FIELD: radio engineering, communication.
SUBSTANCE: pilot transmission schemes may utilise frequency, time, or both frequency and time orthogonality to achieve orthogonality between pilots transmitted by multiple base stations on a downlink. Frequency orthogonality is achieved by transmitting pilots in non-overlapping sets of subbands. Time orthogonality is achieved by transmitting pilots using different orthogonal codes (e.g., Walsh codes). The pilots may also be scrambled with different scrambling codes, which are used to randomise pilot interference and to enable identification of the transmitters of said pilots. Pilot interference cancellation may be performed to improve performance since subbands used for data transmission by one transmitter may also be used for pilot transmission by another transmitter. Pilot interference is estimated and then subtracted from received symbols to obtain pilot-cancelled symbols having improved quality.
EFFECT: efficient technology for pilot transmission schemes for wireless multi-carrier communication systems.
51 cl, 17 dwg, 4 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| CIRCUITS OF PILOT-SIGNALS TRANSMISSION FOR SYSTEMS OF RADIO COMMUNICATION WITH TRANSMISSION ON SEVERAL CARRIERS | 2004 |
|
RU2368088C2 |
| SPACE-DIVISION MULTIPLE ACCESS (SDMA) FOR WIDEBAND CODE DIVISION MULTIPLE ACCESS (WCDMA) | 2006 |
|
RU2414074C2 |
| TRANSFER OF PILOT-SIGNAL SYMBOLS IN SYSTEMS OF WIRELESS COMMUNICATION | 2006 |
|
RU2405256C2 |
| MODULATING SYSTEM WITH PLURALTY OF CARRIERS WITH CYCLIC DELAYS DIVERSITY | 2005 |
|
RU2369030C2 |
| TRANSMISSION OF PILOT SIGNALS VIA RETURN COMMUNICATION LINE FOR WIRELESS COMMUNICATION SYSTEM | 2007 |
|
RU2407180C2 |
| FRAME STRUCTURES FOR WIRELESS COMMUNICATION SYSTEM WITH MULTIPLE RADIO COMMUNICATION METHODS | 2005 |
|
RU2386217C2 |
| TRANSMISSION OF PILOT SIGNAL FOR WIRELESS COMMUNICATION SYSTEM WITH ORTHOGONAL FREQUENCY DIVISION OF CHANNELS | 2006 |
|
RU2370902C2 |
| PILOT SIGNALS OF DETECTION FOR WIRELESS COMMUNICATION SYSTEMS | 2007 |
|
RU2419204C2 |
| RECEPTION OF H-ARQ TRANSFERS WITHOUT NOISE IN QUASI-ORTHOGONAL COMMUNICATION SYSTEM | 2006 |
|
RU2390969C2 |
| MULTIPLEXING IN ORTHOGONAL UPLINK IN MULTI-CARRIER CODE DIVISION MULTIPLE ACCESS SYSTEMS | 2005 |
|
RU2384945C2 |
