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Resource allocation method of the multi-user MIMO-OFDM system of the QoS

A MIMO-OFDM, quality of service technology, applied in diversity/multi-antenna systems, space transmit diversity, communication between multiple stations, etc., can solve the problem of insufficient use of space channel resources, system performance needs to be improved, signal-to-noise big difference

Inactive Publication Date: 2007-08-15
BEIJING UNIV OF POSTS & TELECOMM
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AI Technical Summary

Problems solved by technology

Most resource allocation strategies only use the largest one or two characteristic sub-channels to send signals, which cannot make full use of spatial channel resources
Therefore, some schemes propose to use all sub-channels to transmit data, but the power is evenly allocated. Since the signal-to-noise ratio of each sub-channel is quite different, the system performance of the average power allocation needs to be improved.

Method used

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  • Resource allocation method of the multi-user MIMO-OFDM system of the QoS
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Embodiment Construction

[0035] There are N sub-bands in the system, and each sub-band is composed of R adjacent sub-carriers as a minimum frequency allocation unit, thereby reducing the amount of user feedback information. The minimum time unit for scheduling is a slot (slot), which consists of a fixed number of OFDM symbols, and it is assumed that the channel is quasi-static in a single slot. In each time slot, the user feeds back the channel response H to the base station. The number of transmitting antennas on the base station side is Nt, there are K users in the system, and each user has Nr receiving antennas.

[0036] The scheduler of the base station classifies the arriving packets according to the user ID (Identification) of the arriving packets at the upper layer, and stores them in FIFO (First-in, First-out) queues corresponding to each user, assuming that these queues are infinitely long. Considering the real-time business here, the scheduler records the arrival time of the business packet...

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Abstract

The disclosed resource allocation method for ensuring QoS in MIMO-OFDM system comprises: BS of MIMO- OFDM system takes SVD decomposition to user-feedback channel matrix to obtain parallel feature sub-channel; from every sub-band; on condition BS total power allocated evenly, the BS scheduler allocates some sub-band to user according to user support speed and PRI, then re-allocates power on all feature sub-channels, loads allocated power and bits according to greedy algorithm till loading complete, and taking out the residual sub-band and power to reallocate to others.

Description

technical field [0001] The invention relates to a MIMO-OFDM system scheduling method, in particular to a resource allocation method of a quality-of-service guaranteed multi-user multiple-input multiple-output-orthogonal frequency division multiplexing MIMO-OFDM system. Background technique [0002] With the maturity of the 3G standard, people gradually focus on the research on the future wireless communication system. The future mobile communication system is a human-centered system to meet the individual needs of people, aiming at different business needs and environments, so that anyone can truly communicate freely in any business at any time and any place . [0003] With the continuous improvement of system transmission rate, there are two most serious challenges: multipath fading channel and bandwidth efficiency. Orthogonal Frequency Division Multiplexing (OFDM) technology reduces the impact of multipath fading by converting frequency-selective channels into flat chann...

Claims

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Application Information

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IPC IPC(8): H04B7/04H04Q7/38H04B7/26
Inventor 田辉张平王爽赵澍邓钢张铭
Owner BEIJING UNIV OF POSTS & TELECOMM
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