Telecommunications – Transmitter and receiver at separate stations – Plural transmitters or receivers
Reexamination Certificate
2002-12-19
2004-11-30
Tran, Pablo N. (Department: 2685)
Telecommunications
Transmitter and receiver at separate stations
Plural transmitters or receivers
C455S450000, C455S464000, C455S509000, C370S335000, C370S336000
Reexamination Certificate
active
06826411
ABSTRACT:
BACKGROUND
This invention generally relates to wireless hybrid time division multiple access/code division multiple access communication systems. More particularly, the present invention relates to measuring interference signal code power in such systems.
A measurement commonly used in hybrid time division multiple access (TDMA)/code division multiple access (CDMA), such as time division duplex (TDD)/CDMA or time division synchronous code division multiple access (TD-SCDMA) wireless communication systems is interference signal code power (ISCP). ISCP is a measure of the interference in a particular time slot. This measurement has many applications, such as for time slot and channel assignments for the system's users.
FIG. 1
is a simplified diagram of an ISCP measuring device of a radio frequency (RF) receiver
30
. To allow the automatic gain control (AGC)
12
to settle, the AGC
12
is turned on slightly prior to the midamble portion of a communication burst. This time period is typically
50
chips prior to the midamble. The midamble is the portion of a communication burst containing known training sequences.
The midamble is received by an antenna
10
or antenna array. The AGC
12
normalizes the power level of the received RF signals. A sampling device
14
samples the received signals at the chip rate or a multiple of the chip rate. A midamble processing device
16
processes the received signals with a code associated with the receiver's midamble code(s). Using information from the midamble processing and the control value of the AGC
12
(representing the AGC gain), an ISCP calculation device
18
determines the ISCP measurement.
A drawback to measuring the ISCP in this manner is the processing power required. The midamble processing and the ISCP calculation require considerable processing power and receiver on time. By reducing the processing power and receiver on time, power usage for a user equipment is reduced and, accordingly, battery power consumption is reduced. The reduced battery power consumption extends the battery life of the user equipment.
Accordingly, it is desirable to have other approaches to calculating ISCP.
SUMMARY
An interference signal code power (ISCP) measurement is estimated in a time division multiple access/code division multiple access communication system. Signals transmitted in a particular time slot are received. A power level of the transmitted received signals of the particular time slot is measured. An association of ISCP values with measured power levels is provided. The measured power level is used to estimate an ISCP value. The estimated ISCP value is associated with that measured power level.
REFERENCES:
patent: 6333920 (2001-12-01), Nguyen et al.
patent: 6546252 (2003-04-01), Jetzek et al.
patent: 6591109 (2003-07-01), Pan
patent: 6704286 (2004-03-01), Zeira et al.
patent: 6714523 (2004-03-01), Zeira et al.
patent: 2002/0015393 (2002-02-01), Pan et al.
patent: 2002/0031105 (2002-03-01), Zeira et al.
patent: 2002/0181550 (2002-12-01), Zeira et al.
patent: 2003/0086380 (2003-05-01), Kim et al.
patent: 2003/0086394 (2003-05-01), Zeira et al.
patent: 1329789 (2002-10-01), None
patent: 1176730 (2002-01-01), None
patent: 2003032168 (2003-01-01), None
patent: WO02093757 (2002-11-01), None
Dick Stephen G.
Levy Joseph S.
Rudolf Marian
InterDigital Technology Corporation
Tran Pablo N.
Volpe and Koenig P.C.
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