Bit allocation method for mimo-ofdm system based on delayed channel state information

Abstract

The invention provides an MIMO-OFDM (Multiple Input Multiple Output-Orthogonal Frequency Division Multiplexing) system bit distribution method based on delay channel state information. The MIMO-OFDM system bit distribution method comprises the following steps: estimating a current actual channel according to delayed channel state information; calculating constellation distance parameter of space sub-channels; dividing all the space sub-channels into two groups and determining the distribution of two groups of distributed bit numbers; distributing each group of bit distribution parameters; and calculating the distributed bit numbers and corresponding emission power of each space sub-channel in the groups. The MIMO-OFDM system bit distribution method based on the delay channel state information has the beneficial effects that the total emission power is reduced; the complexity of bit loading in a communication system is reduced; and CSI mismatch and reduction of algorithm performances, caused by delaying, are avoided.

Description

technical field [0001] The invention relates to a wireless communication system resource allocation technology, in particular to a bit allocation method based on delayed channel state information for the physical layer of the MIMO-OFDM system. Background technique [0002] Various wireless communication systems such as cellular mobile communication networks, wireless local area networks and metropolitan area networks are developing rapidly, but they are also facing various challenges. The contradiction between the continuous improvement of the wireless channel and the limited transmission capacity of the wireless channel. The growth of data services and multimedia services makes this contradiction more prominent. However, the wireless channel is a time-varying fading channel, and it is band-limited, and its capacity is limited and random. Faced with the diversification of services and the trend of users' increasing service quality requirements, it is necessary to maximize ...

AI Technical Summary

Problems solved by technology

The traditional bit allocation method directly uses the channel state information obtained through feedback for adaptive transmission, without considering the delay caused by receiver channel estimation, feedback, etc., which often leads to feedback channel information and actual channel information in time-varying fading channels. Mismatch between states, resulting in transmission errors and performance loss

On the other hand, many traditional bit allocation methods are very complex. Although they have achieved excellent performance, they are difficult to implement in real-time communication systems, and the hardware and software costs are also high.

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