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Alternating frequency time-sharing duplex communication method

A communication method and carrier frequency technology, applied in the directions of duplex signal operation, time division multiplexing, wireless communication, etc., can solve the problems of unsuitable uplink and downlink communication, etc. effect achieved

Active Publication Date: 2010-07-07
DOCOMO BEIJING COMM LAB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Reference (E.Costa et.al., "Duplex arrangements for future broadband radiointerfaces", WINNER-public deliverables, D2.5, 2004) discloses a communication duplex method, but it uses a fixed frequency bandwidth , not suitable for asymmetric uplink and downlink communication

Method used

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  • Alternating frequency time-sharing duplex communication method
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  • Alternating frequency time-sharing duplex communication method

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Experimental program
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Embodiment 1

[0026] image 3 It shows the duplex communication method of alternating frequency and time division provided by the present invention. like image 3 As shown, the system simultaneously performs uplink and downlink transmission on carrier frequencies f1 and f2 and on time slots of the same time slot length. All time slots (the first time slot, the second time slot, etc.) have the same length, and when the uplink and downlink transmission starts, the length of the time slot is determined by the system and assigned to the same carrier frequency f1 and f2 bandwidth. (It is worth noting that the lengths of all slots may also be unequal to each other.)

[0027] The communication process is: for the carrier frequency f1, starting from the initial timing t0, the system first performs downlink transmission on the first time slot, then performs uplink transmission on the second time slot, and then repeats it on the subsequent time slots Downlink and uplink transmission.

[0028] Fo...

Embodiment 2

[0032] Figure 4 It shows the duplex communication method of alternating frequency and time division provided by the present invention. like Figure 4 As shown, the system simultaneously performs uplink and downlink transmission on carrier frequencies f1 and f2 and on time slots of different time slot lengths. The first time slot, the second time slot, etc. have different lengths respectively, the bandwidth w1 is specified for the carrier f1, and the bandwidth w2 is specified for the carrier f2, w1>w2. And when the uplink and downlink transmission starts, the system determines the length and bandwidth w1 and w2 of the time slot. (It is worth noting that the lengths of all slots may also be equal to each other.)

[0033] In this case, for multi-carrier transmission, the uplink and downlink can adapt the signals in different time slots to different bandwidths through spreading with variable spreading factors. For channel estimation, the number and distribution / multiplexing o...

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Abstract

This invention provides one communication method, which is characterized by the following: at first and second load frequency and same time lag for upper and down transmission; the communication process is as: for first load frequency from start point ad processing upper transmission at first time lag and then for upper transmission at second time lag and then repeating upper and down transmission on time lag; for second load frequency from initial point, processing upper transmission at first time lae and processing down transmission at second time lag and then repeating upper and down transmission at back time lag.

Description

technical field [0001] The present invention relates to a duplex communication method, in particular to an Alternating Frequency Time Division duplex communication method (AFTDD) for an adaptive MIMO wireless system with asymmetric links. Background technique [0002] The trend in recent years is that an adaptive MIMO (Multiple-Input Multiple-Output) system uses multiple antennas to suppress channel fading. It can be seen that the channel capacity increases linearly with the increase in the number of antennas. That is to say, the adaptive MIMO channel can be used to double the wireless channel capacity, and the spectrum utilization can also be doubled without increasing the bandwidth and antenna transmission power. At the same time, the use of adaptive MIMO technology can also improve the reliability of the channel and reduce the bit error rate. The former utilizes the spatial multiplexing gain provided by the adaptive MIMO channel, and the latter utilizes the spatial diver...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L5/14H04L5/26H04W16/28H04W72/04
Inventor 张战加山英俊陈岚
Owner DOCOMO BEIJING COMM LAB