UWB Hardware Issues, Trends, Challenges, and Successes
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1 UWB Hardware Issues, Trends, Challenges, and Successes Larry Larson Center for Wireless Communications 1
2 UWB Motivation Ultra-Wideband Large bandwidth (3.1GHz-1.6GHz) Power spectrum density limited: dbm/mhz Many narrow-band interferers 5GHz UNII band (82.11a, cordless telephones) Airport and Marine Radars WiMAX Signal generation: Impulse (Gaussian Monopulse), DSSS, OFDM, Spectral Encoding, etc. 2
3 Long Run Threat to Wide Adoption of UWB is Interference Roughly -4 dbm/mhz! Radars, Comm. Systems, Military, etc., etc. 3
4 Long Run Threat to Wide Adoption of UWB is Interference 4
5 UWB Time Hopping Signals UWB TH Signal defined as: st () = an ( ) pt ( nt tpn ( n) tdn d ( )) T t t d pn n - frame length p( t) - pulse - time offset a( n), d( n) - data bits - pseudo-random time offset (a) UWB TH-BPSK 1 (b) T 2T UWB TH-PPM 5
6 Look Ahead Block Inversion S ( f ) f H c ( f ) 2 () i f Goal: Determine the set of flag bit polarities that minimizes the power out of the complementary filter Minimizes power transmitted in the notch r Jr () = RISi () i= 6
7 Example of LABI PI Spectral Shaping -5-5 Power (db) ~18dB Power (db) ~1dB Frequency (GHz) 1MHz notch at 3GHz Frequency (GHz) 5MHz notch at 3GHz Smaller blocks lengths and longer filters improve performance 7
8 UWB Spectral Encoding Source: C. da Silva, L. Milstein. Spectral-Encoded UWB Communication Systems: Real-Time Implementation and Interference Suppression, Trans. Comm., vol. 53, pp , Aug
9 1 DAC: Spectral Encoded Waveform Spectral Encoding Block DAC Differential Output (V) x Time (ns) Power (db) Frequency (GHz) Power (db) Frequency (GHz)
10 Multi-Band OFDM Ultra-Wideband Systems - II Band Band Band Band Band Band Band Band Band Group 1 Group 2 Group 3 F ( GHz ) 1
11 Narrow Band Jammers Receivers have a non-linear transfer function y() t = c x() t + c x() t + c x() t A wideband spur at the input to the receiver spreads a narrow band jammer to twice its bandwidth due to the 3 rd order nonlinearity, reducing the SNR Need to quantify this cross-modulation product to correctly specify the receiver 11
12 Effect of Cross-Modulation on Received SNR Calculate noise at the output of receiver from just the LNA and mixer Add in-band noise power to this noise to calculate new SNR 1 5 Link Margin (db) -5 PTX = -4 dbm PTX = -35 dbm PTX = -3 dbm IIP3 (dbm) Pj = -3 dbm 12
13 Wideband Distortion SNR at receiver output drops in the presence of 2 or more signals Need to quantify this SNR reduction to accurately specify receiver 13
14 2 nd Order Intermodulation PSD It can be shown that the PSD of the 2 nd order intermodulation product is given by T T T PSD( ω) = c A A sin c(( ω+ ω + ω +Δ ω( m + n)) ) + sin c(( ω ω ω Δ ω( m + n)) ) Ns Ns sym 2 2 sym sym 2 tx1 tx2 Ns Ns Pintermod(dBm/4MHz) Calculated Simulated Link Margin (db) PTX=-4 PTX=-35 PTX= Freq(Hz) Comparison of simulated and calculated 2 nd order inter-modulation power spectral density IIP2 (dbm) Link budget degradation in the presence of distortion 14
15 Issues With Standard Receiver Designs Suited for narrow band signals Consume a lot of die area Susceptible to interference Industry focus Time to market critical, no time to innovate or take risks Use a standard design approach and run with it Academia Take one step back and re-visit current design techniques. Are they suitable for a radically new system like MB-OFDM UWB? Answer above question with a new innovative solution 15
16 Tunable LNA - I 2 15 Group 1 Group 3 Gain (db) 1 Group Freq (GHz) Take advantage of frequency hop nature of MB-OFDM signal Dynamically tune LNA to desired frequency: Pseudo UWB LNA 16
17 Measurement Results - I Gain (db) Band 1 Band 2 Band 3 Band 4 Band 5 Band 6 Band 7 Band 8 Band 9 Noise Figure (db) Noise Figure (db) Input IP Input IP3 (dbm) RF Frequency (GHz) Receiver Gain: 3-8 GHz Gain variation over bands 6 db Not very significant since received power will vary more than this over bands Band Number Noise Figure: 5 to 6.5 db Input IIP3: -2.5 to -6 dbm 17
18 UWB Receiver Die Micrograph.18 µm CMOS.35 mm ma Current Consumption 2.64 GHz IF NO on-chip inductors 18
19 Conclusions UWB Systems will be widely adopted if they are very low cost (highly integrated with small die area) and consume little dc power are robust against interference across the entire UWB band 19
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