Frequency selection method and communication method for wireless communication system

Abstract

The invention discloses a frequency selection method and communication method for a wireless communication system. The communication method comprises the steps that a base station searches a center frequency of a working channel in a working band and transmits synchronizing signals according to the center frequency; terminals receive the synchronizing signals, finish synchronizing frequencies andobtain the center frequency of the working channel of the base station and synchronizing signal receiving powers; and the terminals select subchannel center frequencies to transmit uplink signals through utilization of synchronizing signal power values, thereby communicating with the base station. The smaller the synchronizing signal powers are, the terminals select the frequencies closer to the center frequency of the synchronizing signals as the subchannel center frequencies, and on the contrary, the terminals select the frequencies away from the center frequency of the synchronizing signalsas the subchannel center frequencies. According to the frequency selection method and the communication method, a base station working channel bandwidth is divided into a plurality of spectrum partitions, the terminals select the subchannel center frequencies to transmit the uplink signals according to signal strength, the signals with different strength can be isolated on frequency allocation, weak signals are effectively prevented from being interfered by strong signals, and channel capacity is improved.

Description

technical field [0001] The invention belongs to the field of wireless communication, and relates to the selection of the center frequency of the working channel by the base station and the selection of the carrier frequency by the terminal during the wireless communication process between a terminal and a base station, and specifically relates to a frequency selection method and a communication method of a wireless communication system . Background technique [0002] In the field of wireless communication, due to the influence of the wireless environment, there is interference on the wireless spectrum. In order to ensure the communication quality between the terminal and the base station, it is necessary to avoid these interferences during the communication between the terminal and the base station. In the actual situation, during the communication process between the terminal and the base station, each terminal has a different distance from the base station, the strength of...

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Problems solved by technology

In the FDMA (Frequency Division Multiple Access) system, when different signals arrive at the base station, due to the non-ideality of the radio frequency circuit, the image generated by the signal with high signal power received by the base station is also relatively strong. If the base station receives another The signal power of a terminal is relatively small, and the frequency point on the frequency spectrum is relatively close to the image generated by the signal with high signal power received by the base station, such as figure 1 As shown, then the image of the strong signal will cause interference to the weak signal, which will also affect the choice of carrier frequency

Existing cognitive radio and dynamic spectrum access technologies only consider the existence of interference on the wireless spectrum, but do not consider the distance from the terminal to the base station, the strength of the signal arriving at the base station, the anti-interference ability, and the effect of the image of a strong signal on a weak signal. influence the needs of these

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