Downlink and uplink transmitting method for realizing MIMO
A multi-output, multi-input technology, applied in the field of communication, can solve the problems that the number of antennas cannot be too large, the offsets of spreading codes and training sequences are different, and the channel orthogonality becomes poor.
Inactive Publication Date: 2006-09-06
ZTE CORP
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Problems solved by technology
The system described in this patent transmits different data on the multi-antennas of uplink and downlink. Such a system has the following two disadvantages when used in TD-SCDMA: 1) Since the data transmitted on the multi-antennas is different, different antennas for a certain user use The spreading codes and training sequence offsets must be different, so that the number of antennas cannot be too large in a multi-user environment and limited codeword resources
In the TD-SCDMA system, since the spreading gain is relatively small, it is hoped that the number of base station antennas is relatively large to make up for the lack of anti-interference capability
Therefore, the above patent limits the number of base station antennas, which reduces the anti-interference ability and system performance; 2) different data are transmitted on multiple antennas, and the capacity is expanded under the condition that the channels between antennas are orthogonal. However, when the environment changes When is large, the channel orthogonality becomes worse, and the performance will be greatly deteriorated at this time
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[0032] In the TD-SCDMA system, there are four stages including uplink transmission, uplink reception, downlink transmission, and downlink reception. The downlink transmission method and the uplink transmission method for realizing MIMO in the present invention will be further described in detail below in combination with uplink reception and downlink reception.
[0033] Such as figure 1 As shown, the uplink transmission of the present invention in the TD-SCDMA system comprises the following steps:
[0034] The UE (user) side generates user symbol data (101);
[0035] The same symbol data is divided into Ku road, each road signal adopts the complex code of different spreading code and scrambling code to carry out spreading (102);
[0036] After frequency spreading, the signals of each channel are respectively combined with different training sequences into burst data (103);
[0037] The burst data of each channel is transmitted by the corresponding antenna.
[0038] The spe...
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The present invention discloses a multiple input / output down and uplink transmitting method for solving the problem of aerial numbers restricted by user environment and code word resource. Said invented multiple input / output down transmitting method divides same symbol data into channel number same with base station side aerial number, each channel signal adopting same spread spectrum code and scrambling code compound code to proceed spread spectrum, and adopting same training sequence; said invented uplink transmitting method dividing same symbol data into channel number same with user side aerial number, each channel signal adopting same spread spectrum code and scrambling code compound code to proceed spread spectrum, and adopting same training sequence. Aerial number does not limited by resource if adopting above-mentioned method, said invention can raise interference-resisting ability and reduce power amplifying requirement.
Description
technical field [0001] The invention relates to the technical field of communication, in particular to a downlink transmission method and an uplink transmission method for realizing multiple input and multiple output. Background technique [0002] In a wireless mobile communication system, a Multiple Input Multiple Output (MIMO) system can resist fading caused by multipath, thereby improving system performance, increasing system capacity and extending coverage. In the existing TD-SCDMA system, a multi-antenna system has been implemented on the NodeB side, which can realize uplink receive diversity and downlink transmit shaping. However, since the UE has only one antenna, uplink transmit diversity and downlink receive diversity cannot be realized. [0003] In the patent with the publication number CN1540900A, the stage and device of introducing the MIMO system of uplink and downlink open-loop transmission into the TD-SCDMA system are introduced. The system described in this ...
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IPC IPC(8): H04B7/06H04B1/707
CPCY02D30/70
Inventor 江海
Owner ZTE CORP