Abstract
Massive MIMO or Large Scale MIMO is a promising solution for achieving superior data rates in 5G communication systems. However it has limitation in term of scalability and coverage for users that has highly spatial separation. Distributed massive MIMO is expected to enhance these drawbacks. One main problem arises in this scheme is the MIMO interference channel conditon that can be coped by interference alignment algorithm. The main consideration for interference alignment algorithm in distributed Massive MIMO is to achieve low complexity precoding to eliminate interference channel condition and to design efficient hardware architecture for its implementation. Previous research regarding IA for Distributed Massive MIMO indicates that the complexity issues is still not widely discussed. This paper proposed the low complexity IA scheme for large scale MIMO system based on limited interferer and the implementation of low cost interference alignment and wireless synchronization for distributed MIMO using software defined radio hardware. From the simulation result it is shown that limited interferer IA algorithm achieve acceptable BER performance, i.e. in order of 10-3. The hardware implementation of the IA precoding matrix computation is also discussed and base on the experiment it is show that the proposed algorithm and architecture achieved higher hardware performance compared to the linear IA.
Highlights
Delivering superior data rates without sacrifying the quality of service is the key task for the wireless communication business
There are two main key consideration required for Distributed Massive MIMO with Interference Alignment (IA) realization, i.e. how to provide low complexity precoding to cope interference channel
We present the limited interferer based Interference Alignment algorithm and its precoding matrix system architecture and implementation for large scale distributed MIMO
Summary
Delivering superior data rates without sacrifying the quality of service is the key task for the wireless communication business. Massive MIMO has limitation in term of scalability and spatial diversity or coverage for highly spread user. To enhance these drawbacks distributed Massive MIMO possibly will be a supreme way out. There are two main key consideration required for Distributed Massive MIMO with Interference Alignment (IA) realization, i.e. how to provide low complexity precoding to cope interference channel. This paper will propose the low complexity IA scheme for large scale MIMO system based on limited interferer. [16] proposed large scale system precoding algorithm by continually optimize receiving and transmitting precoding vectors iteratively based on Interference Alignment criterion and achieve significant performance gains. Despite its high performance result, this algorithm has not addressed high complexity issue which raise substantial obstacle in hardware implementation process
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