation progress Presentation progress Outline Outline � Principles and performances Principles and performances � � Transceiver architecture Transceiver architecture � � Transceiver implementation Transceiver implementation � � Conclusion and prospects Conclusion and prospects � Mitsubishi Electric Proprietary - IWCT’05 – June 2005 - Slide 2
Presentation progress Presentation progress Presentation progress Presentation progress Outline Outline � Principles and performances Principles and performances � � Transceiver architecture Transceiver architecture � � Transceiver implementation Transceiver implementation � � Conclusion and prospects Conclusion and prospects � Mitsubishi Electric Proprietary - IWCT’05 – June 2005 - Slide 3
Principles (I) Principles (I) Principles (I) Principles (I) S. Paquelet Paquelet et al., et al., UWBST&IWUWBS 2004 S. � A traditional approach A traditional approach � – Coherent - RAKE receiver, BUT: • Antenna and channel distortion � unpredictable received waveform. – For example: For example: – TX waveform RX waveform – Which matched signal has to be used in the correlators? – Which matched signal has to be used in the correlators? • Multi-paths channel � received signal spreads on tens of nanoseconds. – For example: For example: – Td About 60 paths needed to capture 85% of the energy 0 100 200 t(ns) – How can a RAKE receiver, built on a limited number of fingers, benefit from How can a RAKE receiver, built on a limited number of fingers, benefit from – the available energy? the available energy? Mitsubishi Electric Proprietary - IWCT’05 – June 2005 - Slide 4
Principles (II) Principles (II) Principles (II) Principles (II) S. Paquelet Paquelet et al., et al., UWBST&IWUWBS 2004 S. � Adopted approach: Adopted approach: � • Asynchronous receiver: energy detection � available energy captured • On-Off Keying modulation Td 1 Τ ∫ i ( )² Channel 0 0 1 1 0 1 Ti Tr T r > T d � to avoid inter symbol interference T i evaluated from channel estimation (synchronization procedure) • Extension to multiple bands � achieve channel capacity � Decision problem: Decision problem: � ⎧ ∫ T = i 2 H : x [ ( )] n t dt Minimize error probability with known B ⎪ 0 = ∫ 0 ⎨ T i 2 and estimated T , E s t dt ( ) , N / 2 T ∫ ⎪ = + i 2 i H : x [ ( ) s t n t ( )] dt ⎩ 0 1 0 Optimal = ρ ⎧ L E N / L ( ) ~ + + − φ ⎨ opt threshold with M M 1. L = ⎩ M BT N 4 i setting Mitsubishi Electric Proprietary - IWCT’05 – June 2005 - Slide 5
Performances Performances Performances Performances S. Paquelet Paquelet et al., et al., UWBST&IWUWBS 2004 S. � Error probability: Error probability: � Coherent - RAKE receiver: � Energy recovered on few paths M = BT i Quadratic integration: � Whole available energy recovered Ideal rake receiver achieves comparable P e if Pe it collects 33% to 40% of the whole available 10 -5 energy . Now, according to: - Power emission limits, - Channel propagation, - Demodulation schemes, � Where is the working point? E/N (dB) � Link budget example: Link budget example: � R * 1 5 0 2 4 0 6 0 0 M b it/s d 1 0 5 3 m CM: IEEE Channel Model B 5 0 0 5 0 0 2 5 0 M H z - 2: NLos 0-4 meters N b a n d 1 2 1 2 2 4 - 3: NLos 4-10 meters T r 8 0 5 0 4 0 n s * without FEC code - 4: extreme NLos multipath C M 4 3 2 T i 5 0 4 0 3 0 n s 1 0 -5 1 0 -5 1 0 -5 P e * Mitsubishi Electric Proprietary - IWCT’05 – June 2005 - Slide 6
Presentation progress Presentation progress Presentation progress Presentation progress Outline Outline � Principles and performances Principles and performances � � Transceiver architecture Transceiver architecture � � Transceiver implementation Transceiver implementation � � Conclusion and prospects Conclusion and prospects � Mitsubishi Electric Proprietary - IWCT’05 – June 2005 - Slide 7
Proposed architectures Proposed architectures Proposed architectures Proposed architectures � Tx Tx architecture: implementation using filter bank architecture: implementation using filter bank � Digital data B 1 Typical figures: B 2 N between 15 and 30 Energy Σ Pulse B i between 250 and 500 MHz splitter generation PRF lower than 30 MHz PRF ( Pulse Repetition Frequency ) B N Filter Bank � Rx architecture: quadratic detector on each sub-band Rx architecture: quadratic detector on each sub-band � Synchronization Typical figures: between 15 and 30 N Τ ∫ i ( )² B 1 ADC B i between 250 and 500 MHz 0 T i between 20 and 100 ns Τ ∫ i ( )² lower than 30 MHz ADC rate B 2 ADC 0 Energy splitter Digital processing Τ ∫ i ( )² B N ADC 0 Mitsubishi Electric Proprietary - IWCT’05 – June 2005 - Slide 8 Filter Bank
Architecture interests Architecture interests Architecture interests Architecture interests � Relaxed hardware constraints: Relaxed hardware constraints: � – Only coarse synchronization needed � Robust against clock jitter – Energy based processing � Robust against distortion and phase non-linearity (simplified design: antenna, filter, and amplifier) – Use of passive analog devices � Low power consumption � Flexibility: Flexibility: � – Scalable data rates – Radio Resource Management / power control � Possible Frequency Division Multiplexing Mitsubishi Electric Proprietary - IWCT’05 – June 2005 - Slide 9
Presentation progress Presentation progress Presentation progress Presentation progress Outline Outline � Principles and performances Principles and performances � � Transceiver architecture Transceiver architecture � � Transceiver implementation Transceiver implementation � � Conclusion and prospects Conclusion and prospects � Mitsubishi Electric Proprietary - IWCT’05 – June 2005 - Slide 10
Energy splitter (I) Energy splitter (I) Energy splitter (I) Energy splitter (I) Frequency sub-bands division Transceiver based on passive diplexers S ynchro E || R Hybrids & filters Τ ∫ i ( )² 0 B 1 1 2 Numeric Control 3 E nergy 4 P ulse S plitter/C om biner 6 generation S plitter 22 = b 0 11 = Γ ⎡ ⎤ b 0 [ ] T = 1 = ⎢ ⎥ S F b Tja Γ = Γ ⎣ ⎦ 23 11 T b ja 2 14 1 11 B Τ N ∫ i A priori , no external bias field ( )² 0 required S ynchro BUT 2 couplers & 2 filters for the diplexing operation Mitsubishi Electric Proprietary - IWCT’05 – June 2005 - Slide 11
Energy splitter Energy splitter (II) (II) (II) Energy splitter Energy splitter (II) 3.1 - 4.1 GHz frequency sub-bands division based on Lange couplers and band-pass filters Frequency (GHz) 3 P 1 P 1 3.35 - 3.6 3.35 - 3.6 3.35 - 3.6 3.35 – 3.85 3.35 – 3.85 3.35 – 3.85 2.5 3 3.5 4 4.5 P 1 P 2 P 3 P 4 P 1 P 2 P 3 P 4 BP-BS BP-BS BP-BS 4 P 2 P 2 1 3.6 – 3.85 3.6 – 3.85 3.6 – 3.85 S-parameters modulus (dB) 0 3.1- 4.1 3.1- 4.1 3.1- 4.1 BP-BS BP-BS BP-BS 3.1 – 3.35 3.1 – 3.35 3.1 – 3.35 2 P 3 P 3 -10 BP-BS BP-BS BP-BS 3.85 - 4.1 3.85 - 4.1 3.85 - 4.1 3.1 - 3.35 3.1 - 3.35 3.1 - 3.35 5 -20 P 4 P 4 3.85 - 4.1 3.85 - 4.1 3.85 - 4.1 -30 6 couplers & 6 filters (6 BP) -40 -50 -60 Filter Response type Order |S12| |S13| 8 Chebyshev Band-Pass: 3.35 – 3.85 GHz -70 Elliptic 5 Elliptic filters |S14| |S15| 5 Band-Pass: 3.1 – 3.35 GHz, Chebyshev -80 3 3.35 – 3.6 GHz Elliptic • 3 dB bandwidth = 0.23 GHz • Passband ripples < 0.2 dB • Insertion losses < 0.74 dB • Out-of-band rejection > 15 dB Mitsubishi Electric Proprietary - IWCT’05 – June 2005 - Slide 12
Recommend
More recommend
