June 1, 1999. 1 Morse Code, Semaphore & CD/SS™ Digital Wireless Communication Technology.
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Transcript of June 1, 1999. 1 Morse Code, Semaphore & CD/SS™ Digital Wireless Communication Technology.
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June 1, 1999. 1
Morse Code, Semaphore & CD/SS™
Digital Wireless Communication Technology
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LanwaveTechnology, Inc. © 1999 2
C.E. Shannon’s Model of communication
SourceEncoding Modulation Demodulation DecodingChannel
Noise
Sender Receiver
Transformation usinga Coding Scheme
A Priori Informationon Coding method
•The Shannon Limit: maximum number of bits/sec = W log2(1 + S/N)
Signal in Bits/sec Recover Signal
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LanwaveTechnology, Inc. © 1999 3
Importance of Spectrum Spreading
•Capacity-maximizing Signal density functions Pi(f) over available bandwidth W, as a function of frequency f, is the “filling” of the noise density function N(f), such as the situation under uniform gravity. Total volume of the liquid is proportional to the available transmitter power.
Bandwidth
N(f)P3(f)
P2(f)
P1(f)
W
Shannon’s water filling illustration
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LanwaveTechnology, Inc. © 1999 4
Telegraph & Semaphore..The first form of digital wireless communication
Morse Code:•(26+10+..) alphabet of dots and dashes•typically short, irregular length•low bandwidth requirement•binary amplitude yields a high noise margin, &•high tolerance to phase, time & amplitude jitters•poor error correction capability
Semaphores:•same idea•low bandwidth channel•long range, low cost•many drawbacks
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LanwaveTechnology, Inc. © 1999 5
SATURN Wireless Modem Chip
Telegraphing
Framing
Protocol
Symbol to alphabet (PN) code translation
Recognition Encryption Error control
Network flow control
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LanwaveTechnology, Inc. © 1999 6
Telegraph with Color Filtering What is CD/SS™ ?
..110100110111000111101011000111100010101..
110 011 000 111 101 100 000
* Code Division/Spread Spectrum, or CD/SS is a registered trademark of Lanwave Technology, Inc.
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LanwaveTechnology, Inc. © 1999 7
Lanwave 1-bit DSP CoreBenefits of Code Division Spread Spectrum (CD/SS™)
“Morse Code” modem - 8 symbol alphabet - Alphabet selection optimized by DSP criteria - >10dB processing gain for Part 15 compliance
1-bit DSP allows non-linear RF design- Class C power amplifier - No
automatic gain control - No I-Q mis-matching issues
Simplified timing reference - Independent clocks in each node
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LanwaveTechnology, Inc. © 1999 8
Implementation
Each symbol (alphabet) is assigned a 32-bit color code (8x32chip PN sequence)
Symbol boundary alignment - Search&Lock - programmable thresholds
Color separation - Minimum Hamming distance - parallel processing design
Framing, Error Protection, Encryption - TDD, Parity/BCH, (11,3)MRL Encryptor - programmable
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LanwaveTechnology, Inc. © 1999 9
Bandwidth Efficiency
frequency
t
Direct Sequence Spreading
(DSS)Code Division/Spread Spectrum
(CD/SS™)
1
0
0
111
010
001
green
red
blue
frequency
F(pn)
F(/pn)
** F(pn) is the Discrete Fourier Transform (DFT) of the pseudo random code pn.
Advantage over Direct Sequence Spread Spectrum
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LanwaveTechnology, Inc. © 1999 10
Fast Synchronization
frequency
time
Frequency Hopping Spread Spectrum
(FHSS)Code Division/Spread Spectrum
(CD/SS™)
Advantage over Frequency Hopping Spread Spectrum & FH/TDMA
Sequence Broken
Resync
Black Out
• Long BLACK OUT (seconds) on FCC required FH PN sequences• Dramatically increasing cost, as environment becomes noisy
frequency
Sequence Broken
time
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LanwaveTechnology, Inc. © 1999 11
Code Overlapping
frequency
Code Division with Multiple Access
(CDMA)Synchronous CD/SS™ *
(S-CD/SS™)
frequency
time
• Wide variations in TOA increase DSP complexity, reducing performance• Synchronous CD/SS™ controls code overlap to fractions of chip time
time
Time of Arrival (TOA) varies from the lack of source timingsynchronization
* CD/SS Filtering of Secondary Color Code (mix of Primary Color).** Technology in next generation Lanwave CD/SS™ processors only.
Advantages over traditional CDMA
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LanwaveTechnology, Inc. © 1999 12
Framing for Flexible Protocol Data Encapsulation, Encryption, Error and Flow Control
Preamble: 18 symbols of “000”. 54 bit time.
UID/UST field 18 symbols (Fully encrypted)UID: User definable ID field - 24 bit time. 22-bit user programmable.UST: Command & Status. 24-bit (3 bytes) per frame.CRC: 6-bit Error detection code for the UID/UST subframe.
Subframes: 18 encrypted symbolsData: 48 bits CRC: 6-bit
Preamble UID & UST Subframe 1 Subframe 4Subframe 2 Subframe 3
110 011 000 111 101 100 000..
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LanwaveTechnology, Inc. © 1999 13
Optimized for Voice TransmissionTime Division Duplexing & Minimizing Acoustic Echo
Transmit Frame
Transmit FrameReceive Frame
Receive Frame
3ms
6ms
handset receiver output
telco line signal
Transmit Frame
Receive FrameBase Unit
Handset
Voice transmission delay = Receive frame (6 subframes) + G1 + G2 + Transmit preamble & control (2 subframes)= 4.313 ms
G1 G2
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LanwaveTechnology, Inc. © 1999 14
Telephone Benefits
Multiple handsets Audio Noise Reduction Frequency & Space Diversity Advanced Power Management Configurable Networking Architecture Timers, CPU Clock Gen, Wakeup Monitor
allowable by the SATURN chip architecture
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LanwaveTechnology, Inc. © 1999 15
Multiple Client Protocol
Subgroups
Star, Bus, Point-to-point, Point-to-multi point, Any-to-any hail (Page Mode)
IndividualizedExtensions
Intercom
Base-line access,with 3-way conference
Paging
Ad-hocnetworking
Intercominitiation.. hail
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LanwaveTechnology, Inc. © 1999 16
Circuit and Packet ConnectionsRJ-11 to PSTN with PCM to E1/T1, or RJ-45 to Internet with Voice over TCP/IP
Huh ? ..CSMA, isochronous, GAP-II, DECT, xDSL, I-Node, A-Node, U-plane, NDIS, SWAP, TAPI, 802.11, NWK, DLC, Q.931, TDMA, ISDN, ATM..
It simply means..
..your phone is now Internet friendly.
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LanwaveTechnology, Inc. © 1999 17
Diversity Antennato counteract indoor Multipath Fading (Lanwave Technical note AN-7)
Fading results from reflection off walls, forming peaks and valleys from EM wave superimposition
Time, Space and Frequency varying, mobility dependent, forms non-stationary random processes
Calculation units provided in SATURN simplified antenna selection allowing for 4-bit MCU implementation.
Hardware synchronized switching control
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LanwaveTechnology, Inc. © 1999 18
Hybrid Hopping
Avoid frequency selective noise sources such as other cordless phones, microwave oven, home network
Smart hopping (with a-priori knowledge) using SATURN hardware assistance, PLL channel selection by MCU
With FCC 15.247 spreading requirement met, simplified hopping by using deterministic sequence, reducing resynchronization delay from jamming
Simple algorithm suitable for 4-bit MCU
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LanwaveTechnology, Inc. © 1999 19
Advanced Noise Reduction
QuietcodeSticky CounterSearch & LockDual AntennaDistance SensingPower ControlConjugate FrequencySmart Channel SearchHybrid Hopping
Hardware
XXX
XX
SoftwareXXXXXXXXXXXXXXXXXXXXXXXX
PerceptionXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
For detail see Lanwave Technical note AN-5, AN-6
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LanwaveTechnology, Inc. © 1999 20
Typical Cordless Telephones
CPU4-bit
ReceiverMic46/49MHz
Single chipCT controller
CPU4-bit
ReceiverMic
LCD
SATURNL9002VX
CODECRF
circuit
battery mgmt
46/49/900MHzAnalog
900MHz/2.4GHzDigital Phone
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LanwaveTechnology, Inc. © 1999 21
Observations
Digital design is a science, RF is an art. Analog problem sticks over time.. Loops cost money, gates are free (almost).
Over doing DSP hurts power Use link layer DSP for noise control “Its the multipath, stupid!” Testing dominate silicon cost
eventually
Wireless System Design for Consumer Electronics
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LanwaveTechnology, Inc. © 1999 22
This Picture Contains a “$” Sign
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LanwaveTechnology, Inc. © 1999 23
Filtering of your eyethe Digital Filtering of Color, is CD/SS™ Technology
Do you see the “$” sign?
there is an “S”in yellow, an “N” in light gray. When viewing under a pure red filter, the blue and green turns to black, to review an arrow pointing NE at the one o’clock direction forming “$”.
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LanwaveTechnology, Inc. © 1999 24
Lanwave Technology, Inc.Your Wireless Connection
Contact Lanwave (USA) for detailsTel: (408)-253-3883, Fax: (408)-253-6630
Local (Asia) representatives Japan distribution: Sanshin Electronics
Tel: (81)-3-54847380
Taiwan: Tonsam CorporationTel: (886)-2-2651-0011, Fax: (886)-2-
2651-0033Hong Kong & China:
Dynax Telecom Ltd. Tel: (852)-2481-0223, Fax: (852)-2481-0826