Radio base station and method of controlling radio communications
First Claim
1. A radio base station comprising:
- a channel estimator configured to perform channel estimation of an uplink time slot;
a transmit diversity controller configured to control transmit diversity used for each downlink time slot based on said channel estimation and the number of users sharing the downlink time slot when using a code division multiple system; and
a data transmitter configured to transmit data in said downlink time slot using said controlled transmit diversity.
1 Assignment
0 Petitions
Accused Products
Abstract
The present invention provides a radio base station using the conventional downlink transmit diversity which can compensate for the degradation of transmission quality even when a plurality of users (mobile terminals) share a single time slot using a code division multiple system. The radio base station includes a channel estimator 16 for performing channel estimation of an uplink time slot; a transmit diversity controller 141 to 14N for controlling the transmit diversity used for downlink time slots DL#1 to DL#N based on said channel estimation and the number of users sharing the downlink time slot when using a code division multiple system; a data transmitter 15 for transmitting data via downlink time slots DL#1 to DL#N using the controlled transmit diversity.
53 Citations
8 Claims
-
1. A radio base station comprising:
-
a channel estimator configured to perform channel estimation of an uplink time slot;
a transmit diversity controller configured to control transmit diversity used for each downlink time slot based on said channel estimation and the number of users sharing the downlink time slot when using a code division multiple system; and
a data transmitter configured to transmit data in said downlink time slot using said controlled transmit diversity. - View Dependent Claims (2, 3, 4, 6, 7, 8)
-
-
5. A method of controlling radio communications, comprising the steps of:
-
a) performing, at a radio base station, channel estimation of an uplink time slot;
b) controlling, at said radio base station, transmit diversity used for each downlink time slot based on said channel estimation and the number of users sharing the downlink time slot when using a code division multiple system; and
c) transmitting, at said radio base station, data in said downlink time slot using said controlled transmit diversity.
-
Specification