Presentation is loading. Please wait.

Presentation is loading. Please wait.

CDMA TECHNOLOGY INSTRCTOR: NAZILA SAFAVI. What This Course is All About?

Similar presentations


Presentation on theme: "CDMA TECHNOLOGY INSTRCTOR: NAZILA SAFAVI. What This Course is All About?"— Presentation transcript:

1 CDMA TECHNOLOGY INSTRCTOR: NAZILA SAFAVI

2 What This Course is All About?

3 What is Multiple Access?

4 What is a Channel?

5 Defining Our Terms

6 Spread Spectrum Principles

7 CDMA Spreading Principle: Anything We Can Do, We Can Undo

8 Shipping and Receiving via CDMA

9 CDMA Spreading Principle: Multiple Successive Spreadings are Reversible

10 How Many Spreading Sequences Do We Need? (Discriminating Among Forward Code Channels

11 How Many Spreading Sequences Do We Need? (Discriminating Among Base Station

12 How Many Spreading Sequences Do We Need? (Discriminating Among Reverse Code Channels

13 CDMA Magic Spreading Tool #1: Walsh Codes Note: Example of orthogonality – The coordinates used to describe the position of a mobile station at a certain time: latitude (North or South of the Equator), longitude (East or West of Greenwich), altitude (relative to sea level), and time. A change in any of these magnitudes does not affect the other three, therefore they are orthogonal.

14 Correlation and Orthogonality

15 CDMA Magic Spreading Tool #2: The Short PN Sequences

16 CDMA Magic Spreading Tool #3: The Long PN Sequence (User Long Code)

17 CDMA Code Channels in the Forward Direction

18 Coding Process on CDMA Forward Code Channels MSC

19 CDMA Code Channels in the Reverse Direction

20 Coding Process on CDMA Reverse Code Channels MSC

21 CDMAs Magic Spreading Sequences Summary of Characteristics & Functions

22 Basic Spreading & De-spreading Example: Users Data Spread, Sent, Recovered

23 Spectrum Usage and System Capacity: Signal Bandwidth, Vulnerability, and Frequency Reuse

24 Relationship Between E b /N 0 And S/N

25 CDMA Advantage (13 kb vocoder at full rate)

26 Reverse Link Interference Scenarios

27 CDMA Capacity Considerations

28 Coexistence of CDMA with Other Systems

29 Overlaying CDMA on an AMPS System

30 CDMA 800 MHz Cellular Spectrum Usage

31 OrderSide ASide B The above table is an example of CDMA channel allocation, in chronological order, which allows maximum CDMA channel packing. Note: a) requires frequency coordination with non-cellular interferes b) requires frequency coordination with A-side carrier

32 Deploying CDMA on the 1900 MHz band

33 CDMA PCS 1900 MHz Spectrum Usage

34 BTAs (Basic Trading Areas) are grouped into 51 MTAs (Metropolitan Trading Area s). The following tables are examples of CDMA channel allocation, in chronological order, which allow maximum CDMA channel packing. Each table represents the preferred set of CDMA channels according to J-STD-008. PCS Band A

35 PCS Band B PCS Band C PCS Band D PCS Band E PCS Band F


Download ppt "CDMA TECHNOLOGY INSTRCTOR: NAZILA SAFAVI. What This Course is All About?"

Similar presentations


Ads by Google